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1. 89 Rectangles ane 89 E E e MING EE 90 ohm M 90 Topological structuring layers A 91 Seamless data Ree eterne nete p hn ene nie RUNS ANNA RIN WYNN na REN GNGAWAY BRAS ARAN RR FERRE ORA NY ERR Y 91 leen GET 91 intersecting polygon boundaries Ynn ALLA ALL LLY ALL nennen nennen ener nenne 92 Change only update COU unisini UD YR RYN EE YU DFTN AEF SEE 93 What Ce ER 93 GUERTING 93 leie K i C OW EE 93 GML TT A LE 94 cC Me GN LE EY FR FE NE FFY 94 Topography Layer related mtormatton esee emnes 94 Use of examples eiii eie tree Eed deed EES 94 Clarification of terms used in this chanter 94 Sei ge Ee lee EE 94 o Sector LL EEUU 94 Document ty OL EM 95 Query result DODERER 95 RIDE 96 lee EE 96 SMP EE 96 ET EF HF FFEFRYN FF FFF FA FAR FF EE EFA FFF FFF FFF FARF 97 COMPEX E 97 COU EF 98 Ka eu PU 99 Schema overview and Internet location 99 ochemadescriptiOnS ncc tentare a Rae ted uta RA AAG ROED RA Re e RU Ru E ec n RR RO Sd NF Ny A 99 Cartographic stylifig eer ion roe reta eee eu rto soe ee EES rte er FR 100 Topographic Area T Y 100 Mapping table no or single descriptive ferm 100 Property application logic no or single descripiive em 101 Prope
2. e HEEEHE OS MasterMap Topography Layer technical specification chapter 10 v1 9 12 2010 Crown copyright Page 102 of 142 Property application logic This section defines the overall logic for applying the style The order of the property in the condition list below is the order that it is applied once applied the condition loop is exited If descriptiveGroup Building and then apply buildingOverheadLine physicalPresence Overhead or descriptiveTerm Overhead Construction then apply structureOverheadLine or descriptiveTerm Tunnel Edge then apply defaultUndergroundLine or descriptiveGroup Building then apply buildingLine or descriptiveTerm Mean High Water Springs then apply waterBoldLine or descriptiveTerm Mean Low Water Springs then apply waterDashedLine or descriptiveGroup Inland Water then apply waterLine or descriptiveTerm Narrow Gauge then apply narrowGaugeRailwayAlignmentLine or descriptiveTerm Standard Gauge Track then apply standardGaugeRailLine or descriptiveGroup Landform and then apply landformBoldLine descriptiveTerm Top Of Slope or descriptiveGroup Landform and then apply landformBoldLine descriptiveTerm Top Of Cliff or descriptiveGroup Landform and then apply landformLine d
3. polyline points 1 254 0 316 1 173 0 016 0 809 0 123 0 634 0 010 0 665 0 154 0 814 0 145 1 006 0 470 1 254 0 316 gt lt polyline points 0 690 0 763 0 762 0 731 0 853 0 531 0 697 0 271 0 402 0 341 0 433 0 632 0 690 0 763 gt lt polyline points 0 428 0 069 0 136 0 125 0 266 0 331 0 408 0 381 0 643 0 214 0 541 0 151 0 546 0 017 0 428 0 069 gt lt polyline points 0 147 0 459 0 049 0 547 0 122 0 457 0 245 0 451 0 365 0 290 0 280 0 213 0 079 0 159 0 135 0 283 0 147 0 459 gt lt polyline points 0 658 0 150 0 953 0 220 0 877 0 387 0 758 0 419 0 714 0 518 0 505 0 477 0 480 0 308 0 658 0 150 gt polyline points 0 224 0 698 0 210 0 940 0 047 0 990 0 191 0 892 0 137 0 671 0 029 0 683 0 063 0 624 0 224 0 698 gt lt polyline points 0 336 0 825 0 392 0 881 0 376 1 152 0 131 1 317 0 099 1 161 0 336 0 825 gt lt polyline points 0 521 0 432 0 320 0 480 0 304 0 705 0 463 0 796 0 596 0 619 0 521 0 432 gt lt polyline points 0 345 0 487 0 570 0 575 0 426 0 791 0 243 0 712 0 306 0 653 0 275 0 561 0 345 0 487 gt lt polyline points 0 012 1 409 0 021 1 589 0 049 1 624 0 007 1 696 0 084 1 696 0 187 1 542 0 151 1 405 0 012 1 405 gt lt polyline points 0 203 1 021 0 054 1 084 0 011 1 292 0 145 1 292 0 271 1 226 0 304 1 086 0 203 1 021 gt lt polyline points 0 370 0 090 0 546 0 048 0 550 0 132 0 426 0 220 0 311 0 067 0 370 0 090
4. change only update COU The ability to supply to a customer only those features that have been created or changed since a specified date Change only supply includes a list of the TOIDS of departed features In the OS MasterMap context the selection of changed data will be by change since date that is all change since midnight on the specified date It is not possible to select change since your last update Therefore the customer s system must recognise repeatedly supplied features change since date The date used when reguesting change only update that indicates the date since which change is reguired This will result in the supply of all change in the database since the beginning midnight of that day It is also known as the extraction date chunking chunk The process of breaking up the area of interest into manageable physical unit of supply files for the customer complex feature A feature that is a collection of other features An example could be a feature representing a river composed of many area and line features representing parts of the river Complex features are not currently a part of OS MasterMap contract The agreement that a customer has for access to Ordnance Survey products and services An OS MasterMap contract will be defined for each layer in terms of an area of interest a list of themes where appropriate a time period the number of terminals the data will be used on and a set of terms and conditi
5. gt lt polyline points 0 350 0 850 0 304 0 956 0 363 1 016 0 467 1 028 0 525 0 938 0 480 0 866 0 350 0 850 gt lt polyline points 0 041 1 759 0 097 1 853 0 198 1 835 0 259 1 777 0 212 1 669 0 085 1 691 0 041 1 759 gt lt polyline points 0 742 0 247 0 650 0 283 0 614 0 371 0 622 0 410 0 704 0 414 0 783 0 369 0 805 0 288 0 740 0 247 gt lt polyline points 0 103 1 400 0 198 1 457 0 164 1 569 0 068 1 585 0 031 1 477 0 103 1 4 gt lt polyline points 1 102 0 328 1 206 0 301 1 211 0 186 1 127 0 141 1 059 0 228 1 102 0 328 gt lt polyline points 0 239 1 339 0 246 1 411 0 408 1 386 0 444 1 321 0 316 1 278 0 239 1 339 gt lt polyline points 0 032 1 923 0 009 2 025 0 050 2 109 0 147 2 063 0 139 1 950 gt lt polyline points 0 032 1 919 0 139 1 948 gt 00 HEN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 126 of 142 smallBoulderFillSymbol Style stroke 666666 f1i11 none stroke width 0 087 C3 Geometry polyline points 0 077 0 118 0 055 0 183 0 058 0 25 0 082 0 308 0 085 0 313 0 131 0 362 0 245 0 413 0 341 0 445 0 443 0 45 0 542 0 429 0 632 0 384 0 708 0 316 0 760 0 233 0 779 0 1 0 769 0 036 0 731 0 170 0 667 0 283 0 578 0 386 gt polyline points 0 876 0 41 0 767 0 402 0 417 0 429 0 065 0 412 0 225 0 385 0 516 0 384 0 806 0 41 polyline points
6. 1 7 UR is c e p n meg Im ES BE AM DUCES Ki SE T ETT Ed WYNNE fim dii E D D G T i Wu iid UU WWE li JU i mrrmn HYLL s H Figure 27 using attribution to visualise amount of change This displays the areas where the greatest amount of change is occurring in the landscape Having so many attributes allows this to be done without any additional work to the data itself If a customer s own attributes are added to OS MasterMap Topography Layer then these can also be used as the basis for the styling Having such flexibility to customise the data presents an opportunity to derive additional value from OS MasterMap Topography Layer For example where there is a necessity to have a clear display of what features look like from a real world point of view then styling schemes based on the style guide work well If there is a reguirement to view a customer s own data alongside OS MasterMap Topography Layer the customer could consider toning down or removing colour from the features so that their own data makes more of a contrast and therefore has the bigger visual impact In the example shown in figure 28 below a customer has derived a set of grassed areas coloured and hatched in green which is displayed over OS MasterMap Topography Layer with just the buildings highlighted in grey to give some additional definition to the data and to help viewers of the data orientate themselves w
7. Crown copyright Page 111 of 142 real world object The real thing represented by a feature for instance a building a section of fence the boundary of a wood or a sharp change of gradient For comparison an example of a non real world object would be the line of an administrative boundary seamless database In the OS MasterMap context this refers to a geospatial database in which there is no concept of geographically splitting the data for management purposes All features are complete and there is no underlying tile structure spatial reference system The term used in GML and hence in OS MasterMap specifications for the definition that allows each spatial position to be stated as a tuple The only spatial reference system currently used in OS MasterMap is the British National Grid supply format The file format in which the data is supplied to the customer surface make See make symbology The use of symbols theme A collection of features that form some logical set for example buildings water land In the OS MasterMap context themes are a collection of features that are either similar in nature or are related to specific usage A single feature may be in one or more themes They are designed to allow the easy selection of features They do not form part of the classification of the feature The theme exists purely to facilitate customer data selection tile A self contained rectangular subset of digital data used to
8. font Integer Part of the textRendering complex attribute A value of O 1 2 or 3 that can be used as a basis for determining which font to use when displaying the text For example a user application could associate Verdana with 2 to display all text with a font of 2 in Verdana height Real Part of the textRendering complex attribute The height of CartographicText The height is expressed as the distance on the ground covered by the text in metres heightAboveDatum Real The height of the feature above the Ordnance Datum Newlyn ODN vertical datum in metres Part of the heightAboveDatum complex attribute heightAboveGroundLevel Real Height of the feature above ground level in metres Part of the heightAboveGroundLevel complex attribute make String Where known indicates whether the real world nature of the feature is man made or natural See Attribute values make nonBoundingLine Boolean Indicates that a TopographicLine feature is not on the boundary of a TopographicArea feature orientation Integer The orientation of text or symbol features for cartographic placement and for text forms part of the textRendering complex attribute Given in tenths of a degree anticlockwise from due east 0 3599 physicalLevel Integer This attribute states whether the feature is underground obscured below normal cartographic level at normal cartographic level or o
9. Natural Environment Coniferous Trees Natural naturalEnvironmentFill and Scattered scatteredConiferousTreesPattern Natural Environment Coppice Or Osiers Natural naturalEnvironmentFill and coppicePattern Natural Environment Heath Natural naturalEnvironmentFill and heathPattern Natural Environment Marsh Reeds Or Saltmarsh Natural naturalEnvironmentFill and marshPattern Natural Environment Nonconiferous Trees Natural naturalEnvironmentFill and nonconiferousTreesPattern Natural Environment Nonconiferous Trees Natural naturalEnvironmentFill and Scattered scatteredNonconiferousTreesPattern Natural Environment Orchard Natural naturalEnvironmentFill and orchardPattern Natural Environment Rock Natural naturalEnvironmentFill and rocksPattern Natural Environment Rock Scattered Natural naturalEnvironmentFill and scatteredRocksPattem Natural Environment Rough Grassland Natural naturalEnvironmentFill and roughGrassPattern Natural Environment Scree Natural naturalEnvironmentFill and screePattern Natural Environment Scrub Natural naturalEnvironmentFill and scrubPattern Path Manmade pathFill Path Step Manmade stepFill Rail Manmade railFill Rail Unknown madeSurfaceFill Rail Natural naturalSurfaceFill Road Or Track Manmade roadFill Road Or Track Traffic Calming Manmade roadFill Roadside Manmade madeSurfaceFill OS MasterMap Topography Layer technical specification chapter 10 v1 9 12 2010 Crown copyright Page 100 of 14
10. Water Description Features that contain delimit or relate to real world objects containing water Theme rule descriptiveGroup Tidal Water or Inland Water Examples Areas of inland water edge of water features related cartographic text and flow direction Land Description Man made and natural features that delimit and describe the surface cover other than communication routes and buildings This also includes all features relating to man made and natural slope and cliff All general features are also placed in the land theme Features with a descriptive group of landform are not topologically structured with the other features in the theme This means that landform line features cross other line features without being broken at intersections and landform area features overlap other area features Theme rule descriptiveGroup General Surface General Feature Landform Built Environment Natural Environment or Unclassified Examples Residential land slopes cliffs and types of land cover Rail Description Features related to travel by railway or tramway Currently railway tunnels are not classified as railway and so will be present in the structures theme Theme rule descriptiveGroup Rail Examples Rail alignments permanent way and railway land OS MasterMap Topography Layer technical specification chapter 3 v1 9 12 2010 Crown copyright Page 69 of 142 Roads
11. lt gml LinearRing gt lt gml coordina tes gt 446201 240 108556 040 446203 960 108550 700 446209 310 108553 420 446206 590 108558 760 446201 240 108556 040 gml coordinates gml LinearRing gml outerBoundaryIs gml Polygon lt osgb polygon gt lt osgb TopographicArea gt lt osgb topographicMember gt RN OS MasterMap Topography Layer technical specification annexe B v1 9 12 2010 Crown copyright Page 115 of 142 Annexe C Cartographic style definitions This annexe defines the default styles for the presentation of data within OS MasterMap This specifies the colours fonts symbols and line styles used for visual display and printing of OS MasterMap The styles are defined using the Scalable Vector Graphics SVG syntax Associated with this chapter is an SVG encoding of the styles for display in an SVG viewer that is available from the style and XML examples section of our website See http www w3c org for information on SVG The SVG provided has only been tested with the browser plug in provided by Adobe Chapter 10 Cartographic styling provides the reguired information to apply the styles of this chapter to features Style principles These definitions covers data supplied to customers as part of OS MasterMap by Ordnance Survey The SVG document associated with this chapter is intended only as an aid to developers writing software to meet this specification A style is not provide
12. specification 3 Modified by the addition or removal of an accent Restructured New line feature s have been created from parts of existing feature s Applied to line features where 1 The feature is split into two or more features 2 Two or more features are joined together Attributes Applied to features that have had only attributes changed except those covered by TextChange and Reclassified values S Incomplete The feature is incomplete Identifies an incomplete line feature or an area that Note this is no longer used in current revision process relates to the incomplete feature returning from a revision process Incomplete line features are not used to construct polygons This represents changes to point line and text features and not polygons n many cases a reasonForChange of attributes will be given to a polygon as modifications to the line work of a polygon have resulted in a change to its calculatedAreaValue attribute OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 87 of 142 Chapter7 Geometry and topology Introduction This chapter defines the geometric data types used by the attributes of the OS MasterMap Topography Layer The treatment of features on the boundaries of data supply areas is specified UML diagrams are used to support the data type descriptions Features and spatial data types The following table details the geom
13. tracks and paths Description Features related to transport by vehicles cycles or pedestrians This includes features that are roads made paths or text classified as road track or path related Tracks and unmade paths features are not currently classified as such and so will be available in the land theme Road tunnels are not classified as related to roads and so will be present in the structures theme Roads Metalled communication routes usable by ordinary vehicles that is not those especially adapted for cross country travel Typical examples of metalling include tarmac concrete gravel cinder and must constitute a specific and systematic improvement to allow the passage of vehicles for features to be described as a road Tracks Non metalled communications routes including those utilised by agricultural and other especially adapted vehicles Exposure of underlying subsurface materials through erosion by vehicular traffic and the intermittent application of metalling to features that are predominantly tracks do not constitute a feature that should be described as a road Paths Metalled or non metalled communication routes for use by cyclists or pedestrians Unmade paths are those without metalling and are only captured when they are continuous between identifiable points Theme rule descriptiveGroup Roadside Road Or Track or Path Examples Road section and verges Structures Description Man made con
14. 0 236 0 582 0 398 0 594 0 404 0 604 0 410 616 0 418 0 626 0 424 0 636 0 432 0 644 0 442 0 654 0 452 662 0 46 0 668 0 472 0 676 0 482 0 682 0 494 0 688 0 504 692 0 516 0 696 0 528 0 698 0 552 0 702 0 554 0 704 0 566 704 0 58 0 704 0 592 0 704 0 604 0 702 0 618 0 7 0 63 696 0 642 0 692 0 654 0 688 0 666 0 682 0 678 0 676 0 69 67 0 7 0 662 0 71 0 552 0 842 0 546 0 848 0 54 0 854 532 0 858 0 526 0 864 0 518 0 868 0 512 0 872 0 504 0 874 496 0 878 0 488 0 88 0 48 0 882 0 472 0 884 0 464 0 886 454 0 886 0 446 0 886 0 438 0 886 0 43 0 884 0 422 0 882 414 0 88 0 406 0 878 0 398 0 876 0 39 0 872 0 198 0 812 378 0 6 0 794 0 408 1 046 0 316 1 058 0 31 1 07 0 302 082 0 292 1 094 0 282 1 104 0 272 1 114 0 262 1 122 0 25 13 0 238 1 138 0 226 1 144 0 212 1 15 0 2 1 156 0 186 16 0 172 1 164 0 158 1 166 0 142 1 168 0 128 1 168 0 114 168 0 098 1 166 0 084 1 164 0 07 1 16 0 056 1 158 0 042 152 0 028 1 146 0 014 1 134 0 014 1 118 0 04 1 102 066 1 084 0 09 1 066 0 114 1 046 0 138 1 028 0 156 01 0 172 0 99 0 188 0 968 0 202 0 946 0 216 0 924 228 o OO O i ii H OOOOO OO OOOOO H H ii OO OO roughGrassFillSymbol Style stroke 8689968 fill none stroke width 0 087 THEE Geometry lt polyline points 0 000 0 349 0 000 0 349 gt lt polyline points 0 416 0 422 0 444 0 261 gt lt polyline points 0 416 0 422 0 444 0 261 gt lt polyline points 0 883
15. 0 436 0 935 0 199 gt lt polyline points 0 883 0 436 0 935 0 199 gt lt polyline points 1 342 0 459 1 412 0 096 gt lt polyline points 1 342 0 459 1 412 0 096 gt lt polyline points 1 769 0 492 1 843 0 049 gt lt polyline points 1 769 0 492 1 843 0 049 gt polyline points 2 187 0 633 2 249 0 334 gt lt polyline points 2 187 0 633 2 249 0 334 gt RN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 125 of 142 screeFillSymbol Style stroke R666666 fill none stroke width 0 087 Geometry lt polyline points 1 449 1 302 1 777 0 894 1 582 0 574 1 445 i9 0 628 1 170 0 400 0 895 0 608 0 803 0 734 0 924 1 075 1 449 1 302 polyline points 1 033 1 217 0 841 0 786 1 085 0 544 1 195 0 625 1 497 0 488 1 741 0 89865 1 545 1 136 1 033 1 217 gt lt polyline points 0 273 1 429 0 834 1 207 0 690 0 817 0 460 0 673 0 022 0 867 0 158 1 005 0 104 1 235 0 273 1 429 gt lt polyline points 0 208 1 302 0 039 0 986 0 235 0 768 0 636 0 831 0 844 1 108 0 864 1 296 0 555 1 374 0 392 1 255 0 207 1 302 gt polyline points 0 009 0 716 0 228 0 562 0 315 0 122 0 050 0 053 0 266 0 147 0 199 0 244 0 323 0 492 0 009 0 716 polyline points 0 665 0 616 0 960 0 387 1 008 0 077 0 949 0 078 0 652 0 002 0 579 0 161 0 408 0 206 0 421 0 529 0 667 0 614
16. 0 567 1 292 0 586 1 516 gt lt polyline points 0 489 0 291 0 364 0 768 0 313 1 258 gt lt polyline points 0 752 0 789 0 653 1 009 0 616 1 248 gt foreshoreFillSymbol Style e stroke 0099ff fill HO099ff stroke width 0 087 Geometry circleFillGeometry see Shared symbol geometry heathFillSymbol Style stroke 669966 fill none stroke width 0 087 l Geometry polyline points 1 487 0 75 1 601 0 208 gt polyline points 0 996 0 613 1 121 0 405 gt polyline points 0 499 0 545 0 55 0 695 gt polyline points 0 0 536 0 0 732 gt lt polyline points 0 499 0 545 0 55 0 695 gt polyline points 0 996 0 613 1 121 0 405 gt polyline points 1 487 0 75 1 601 0 208 gt manmadeLandformFillSymbol Style stroke H669966 fill none stroke width 0 087 S Geometry lt polyline points 1 1 25 25 gt marshFillSymbol Style fill none stroke width 0 087 5 5 Geometry lt g style stroke 40099ff polyline points 4 258 0 000 0 452 0 000 gt lt polyline points 4 250 0 000 0 444 0 000 gt lt polyline points 1 318 0 517 1 317 0 517 gt lt g gt lt g style stroke H669966 gt polyline points 0 444 0 000 0 534 1 0 gt lt polyline points 0 452 0 000 0 541 1 0 gt lt polyline points 0 001 0 013 0 001 1 177 gt lt polyline points 0 880 0 000 1 118 0 675 gt lt polyline points 0 873 0 0
17. 119 of 142 Geometry lt polyline points 0 707 0 707 0 0 0 0 0 707 0 707 gt line x1 1 42 yl 0 0 x2 0 0 y2 0 0 gt boundaryMereingChangeSymbol Style Q stroke Hff00ff fill none stroke width 0 087 Geometry circle r 0 625 cx 2 875 cy 0 0 gt line x12 0 0 yl 0 0 x2 2 2 25 y2 0 0 gt boundaryPostSymbol Style O stroke ff00ff fill none stroke width 0 087 Geometry circleGeometry see Shared symbol geometry culvertSymbol Style stroke 0099ff stroke width 0 087 Geometry polyline points 0 5 0 0 5 0 gt flowArrowSymbol Style lt stroke 10099ff fill none stroke width 0 087 Geometry polyline points 0 0 0 0 3 438 0 0 gt polyline points 0 5 0 5 0 0 0 0 0 5 0 5 gt lt polyline points 3 35 0 5 2 85 0 0 3 35 0 5 gt lt polyline points 3 938 0 5 3 438 0 0 3 938 0 5 gt heritageSiteOfSymbol Style stroke 000000 fill none stroke width 0 087 Geometry polyline points 2 25 0 0 2 25 0 gt polyline points 0 0 2 25 0 0 2 25 circle r 0 625 cx 0 cy 2 875 gt circle r 0 625 cx 0 cy 2 875 gt circle r 0 625 cx 2 875 cy 0 gt circle r 0 625 cx 2 875 cy 0 gt landformDisusedSymbol Style O stroke 666666 fill none stroke width 0 087 Geometry circleGeometry see Shared symbol geometry RN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown
18. 142 reasonForChange Value Description New This is a new feature in the database Position Feature has changed geometry and or position due to an improvement in its NOTE this is no longer used in absolute accuracy that is its relationship to the National Grid relevant for the positional accuracy improvement programme which is now complete This type of feature change is not associated with real world change current revision process Modified The feature has been edited by an operator Used in the following cases 1 The geometry of a topographic feature is changed following real world change 2 The geometry of a non topographic feature for example inferred link or BoundaryLine feature is changed 3 Acartographic symbol feature is repositioned 4 A CartographicText feature is repositioned Software Feature has been adjusted by an automatic software process Includes geometric adjustment cleaning squaring paralleling text and lines and reversing direction of digitising Reclassified The descriptive attributes of a feature have changed The feature code may have changed TextChange Text string of text feature has changed Applied to text features where the text string has been 1 Modified for a minor change in spelling due to original error or name change where text string is a distinctive name 2 Modified for changes to a descriptive name due to original error or change of
19. 565 0 119 0 569 0 113 0 572 0 106 0 575 0 100 0 578 0 093 0 580 0 086 0 582 0 079 0 583 0 071 0 584 0 064 0 584 0 057 0 584 0 049 0 583 0 042 0 582 0 035 0 580 0 028 0 579 0 021 0 576 0 014 0 573 0 007 0 567 0 007 0 559 0 020 o 551 0 033 0 542 0 045 0 533 0 057 0 523 0 069 0 514 0 078 0 505 0 086 0 495 0 094 0 484 0 101 0 473 0 108 0 462 0 114 Compound symbols The symbols defined in the section Fill symbols may be combined to form aggregated symbols In order to do this the coordinates of the original symbols are translated by a specified offset Compound symbols may be used as components to make up other compound symbols For example To define a scrub fill symbol we combine the bushFillSymbol and smallBushFillSymbol The translations used to do this are e bushFillSymbol translate 0 8 1 e smallBushFillSymbol translate 1 2 1 2 A The combined result a scrubFillSymbol is then drawn as Q To define the mixed vegetation type of scrub and rough grass the scrubFillSymbol produced above is used in conjunction with the roughGrassFillSymbol e roughGrassFillSymbol translate 1 1 f e scrubFillSymbol translate 1 1 ML To produce a roughGrassAndScrubFillSymbol n 0 0 EE OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 129 of 142 Definitions Transformation 1 Symbol 1 translate 1 0 3 S
20. England Scotland and Wales Figure 9 below shows an extract of OS MasterMap Topography Layer Geographic features are modelled in such a way as to make it easy to identify buildings roads water and land at a glance The data has been collected by Ordnance Survey and is based on the National Grid The basic unit of OS MasterMap Topography Layer data is a point line or polygon feature that represents a real world feature A feature may also have text that goes with it or a symbol Both are considered a feature within OS MasterMap Each feature comes with a set of attribution that provides information either about the real world object it represents or metadata that helps track changes to the feature The structure of OS MasterMap combined with its rich attribution gives scope to undertake guite complex geographic analyses and to enhance customers data capture processes Attribution provides the opportunity to use the data as far more than a map Using the product within a GIS attribution can be used to analyse sort guery and visualise the data in many different ways Each feature in OS MasterMap Topography Layer has a unigue reference called a TOID The vast majority of database systems used within organisations rely on the use of unigue referencing for the efficient management of the data stored within them Each feature also has a version number and a version date as well as the TOID As the real world feature that it represents changes duri
21. H0099ff fill H0099ff stroke width 0 087 Geometry circleGeometry see Shared symbol geometry Fill symbols boulderFillSymbol Style stroke H666666 fill none stroke width 0 087 Ae Geometry boulderGeometry see Shared symbol geometry bushFillSymbol Style stroke H669966 fill none stroke width 0 087 Geometry polyline points 1 1 493 0 076 1 493 0 452 0 893 0 584 0 683 0 666 0 449 0 693 0 202 0 668 0 088 0 596 0 005 0 491 0 058 0 284 0 082 0 078 0 046 0 109 0 046 0 396 0 268 0 151 0 027 0 055 0 248 0 218 0 55 0 335 0 873 0 35 1 027 311 1 176 0 224 1 303 0 016 1 447 0 23 1 503 0 391 1 485 0 54 1 421 0 663 1 316 0 866 1 029 1 004 0 704 1 07 0 358 1 061 0 006 0 982 0 383 0 849 0 758 0 666 1 111 0 435 1 434 0 396 1 5 gt o coniferousTreeFillSymbol Style stroke H669966 fill none stroke width 0 087 Geometry coniferousTreeGeometry see Shared symbol geometry RN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 122 of 142 coppiceFillSymbol Style stroke 669966 f1i11 none stroke width 0 087 Geometry li polyline points 0 000 1 219 0 000 1 819 gt polyline points 0 567 1 330 0 556 1 035 0 492 0 746 0 377 0 473 0 214 0 226 0 010 0 012 gt lt polyline points 0 547 1 248 0 567 0 817 0 639 0 392 0 762 0 022 gt lt polyline points 0 010 0 627 0 207 0 736 0 372 0 890 0 494 1 078
22. Height Line 10201 Terrain And Height Point 10200 Terrain And Height Symbol 10196 Terrain And Height Text 10198 Terrain And Height Point Air Height 10202 Terrain And Height Point Spot Height 10197 Tidal Water Area 10210 Tidal Water Line 10208 Tidal Water Point 10209 Tidal Water Symbol 10206 Tidal Water Text 10204 Tidal Water Text Compound 10207 Tidal Water Area Foreshore 10203 Tidal Water Text Foreshore 10205 Tidal Water Line Mean High Water Springs 10211 Tidal Water Line Mean Low Water Springs 10212 Unclassified Area 10217 Unclassified Line 10216 Unclassified Point 10215 Unclassified Symbol 10214 Unclassified Text 10213 OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 85 of 142 Make Value Description Manmade Features that have been constructed for example areas of tarmac or concrete Multiple Features that are a mixture of makes but are not depicted separately within the data for example the area around a dwelling may be a mixture of made and unmade surfaces Natural Features that are not man made but possibly man altered for example cliffs areas of water and uncultivated cultivated vegetation Unclassified Features that have not had a make allocated Unknown Features the make of which is not known physicalPresence Value Description Boundary Indicates that the feature is a political
23. Land not been given a description yet There are some additional rules for assigning lines to themes Lines serve two purposes in OS MasterMap Topography Layer There are lines that are coincident with the boundaries of polygon features These are the most common type of line of the two Some lines however do not form boundaries to other features These are called non bounding line features In addition to being a member of each theme for which it passes the theme rule a line feature that is part of the boundary of one or more polygon features is also a member of the themes of those polygon features For example any line feature that bounds a polygon feature that is a member of the roads tracks and paths theme is also a member of the roads tracks and paths theme in addition to any other themes to which it belongs Figure 20 below gives examples of the application of theme rules Polygons belong to building theme only Line belongs to building and land themes Polygon belongs to the road tracks and paths theme only Cl d Polygon belongs to the land theme only Line belongs to the land and road tracks and path themes Line belongs to land theme only Figure 20 application of theme rules OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 38 of 142 This chapter has discussed the themes of OS MasterMap Topography Layer and outlined the cont
24. Page 75 of 142 Simple attribute name Type Description boundedBy Rectangle The minimum enclosing rectangle that encompasses a geometry For departedFeatures this encompasses all geometries that a feature has had in its life cycle calculatedAreaValue Real The calculated area of an area feature polygon in sguare metres changeDate Date The date a change was made to the feature by an editor Forms part of the feature s complex attribute changeHistory NOTE this may not match the versionDate attribute deletionDate Date The date the feature was deleted from the Ordnance Survey maintenance database descriptiveGroup String This is the primary classification attribute of a feature It assigns a feature to one or more of 21 groups most of which are categories of real world topographic objects such as path building or natural environment others are categories of supportive or administrative features such as network or polygon closing geometry and political or administrative In general values of this attribute are not specific to particular feature types Due to limitations in the source data from which OS MasterMap was created there are some exceptions to this principle For instance the descriptiveGroup buildings or structure contains text describing or naming buildings and structures while the topographic features have the descriptiveGroup values of building glasshouse or
25. Please refer to the COU section for further details OS MasterMap Topography Layer technical specification chapter 4 v1 9 12 2010 Crown copyright Page 74 of 142 Chapter5 Attribute definitions Attribute data types Each attribute has one of the following data types Each item of information in a complex attribute has one of the following data types Type Boolean Date Integer MultiLine Point Polygon Polyline Real Rectangle String TOID Description Value of true or false Specifies a day within the Gregorian calendar in the format YYYY MM DD Any positive or negative whole number or zero A set of Polyline geometries See chapter 7 Geometry and topology for details A pair of easting and northing coordinates in metres defining a horizontal location in the British National Grid spatial reference system See chapter 7 Geometry and topology for details A closed area defined by one outer boundary and zero or more inner boundaries Each boundary is a closed ring of coordinate pairs interpolated as for a polyline See chapter 7 Geometry and topology for details An ordered set of points that are connected with a straight line between each pair See chapter 7 Geometry and topology for details A floating point number A rectangle defined in the British National Grid An ordered set of characters See annexe D for characters used in Topography Layer OS MasterMap unique feature identifier Simple
26. Y LLYRY LLYRY LLE YY nnne 67 Data specification 0Verview u uLLYLLLLL Y LYS seas eeaeeeseseeeseseeeaseaeeeseeeeaeeeeeeanes 68 Siem T NAF YF PEY FFR NOE FFF FFA FFR EU FFF HA SEE 68 LIYO HEH HE Y FE edi eile een ete eee ee eee 68 BR E EE 68 IN 68 tg 68 Theme definiti MS me 69 Rude EE 69 Administrative boundaries YY nL cece eeeeee cece eeteddeeanaeceeeeesaceceaeeeeeeeeeseeeeeeaaeeeees 69 ee e NF FEN RT NWR FFAN EYN YF NN ENFYS FR FEN ER FRYD 69 Hertage and antiquities eate ttr Y deesset YY SE 69 VE TEE 69 Eang EE 69 UE HE YH RA TREF FFF NF FF NHRAED ARF FFY FN RF 69 Roads tracks and paths uw eege 70 elle dl 70 Terral ANd Mio 70 i ie LG NR DH HR FN 71 mU LA PO Y M 71 Feature type attributes Y eee eeeeae ee ALL eene eene nennen nnne en enne nennen 71 TOpographicArea enne nenne ELLYR nnn nter erri sr ener nennt nnns nnn n nnn 71 TopographicLine enne en H HERE EL LLY LL ennt nnne nns n nnn 72 Boundarl me 72 Topograpbichoint HYLL LL LLALL LL cee 73 CartographicSymbol Y YYLLLLYL ALLE LLALL LEL ALL LL LLALL LL enne nen nnri nennen iren nnne nennen 73 CartographicText HYAY LLLL ALL LLLL ALL LLY ALL LL LLALL ELLA ALL LLEN ALLE LL AED EL RL nnn nennen 74 Departedteature nL YLHHHLL LL ns ttrt HL LLY nennen nente nter LL en nene rr LL LL tn nennen 74 Attribute definitions AUS RR RA EES RAOR EAR ARDEDUNEG SEENEN EE DDO
27. a Roman road Inferred Property The feature has been inferred from the surrounding topographic features in order Closing Link to divide large polygons Overhead A structure clear of the ground to allow access beneath it for example electricity Construction transmission lines cable car cables Upper Level Of Upper level of through public communication for example in multilevel shopping Communication centres featureCode The table below gives descriptions for each feature code value The feature code itself is arbitrarily assigned and so carries no information without this table Where features have multiple descriptive groups and or descriptive terms a single feature code is allocated If the feature has multiple descriptive groups the descriptive group nearest the top of the table is used to assign the feature code In the descriptive term column of the following table a blank box means multiple other or none This code is used for features with multiple descriptive terms with no descriptive term or with one descriptive term that does not have its own feature code The column feature type in the following table has been abbreviated by omitting the words topographic boundary and cartographic from the feature type names Where line appears in this column it includes both TopographicLine and BoundaryLine feature types Descriptive group Feature
28. also provide a solution to the needs outlined below Many customers use geographic products as a basis to derive their own data which can be time consuming and inefficient where features in the data are amalgamations of more than one real world feature or even parts of real world features Where the feature represents a real world feature that has an area such as a building or a parcel of land the feature is represented in the data as a polygon This is the first large scale product from Ordnance Survey to adopt a polygonised structure for such features This should provide opportunities for customers to derive their data with greater efficiency and ease as features can be selected either singularly or customers can group features together by selecting more than one feature The way and the extent of a customer s ability to take advantage of the polygonised structure will depend to a certain extent on the systems in use but most GIS have the necessary data capture tools OS MasterMap Topography Layer provides new and improved attribution relating to the real world object the feature represents This means certain types of analysis can be performed without the customer having to add their own attribution to the data first The improved attribution also means the customer can apply their own criteria to refine the data into sets of features that meet their own specific requirements An example of this would be finding buildings of a certa
29. and e ward Physical features shown in the administrative boundaries theme e boundary posts e boundary stones and e boundary markers Non physical features shown in the administrative boundaries theme e alignments of boundaries and e textual descriptions of e boundaries e boundary mereings and e boundary posts and stones Application of precedence Where two or more boundaries are coincidental a single alignment is shown by the most important boundary in the following order In England and Wales e county City and County of London unitary authority district London borough and metropolitan district civil parish community Inner and Middle Temples e European electoral regions county borough constituencies e Welsh Assembly electoral region and e electoral division and or ward In Scotland e unitary authority e European electoral regions county burgh constituencies e Scottish parliamentary electoral region and e ward OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 28 of 142 A textual description is used for clarification If the alignment of an administrative boundary coincides with any other feature other than another boundary then both will be shown in their respective themes More information on administrative boundary alignments can be found in annexe A Buildings Buildings are defined as roofed constructions usually with walls and being pe
30. and e other areas of vegetation including scrub heath rough grass and marshland In figure 15 below two different types of tree cover have been identified on the edges of a settlement Each type has been labelled using the attribution within OS MasterMap erous Trees Scrub Meadow View Figure 15 vegetation in the land theme OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 30 of 142 The theme also contains text features that describe these physical features Rail These are defined as features related to travel by railway or tramway Currently railway tunnels are in the structure theme The OS MasterMap Topography Layer contains information relating to permanent railways that form communication between two points for example from railway station to railway station or from an industrial building to a private guarry Standard gauge railways are shown to scale by a pair of rails Railways narrower than 1 435 m Standard guage are deemed to be narrow gauge and are shown by a single line representing the central alignment Tramways metros and light rapid transit systems are treated as railways Underground portions of the Metropolitan and District lines in London that are close to surface level are shown Where a deep level tube railway comes to the surface and continues as a normal railway it is shown as a standard gauge railway In other cities only the sections of unde
31. any change to a line feature may result in deletion or significant modification of that feature and creation of new line features This change is not necessarily caused by real world change to the linear object represented by the feature In the example above the original line feature is retained as one of the resultant line features the other line feature is new The user cannot predict which of the resultant line features will bear the original TOID The major exception to this is that when the reason for change is a correction of error rather than real world change then features are retained whenever possible The more rapidly changing life cycle means that associating user data with OS MasterMap line features by TOID references needs to be considered very carefully as there will be greater overheads in terms of managing change In most cases it will be more practical to associate with points and polygons rather than lines OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 24 of 142 Inferred links Inferred links are a particular type of line feature that does not actually exist in the real world An inferred link is a line that Ordnance Survey has introduced into the data to make some types of polygons into more manageable units There are two main uses The first type of inferred links is network closing links These are freguently found where roads meet at junctions If the roads were not split in t
32. attributes A simple attribute is one that contains a single piece of information that may be qualified by associated information such as its units of measure Geometric attributes are considered to be simple The following simple attributes occur in OS MasterMap features Simple attribute name Type Description accuracyOfHeightAboveDatum String The accuracy of a height above datum in metres at the 95 confidence level Attribute format as for accuracyOfPosition with Unknown as a valid value Part of the heightAboveDatum complex attribute accuracyOfHeightAboveGroundLevel String The accuracy of a height above ground level in metres at the 95 confidence level Attribute format as for accuracyOfPosition with Unknown as a valid value Part of the heightAboveGroundLevel complex attribute accuracyOfPosition String The accuracy of a horizontal position in metres at the 95 confidence level See Attribute values Accuracyofposition anchorPoint Point The coordinate position that a piece of text is positioned relative to Measured in metres in the British National Grid spatial reference system anchorPosition Integer Part of the textRendering complex attribute A number between 0 and 8 that specifies which part of the text is bound to the anchorPoint See Attribute values anchorPosition OS MasterMap Topography Layer technical specification chapter 5 v1 9 12 2010 Crown copyright
33. comply with XML identifier rules version Integer The version number of the feature in the range 1 to 4294967295 This uniguely identifies a specific version of a feature with a given TOID versionDate Date The date on which this version of the feature became the current version This is the date that the feature was changed in the database and is not the date of any associated real world change Complex attributes A complex attribute is an attribute that consists of two or more simple attributes that go together to convey some composite information about a feature changeHistory Information about the change history of a feature that comprises the reason for the change reasonForChange attribute and the date for this change changeDate attribute Each feature may have many change history records and these are ordered chronologically in the GML OS MasterMap Topography Layer technical specification chapter 5_v1 9 12 2010 Crown copyright Page 78 of 142 heightAboveGroundLevel This defines the height above ground level of a feature heightAboveGroundLevel attribute and defines the accuracy of this where known accuracyOfHeightAboveGroundLevel attribute heightAboveDatum This contains information about the height above OND heightAboveDatum attribute and where known the accuracy of this value accuracyOfHeightAboveDatum attribute textRendering Provides the information to graphically
34. copyright Page 120 of 142 pointSymbol Style e stroke 000000 111 000000 stroke width 0 087 Geometry circleGeometry see Shared symbol geometry positionedBoulderSymbol Style stroke 666666 f1i11 none stroke width 0 087 Geometry boulderGeometry see Shared symbol geometry positionedConiferousTreeSymbol Style stroke 666666 fill none stroke width 0 087 Geometry coniferousTreeGeometry see Shared symbol geometry positionedNonconiferousTreeSymbol Style stroke 666666 f1i11 none stroke width 0 087 Geometry nonConiferousTreeGeometry see Shared symbol geometry railwaySwitchSymbol Style stroke 000000 stroke width 0 087 Geometry polyline points 0 72 0 0 72 0 roadFlowSymbol Style stroke 1000000 fill none stroke width 0 087 Geometry polyline points 0 707 0 707 0 0 0 0 0 707 0 707 gt line x1 2 42 y1 0 0 x2 0 0 y2 0 0 gt spotHeightSymbol Style stroke 0000 fill none stroke width 0 087 Geometry crossGeometry see Shared symbol geometry OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 121 of 142 triangulationStationSymbol Style stroke 000000 stroke width 0 087 Geometry lt polyline style fill none points 0 0 794 1 375 0 794 0 0 1 588 1 375 0 794 0 0 794 gt circle style fill 000000 r 0 0875 cx 0 cy 0 0 gt waterPointSymbol Style o stroke
35. holes are shown and the area described as area of shake holes e sluices except those found in sewage works and culverts e stepping stones e taps which take the form of drinking fountains or that form the communal water supply drinking fountains and water troughs public e tidal gauges e waterfalls only if formed by natural features and weirs e bollards capstans and mooring posts e breakwaters and groynes e perches pilot beacons and navigational beacons and e pumps wells spouts springs and fountains Taps water troughs and drinking fountains are no longer captured under the current specification OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 34 of 142 Figure 17 shows a sample of real world objects in the water theme including a pond a river flow arrows sluices and drains Cattle Grid A Figure 17 examples of features within the water theme The non physical features shown in the water theme are e the highest point in a river to which normal tides flow is described as normal tidal limit NTL The point is shown and annotated with text e low water level LWL is the point to which mean tides or mean spring tides in Scotland flow at low water The point is shown and annotated with text e the text descriptions of all water features and e flow arrows which are symbols used to indicate the direction of flow of non tidal moving water As wate
36. information is only provided for spot heights Accuracy of height above datum The accuracy of a height above datum in metres Accuracy of height above ground level The accuracy of a height above ground level in metres OS MasterMap Topography Layer user guide chapter 5 v1 9 12 2010 Crown copyright Page 43 of 142 Non bounding line flag Some lines do not form boundaries of polygon features This attribute records this status by having either true or false as its value If the value is true then the line does not bound any polygon feature An example is given below in figure 21 The lines highlighted in red are all non bounding lines as they do not form part of a polygon s boundary Such lines often though not always have one free end They have been identified in the attribution so that customers can turn off the bounding lines if they so wish when they display the data Figure 21 example of a non bounding line shown in red Reference to feature A reference by TOID to a related feature In cartographic symbol features it is used to point from a water culvert symbol feature to the topographic feature to which it refers Accuracy of position The accuracy of a horizontal position in metres Anchor point A piece of text is bound to a coordinate position This position is called the anchor point and is measured in metres in the British National Grid spatial reference system Font orientation height and anchor positi
37. is the nominal accuracy of a point position at the 99 confidence level Unknown The expected positional accuracy is unknown NOTE these values differ by a small amount from the actual values see Absolute accuracy for more details anchorPosition Each text string that is captured with cartographic information has a location in the text string known as its anchorPosition that is bound to the digitised coordinate known as its anchorPoint There are nine defined locations identified by the numbers 0 8 that are shown in the diagram below descriptiveGroup Value Building Buildings Or Structure Built Environment General Feature General Surface Glasshouse Height Control Historic Interest Inland Water Landform Natural Environment 2 5 8 e 1 e e d e 1 pagar at bh 4 e e e 0 3 6 Description Features representing buildings not including glasshouses Text features describing or naming buildings and structures Geographic areas and extents of man made environments terrain and communication links General topographic features and minor detail Features representing describing or limiting areas of land not covered by buildings or structures Features representing glasshouses Features with height information Features of heritage value Features representing describing or limiting areas of water that are not tidal Features representing describing or limiting areas of landform
38. multiVegetationPattern see Pattern definitions RN OS MasterMap Topography Layer technical specification chapter 10 v1 9 12 2010 Crown copyright Page 101 of 142 TopographicLine and BoundaryLine Mapping table descriptiveGroup descriptiveTerm physicalPresence make Style name Building Outline Obstructing Manmade buildingLine Building Outline Overhead Manmade buildingOverheadLine Building Division Obstructing Manmade buildingLine General Feature Obstructing defaultLine General Feature Overhead Construction structureOverheadLine General Feature Edge Limit defaultDashedLine General Feature Minor Detail defaultLine General Feature Tunnel Edge Edge Limit defaultUndergroundLine General Surface Edge Limit Natural defaultDashedLine General Surface Step Edge Limit Manmade defaultLine General Surface Step Manmade defaultLine Historic Interest Course Of Heritage defaultUndergroundLine Historic Interest Minor Detail defaultLine Inland Water Tunnel Edge Edge Limit defaultUndergroundLine Inland Water Minor Detail Manmade waterLine Inland Water Culvert Manmade waterLine Inland Water Edge Limit waterLine Landform Top Of Slope Edge Limit Manmade landformBoldLine Landform Edge Limit Natural landformLine Landform Edge Limit Manmade landformLine Landform Bottom Of Cliff Edge Limit Na
39. of the XML schema According to the World Wide Web Consortium W3C XML schemas express shared vocabularies and allow machines to carry out rules made by people They provide a means for defining the structure content and semantics of XML documents Following a schema ensures a level of standardisation Standardisation encourages compatibility between different sources of data GML can therefore be considered as a worldwide standard language for the production and distribution of geographic data and this is why Ordnance Survey chose it as the format for OS MasterMap Topography Layer More information on the standards and the bodies governing the standard can be found on the following links e Open Geospatial Consortium OGC e World Wide Web Consortium W3C XML schema specification Information specific to OS MasterMap can be found using the following links e Schema repository e Schema changes It is important to understand the schemas when developing a translator or loader for OS MasterMap Full details of the schema and the GML can be found in the technical specification The majority of users that access the data after it has been either translated or loaded into their GIS need not be concerned with the details of the schema To speed up the online supply of data and enable areas to be supplied as complete files on CD or DVD the data will be compressed using the UNIX gzip compression method Most translators accept the zipped files d
40. point feature life cycle rules The life cycles of point features are simpler than those of lines or polygons since they cannot change in size or be split into multiple features Creation of point features When a new real world object comes into being a new point feature is created to represent it If however the object is a replacement for a previous real world object in the same position the original feature is retained An example would be if an existing postbox was replaced by another postbox in the same location Deletion of point features When a real world object is no longer present in the real world the point feature is removed from Ordnance Survey s holding Ordnance Survey keeps a record to indicate that the feature with this TOID used to exist and notifies the customer at the next date of COU supply Modification of point features due to real world change By the nature of the real world objects represented as point features in OS MasterMap data it is unlikely that one will be modified without changing its identity Therefore any modification to a point feature as a result of real world change will result in the deletion of the original feature and creation of a new feature unless there is a clear reason to identify the resultant real world object with the original This applies to both geometric change and change of descriptive group or descriptive term Modification of point features due to error correction When a point f
41. shared with the knowledge that all users can have confidence that they are referring to the same location and entity in the real world This can be critical in many applications The adoption of the DNF principle by businesses using GI can lead to the following benefits e_ using effective technigues for a create once use many times model that reduces the amount of data duplication and the cost of gathering data e_ delivering data integrity for underpinning critical business decisions by following a definitive maintained reference e lowering the costs of handling multi source data and e_ flexible data holdings that can underpin a wide range of applications without the need for recapturing data For more information on DNF including those organisations taking part in the initiative case studies of implementations using OS MasterMap and events please see the DNF website System reguirements OS MasterMap data is designed for use as a digital map within geographical information systems GIS and database systems For details of Ordnance Survey s Licensed Partners who can incorporate OS MasterMap in their systems please see the systems software page on the Ordnance Survey website Ordnance Survey does not recommend either suppliers or software products as the most appropriate system will depend on many factors such as the amount of data being taken resources available within the organisation and the existing and planned information
42. subdivide that data into manageable units OS MasterMap data has no tiles TOID An identifier that uniguely identifies every feature tuple coordinate tuple A set of n coordinates representing a point in n dimensional space as defined by a spatial reference system The British National Grid reference system is 2 D only so coordinate tuples consist of an easting and a northing coordinate unclipped data supply All features that wholly or partly lie within the query area are supplied and the full geometry of each of these features will be included in the supply OS MasterMap data is supplied unclipped underground level Detail that has reguired excavation below the ground surface either without disturbance of the ground surface above or where a replacement of the ground surface occurred after excavation This does not include obscured detail but it does include tunnels and subways Because of their nature tunnel alignments are not captured to the same accuracy as features on the surface unit of supply The definition of the way in which the area of interest is broken up into manageable physical units files for supply to the customer version date The date the version of the feature was created by Ordnance Survey within its master database of OS MasterMap version number A version number will identify that a feature has been altered Version numbers will be allocated sequentially with version 1 representing the creation of
43. taken The software needs to handle three types of situation features that have been departed features that are new and features that have changed The software should resolve departed features first Departed features e Inthe COU there is a list of features that have been departed since the last time the customer took data There are some additional considerations with departed features that are covered in more detail in chapter 6 on supply but in essence the software would find all the TOIDs and versions on the departed features list in the COU in the main holding and remove those features e Inthe case of superseded and departed features these could be removed totally from the customer s holding but it may suit the requirements of the customer better to archive them for future reference New features e With a new feature the software compares each TOID in the COU against the TOIDs in the existing holding If the TOID exists in the COU but not in the main holdings it is a new feature and the software should insert it into the holding Changed features e lf the TOID already exists in the holding the software needs to compare the version number in the existing holding against the version number in the COU The version number in the COU should be higher than in the existing holding In this case the software needs to take out the existing version of the feature and replace it with the version in the COU If on the other hand t
44. that are man made constructions but do not gualify as buildings These may or may not obstruct passage at ground level The Topography Layer contains information relating to all permanent structures that are large enough to be included Figure 16 below gives some examples highlighted in black of structures _ c Figure 16 examples of real world objects in the structure theme The physical features in the structure theme include e stand alone monuments e pontoons e fountains e uncovered tanks e covered reservoirs e conveyors e pylons e cooling towers e weirs and sluices e upper levels of communication and e gas holders e bridges viaducts agueducts and piers e double walls Non physical features include text OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 33 of 142 Terrain and height These are features that define ground level OS MasterMap Topography Layer does not contain height contours The following point features of Known height are included Triangulation stations These are physical marks that represent points in the national triangulation scheme The best known form is the triangulation pillar often found on hill or mountain tops Other forms include triangulation points placed on church towers and flagpoles The coordinates of a triangulation station in the data are not usually the very accurate coordinates for the control point The accurate coordinate
45. that are present inside a feature element These are simple complex and geometric properties The ordering of properties within a feature element is important as XML validation is reliant on elements being in a specified order The order of properties is specified within the XML schema Each type of property may additionally have associated metadata encoded using an XML attribute This metadata provides some gualification of the status or accuracy of the content provided in the attribute To see what metadata is currently encoded in this way see Attribute metadata Simple A simple property is one that contains a single piece of non geometric information These properties correspond to the simple feature attributes defined see chapter 5 Attribute descriptions The value of each feature attribute is enclosed in an element that takes its name from the feature attribute OS MasterMap Topography Layer technical specification chapter 9 v1 9 12 2010 Crown copyright Page 96 of 142 A feature association is a special type of simple property that defines a relationship between one feature and another The feature association is defined by the XML attribute xlink href This shall refer to a feature as if it was locally available even though this is not guaranteed to be the case that is it shall be set to the character 5 followed by osgb and then the TOID of the feature being referenced For example lt osgb descriptiveGroup gt Rail l
46. the natural land cover types present in the area The descriptive group and term attributes are frequently used in applying styling and in querying It makes the data more flexible and customisable in terms of customers being able to manipulate just the features they are interested in for any particular application OS MasterMap Topography Layer user guide chapter 5 v1 9 12 2010 Crown copyright Page 42 of 142 Physical level The physical level attribute states whether the feature is underground obscured below normal level at normal level or overhead Physical presence The physical presence attribute indicates the real world presence of the object represented by the feature for example a value of obstructing indicates that the feature prevents pedestrian access whereas a value of edge limit means that the feature represents a change of surface type and does not generally impede access Feature code Topography Layer features have a numerical feature code a five digit integer assigned to each feature This feature code is wholly determined by the feature type the descriptive group s and the descriptive term s The feature code can also be used to help style the data as it contains information about the geometric feature type whether it is a point line or polygon The feature code itself is an arbitrarily assigned number and is therefore not informative without the lookup table that gives the feature type and attrib
47. then apply pathFill or descriptiveGroup Road Or Track then apply roadFill or descriptiveGroup Structure then apply structureFill or descriptiveGroup Tidal Water then apply tidalWaterFill or descriptiveGroup Unclassified then apply unclassified Fill or descriptiveGroup Rail and then apply railFill make Manmade or make Manmade then apply madeSurfaceFill or make Natural then apply naturalSurfaceFill or make Unknown then apply madeSurfaceFill or make Multiple then apply multipleSurfaceFill else apply unclassifiedFill Property application logic multiple descriptive Term This section deals with the techniques for styling features with a descriptiveGroup value of Natural Environment that have multiple descriptive Term attributes This section only provides a selection of combinations that were prominent in a study of descriptive Term occurrences on natural environment features The patterns and symbols used are all defined in the style definitions section The logic to apply is as follows if descriptiveGroup Natural Environment _ then If Number of descriptiveTerm attributes 3 then apply relevant pattern for type combinations see Pattern definitions Or Number of descriptiveTerm attributes 2 then apply relevant pattern for type combinations see Pattern definitions or Number of descriptiveTerm attributes 1 then apply relevant pattern for type else apply
48. type Descriptive term Feature code Building Area 10021 Building Line 10017 Building Point 10022 Building Symbol 10016 Building Text 10020 Building Line Division 10018 Building Line Outline 10019 Buildings Or Structure Area 10025 Buildings Or Structure Line 10023 Buildings Or Structure Point 10024 Buildings Or Structure Symbol 10027 Buildings Or Structure Text 10026 Buildings Or Structure Text Compound 10028 Built Environment Area 10031 Built Environment Line 10032 Built Environment Point 10029 Built Environment Symbol 10030 Built Environment Text 10034 Built Environment Text Compound 10033 General Feature Area 10044 General Feature Line 10046 General Feature Point 10045 General Feature Symbol 10042 OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 82 of 142 Descriptive group Feature type Descriptive term Feature code General Feature Text 10043 General Feature Point Positioned Boulder 10051 General Feature Point Positioned Coniferous Tree 10050 General Feature Point Positioned Nonconiferous Tree 10048 General Feature Line Tunnel Edge 10041 General Surface Area 10056 General Surface Line 10052 General Surface Point 10057 General Surface Symbol 10055 General Surface Text 10059 General Surface Area Multi Surface 10053 General Surfa
49. version date It is likely to be earlier as it records when the change was observed by survey in the real world Reason for change and change date are collectively known as the change history attributes as they give the reasons that have led to this particular version of a feature coming into existence All change history for a feature is supplied in GML Feature description attributes There are five attributes common to all features that make up the descriptive attributes These are descriptive group descriptive term physical level physical presence and feature code Descriptive group This is the primary classification attribute of a feature It assigns a feature to one or more of 21 groups most of which are categories of real world topographic objects such as path building or natural environment Others are categories of supportive or administrative features such as network or polygon closing geometry and political or administrative boundaries Descriptive term This attribute if present gives further classification information about the feature A feature may have multiple descriptive term attributes but this is little used at present Most features have zero or one descriptive term attributes A situation where multiple descriptive term attributes are used is usually where polygon features have a descriptive group with the value of natural environment These features can have one or more descriptive term attributes specifying
50. 0 169 0 626 0 305 0 780 0 480 0 889 0 679 0 943 0 885 0 937 1 080 0 873 1 249 0 755 1 377 0 594 1 453 0 402 1 472 0 197 1 430 0 004 1 332 0 186 1 187 0 331 1 006 0 429 0 804 0 471 polyline points 0 171 0 629 0 171 1 497 gt RN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 124 of 142 rockFillSymbol Style stroke 666666 f1i11 none stroke width 0 087 Geometry lt polyline points 1 85 0 834 0 812 0 834 0 588 0 766 0 4 0 508 gt lt polyline points 1 824 0 834 1 272 0 78 0 908 0 666 0 888 epp 0 866 0 65 0 846 0 644 0 824 0 64 0 802 0 636 0 78 634 0 758 0 632 0 736 0 632 0 714 0 634 0 692 0 636 0 67 64 0 662 0 642 0 648 0 646 0 628 0 654 0 438 0 786 0 622 66 0 662 0 642 1 126 0 438 1 48 0 298 1 494 0 292 1 510 284 1 524 0 276 1 536 0 268 1 550 0 258 1 562 0 248 574 0 236 1 586 0 224 1 596 0 212 1 606 0 198 1 614 0 186 622 0 170 1 628 0 156 1 636 0 142 1 640 0 126 1 644 0 110 648 0 094 1 650 0 078 1 650 0 062 1 652 0 046 1 650 0 012 646 0 022 1 64 0 054 1 634 0 086 1 624 0 118 1 612 0 15 6 0 18 1 584 0 21 1 568 0 24 1 55 0 268 1 368 0 488 1 356 0 5 344 0 512 1 33 0 522 1 316 0 532 1 302 0 54 1 286 0 548 27 0 554 1 254 0 56 1 238 0 566 1 222 0 568 1 206 0 572 188 0 574 1 172 0 574 1 154 0 574 1 138 0 572 1 12 0 57 104 0 566 1 088 0 562 1 072 0 556 1 056 0 55 0 4 0 298 014 0 136 0 218
51. 0 328 0 715 0 427 0 620 0 530 0 531 0 639 0 449 0 753 0 374 0 871 0 306 crossGeometry polyline points 0 000 0 775 0 000 0 775 gt polyline points 0 775 0 000 0 775 0 000 gt nonconiferousTreeGeometry Arc geometry path d M0 1 6L 0 2 0 8a0 6 0 6 010 0 8 0 86a0 55 0 55 0 0 0 0 45 0 89a0 56 0 56 00 O 1 1 0 0a0 55 0 55 00 0 0 45 0 89a0 6 0 6 O 1 0 0 8 0 86L0 1 6z gt Linear geometry lt polyline points 1 074 0 097 1 210 0 031 1 299 0 194 334 0 377 1 312 0 561 1 233 0 730 1 106 0 866 0 944 957 0 761 0 993 0 576 0 972 0 407 0 894 0 270 0 768 269 0 765 0 068 1 539 0 012 1 539 0 193 0 756 0 193 756 0 329 0 887 0 499 0 969 0 685 0 993 0 870 0 959 036 0 869 1 164 0 731 1 244 0 561 1 267 0 374 1 230 0 189 138 0 025 0 999 0 102 1 087 0 259 1 119 0 436 1 094 0 615 012 0 775 0 883 0 901 0 720 0 979 0 541 1 000 0 541 1 000 464 1 184 0 331 1 331 0 156 1 427 0 040 1 461 0 236 1 427 411 1 331 0 544 1 184 0 621 1 000 0 801 0 978 0 964 0 900 1 093 0 773 1 175 0 611 1 199 0 431 1 164 0 254 1 074 0 097 gt Oomnbm mn ooocomn Point symbols airHeightSymbol Style stroke 10099ff fill none stroke width 0 087 Geometry crossGeometry see Shared symbol geometry benchMarkSymbol Style stroke 1000000 fill none stroke width 0 087 lt OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page
52. 0 82 0 402 0 81 0 295 0 696 0 194 0 561 0 124 gt lt polyline points 0 155 0 263 0 26 0 286 0 366 0 277 0 465 0 236 0 546 0 167 0 548 0 165 0 55 0 162 0 553 0 158 0 554 0 155 0 555 0 152 0 556 0 149 0 557 0 146 0 558 0 142 0 559 0 139 0 559 0 135 0 559 0 132 0 559 0 128 0 559 0 125 0 559 0 121 0 557 0 117 0 557 0 115 0 555 0 111 0 554 0 108 0 553 0 105 0 550 0 102 0 548 0 099 0 547 0 096 0 544 0 094 0 542 0 091 0 539 0 089 0 535 0 086 0 534 0 085 0 530 0 083 0 527 0 081 0 318 0 099 0 196 0 194 0 059 0 265 0 083 0 308 0 089 0 309 gt smallBushFillSymbol Style stroke H669966 fill none stroke width 0 087 Geometry lt polyline points 0 5 0 746 0 038 0 746 0 226 0 446 0 292 0 341 0 333 0 224 0 346 0 101 0 334 0 044 0 298 0 002 0 245 0 029 0 142 0 041 0 039 0 023 0 054 0 023 0 198 0 134 0 075 0 013 0 027 0 124 0 109 0 275 0 167 0 436 0 175 0 513 155 0 588 0 112 0 651 0 008 0 723 0 115 0 751 0 195 0 742 27 0 71 0 331 0 658 0 433 0 514 0 502 0 352 0 535 0 179 53 0 003 0 491 0 191 0 424 0 379 0 333 0 555 0 217 717 0 198 0 75 gt oooeo smallConiferousTreeFillSymbol Style stroke 1669966 fill none stroke width 0 087 A Arc geometry lt polyline points 0 0 725 0 0 775 gt path d M 0 65 0 475al 1001 0 65 0 502a1 1 00 1 0 65 0 502 gt path d M 0 45 0 15al 1001 0 45 0 425a1 10 0 1 0 45 0 425 gt Linear geometry lt poly
53. 00 1 110 0 675 gt lt polyline points 1 318 0 000 1 440 0 269 gt lt polyline points 1 326 0 000 1 447 0 269 gt lt g gt C HEHH OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 123 of 142 multiVegetationFillSymbol Style e stroke H669966 fill 669966 stroke width 0 087 Geometry circleFillGeometry see Shared symbol geometry naturalLandformFillSymbol Style stroke H666666 fill none stroke width 0 087 Ki Geometry lt polyline points 0 25 25 0 gt nonconiferousTreeFillSymbol Style stroke 669966 fill none stroke width 0 087 Geometry nonConiferousTreeGeometry see Shared symbol geometry orchardFillSymbol Style stroke 669966 fill none stroke width 0 087 Arc geometry path d M0 0a0 7 0 7 O 1 O 0 6 1 1a0 7 0 7 0 1 0 1 2 0 0a0 7 0 7 010 0 6 1 1z gt polyline points 0 0 88 0 0 Linear geometry polyline points 0 804 0 471 0 869 0 666 0 875 0 872 0 822 1 071 0 714 1 247 0 560 1 383 0 373 1 470 0 169 1 500 0 034 1 470 0 221 1 382 0 374 1 245 0 482 1 069 0 535 0 870 0 528 0 664 0 462 0 469 gt lt polyline points 0 462 0 469 0 665 0 428 0 847 0 332 0 994 0 186 1 092 0 005 1 135 0 197 1 117 0 403 1 041 0 594 0 913 0 756 0 744 0 875 0 548 0 939 0 342 0 945 0 143 0 891 0 033 0 781 0 169 0 626 polyline points 0 169 0 626
54. 00 lt gml coordinates gt lt osgb Rectangle gt lt osgb gueryExtent gt lt osgb polyline broken true gt gml MultiLineString srsName osgb BNG gml lineStringMember lt gml LineString gt lt gml coordinates gt 01289 2 970344 5 301300 0 970352 6 lt gml coordinates gt lt gml LineString gt lt gml lineStringMember gt lt gml lineStringMember gt lt gml LineString gt lt gml coordinates gt 301300 0 970354 1 301304 6 970369 8 lt gml coordinates gt lt gml LineString gt lt gml lineStringMember gt lt gml MultiLineString gt lt osgb polyline gt Complex A complex property is one that contains more than one piece of information These properties correspond to the complex feature attributes 0 0 HEN OS MasterMap Topography Layer technical specification chapter 9 v1 9 12 2010 Crown copyright Page 97 of 142 Class model The definition of a complex property here is recursive so complex properties may be nested Currently within OS MasterMap this recursion is not used 0 PropertyCollection compiexProperty complexProperty ILL iJ ngle Polyline Recta iJ E XML mapping The complex property element takes its name from the complex feature attribute Each part of a complex property shall be encoded as a simple complex geometry or topology property as appropriate inside the complex prop
55. 1 0 304 1 113 0 298 1 115 0 291 1 117 0 284 1 118 0 277 1 118 0 270 1 119 0 263 1 118 0 256 l1 118 0 249 1 117 0 242 1 115 0 235 1 113 0 229 1 111 0 222 1 108 0 216 1 105 0 209 1 101 0 203 1 097 0 198 1 093 0 192 1 088 0 187 1 083 0 182 1 078 0 177 1 073 0 173 1 067 0 169 1 061 0 165 1 054 0 162 0 637 0 198 0 393 0 388 0 118 0 530 0 165 0 616 0 178 0 619 gt circleFillGeometry circle r 0 05 cx 0 cy 0 0 gt circleGeometry circle r 0 375 cx 0 cy 0 gt C C HEE NEN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 118 of 142 coniferousTreeGeometry Arc geometry polyline points 0 1 45 0 1 55 gt path d M 1 3 0 95a2 20 01 1 3 1 05822 00 1 1 3 1 05 gt path d M 0 9 0 3a22 001 0 9 0 8532 20 01 0 9 0 85 gt Linear geometry polyline points 0 000 1 45 0 000 1 55 gt polyline points 1 303 0 970 1 168 0 927 1 037 0 874 0 909 0 814 0 785 0 746 0 666 0 670 0 552 0 586 0 444 0 496 0 342 0 398 0 246 0 295 0 156 0 185 0 074 0 070 0 000 0 050 0 074 0 070 0 156 0 185 0 246 0 295 0 342 0 398 0 444 0 496 0 552 0 586 0 666 0 670 0 785 0 746 0 909 0 814 1 037 0 874 1 168 0 927 1 303 0 970 polyline points 0 890 0 296 0 769 0 364 0 652 0 440 0 541 0 523 0 435 0 613 0 335 0 709 0 241 0 811 0 154 0 919 0 073 1 032 0 000 1 150 0 072 1 034 0 151 0 923 0 236 0 816
56. 135 Rail Area 10167 Rail Line 10155 Rail Point 10159 Rail Symbol 10161 Rail Text 10166 Rail Line Buffer 10160 Rail Text Compound 10156 Rail Line Narrow Gauge 10164 Rail Line Standard Gauge 10162 Rail Line Standard Gauge Track 10163 Rail Point Structure 10158 Rail Symbol Switch 10165 Rail Line Tunnel Edge 10157 Road Or Track Area 10172 OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 84 of 142 Descriptive group Feature type Descriptive term Feature code Road Or Track Line 10175 Road Or Track Point 10176 Road Or Track Symbol 10170 Road Or Track Text 10171 Road Or Track Line Public 10168 Road Or Track Text Road Name Or Classification 10169 Road Or Track Symbol Road Related Flow 10177 Road Or Track Line Tunnel Edge 10173 Roadside Area 10183 Roadside Line 10180 Roadside Point 10182 Roadside Symbol 10181 Roadside Text 10178 Roadside Point Structure 10179 Structure Area 10185 Structure Line 10195 Structure Point 10186 Structure Symbol 10194 Structure Text 10184 Structure Area Archway 10190 Structure Line Network Closing Link 10188 Structure Area Pylon 10193 Structure Line Pylon 10189 Structure Point 10192 Structure Point Structure 10191 Structure Area Upper Level Of Communication 10187 Terrain And Height Area 10199 Terrain And
57. 2 descriptiveGroup descriptiveTerm make Style name Roadside Unknown madeSurfaceFill Roadside Natural naturalSurfaceFill Structure structureFill Structure Manmade structureFill Structure Overhead Construction Manmade structureFill Structure Pylon Manmade structureFill Structure Upper Level Of Communication Manmade structureFill Tidal Water Natural tidalWaterFill Tidal Water Foreshore Natural tidalWaterFill and foreshorePattern Property application logic no or single descriptiveTerm This section defines the overall logic for applying the style The order of the property in the condition list below is the order that it is applied once applied the condition loop is exited This example below shows the notation for filtering using the descriptiveGroup and descriptiveTerm attributes features with multiple descriptive Term attributes are discussed in the next subsection if descriptiveGroup not Landform and descriptiveTerm not Pylon then apply if descriptiveGroup Building then apply buildingFill or descriptiveTerm Step then apply stepFill or descriptiveGroup Glasshouse then apply glasshouseFill or descriptiveGroup Historic Interest then apply heritageFill or descriptiveGroup Inland Water then apply inlandWaterFill or descriptiveGroup Natural Environment then apply naturalEnvironmentFill or descriptiveGroup Path
58. 31 Kee EE 31 RE 32 eM HR RR FA eegend 32 Elei E 32 Unmade e EE 32 ele dl 33 TO rman AMG MGI pem EE 34 Ns Ine Ee E re 34 BEEM 34 UE E 34 EE 36 OS MasterMap Topography Layer feature types and attribution 40 Point features iu mue CYN aei det EN Eet 40 BEE EE 40 le Ke el TEE A0 The value of assigning features to data types YY LLY ALL LL LLY FFH LL LLI non 40 Attribut ON MEET 40 COMMON attributor EE 42 Feature referencing attributes eene 42 Life cycle metadata EE 42 Feature description attributes ccccccccceceeeeeeeeeee aces ce eeeeeeeeeeaeceeeeeeeeeeeeaaaeeeeeeeeeeeeenanes 42 Other Attributes e PR LT 43 Geometric attributes m EE 45 OS MasterMap Supply 46 Online e E in e DEE 46 GML formatand EE EE 46 GST lt t EE 46 ue Kee ET ee 46 Updating data NOlIIGS EE 47 Managed Great Britain GB Sets sss 47 tee ele Le EE 47 CRUNK UE 48 Feature validation dataset FVDS nnr Y LLALL YL L LA LLLL HYLL LLY LLY ELLY LLI nLnoon 50 GML summary A UE 50 Departed features rrr I LLI ILL LI trett EL eene LL RE LEL enne LLE REED DL nennen nnne 50 su MAINES PE 51 Other file NAMES LLY eee LLALL HYLL LLY LL AL H HEL LL ELLYLL RH HEL EL ELLYLL EEEE FEL 52 Change management and data association eese enne 53 Change management 53 Archiv
59. 5 0 242 0 650 259 0 643 0 277 0 635 0 294 0 626 0 310 0 616 0 326 605 0 341 0 593 0 356 0 581 0 369 0 567 0 382 0 553 394 0 538 0 405 0 522 0 415 0 506 0 424 0 489 0 433 471 0 440 0 454 0 445 0 436 0 450 0 417 0 454 0 399 456 0 380 0 458 0 362 0 458 0 343 0 457 0 324 0 455 306 0 451 0 288 0 447 0 270 0 441 0 253 0 435 0 236 427 0 219 0 418 0 203 0 408 0 188 0 397 0 173 0 386 160 0 373 0 147 0 359 0 135 0 345 0 134 0 344 0 033 731 0 006 0 731 0 097 0 339 0 097 0 339 0 195 0 423 320 0 457 0 447 0 436 0 553 0 364 0 619 0 253 0 632 0 124 590 0 003 0 500 0 090 0 554 0 203 0 552 0 329 0 495 0 441 395 0 516 0 271 0 539 0 213 0 658 0 109 0 740 0 019 0 769 148 0 740 0 252 0 658 0 310 0 539 0 434 0 516 0 535 0 440 0 592 0 327 0 592 0 201 0 537 0 087 Looooooooooooooo RN OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 128 of 142 smallRockFillSymbol Style Er stroke 1666666 fill none stroke width 0 087 Geometry polyline points 0 925 0 417 0 406 0 417 0 294 0 383 0 200 0 254 gt lt polyline points 0 912 0 417 0 636 0 390 0 454 0 333 0 444 0 329 0 433 0 325 0 423 0 322 0 412 0 320 0 401 0 318 0 390 0 317 0 379 0 316 0 368 0 316 0 357 0 317 0 346 0 318 0 335 0 320 0 331 0 321 0 324 0 323 0 314 0 327 0 219 0 393 0 311 0 330 0 331 0 321 0 5
60. 50 Mb via the online service Each feature appears in only one chunk file It is possible for features from various geographic locations to appear in one file and for adjacent features to appear in different files Non geographic chunk files are designed for use as a set to load spatial databases but can be used in a file format as long as all chunks are translated or imported into the system at the same time It is not possible to tell in which file a particular feature will be found before reading the files With non geographic chunks there are no duplicate features lying across chunk edges this speeds up the translation process The features shown in red in figure 24 can end up in the same non geographic chunk even though they are not adjacent to each other OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 49 of 142 A Figure 24 non geographic chunking Feature validation dataset FVDS The FVDS is a new set of files that can optionally be supplied with either a full supply or a COU OS MasterMap order The FVDS can be ordered with the Topography Address and ITN Layers and must be supplied together with an OS MasterMap data order it cannot be produced on its own FVDS allows a customer to validate that the data holding contains the correct set of features after loading the data with which it was supplied It reports on all the data it expects to find in the holding after the applica
61. 63 0 219 0 740 0 149 0 747 0 146 0 755 0 142 0 762 0 138 0 768 0 134 0 775 0 129 0 781 0 124 0 787 0 118 0 793 0 112 0 798 0 106 0 803 0 099 0 807 0 093 0 811 0 085 0 814 0 078 0 818 0 071 0 820 0 063 0 822 0 055 0 824 0 047 0 825 0 039 0 825 0 031 0 826 0 023 0 825 0 006 0 823 0 011 0 820 0 027 0 817 0 043 0 812 0 059 0 806 0 075 0 800 0 090 0 792 0 105 0 784 0 120 0 775 0 134 0 684 0 244 0 678 0 250 0 672 0 256 0 665 0 261 0 658 0 266 0 651 0 270 0 643 0 274 0 635 0 277 0 627 0 280 0 619 0 283 0 611 0 284 0 603 0 286 0 594 0 287 0 586 0 287 0 577 0 287 0 569 0 286 0 560 0 285 0 552 0 283 0 544 0 281 0 536 0 278 0 528 0 275 0 200 0 149 0 007 0 068 0 109 0 118 0 291 0 199 0 297 0 202 0 302 0 205 0 308 0 209 0 313 0 212 0 318 0 216 0 322 0 221 0 327 0 226 0 331 0 230 0 334 0 236 0 338 0 241 0 341 0 247 0 344 0 252 0 346 0 258 0 348 0 264 0 349 0 271 0 351 0 277 0 352 0 283 0 352 0 290 0 352 0 296 0 352 0 302 0 351 0 309 0 350 0 315 0 348 0 321 0 346 0 327 0 344 0 333 0 341 0 339 0 338 0 345 0 335 0 350 0 331 0 355 0 276 0 421 0 276 0 421 0 273 0 424 0 270 0 427 0 266 0 429 0 263 0 432 0 259 0 434 0 256 0 436 0 252 0 437 0 248 0 439 0 244 0 440 0 240 0 441 0 236 0 442 0 232 0 443 0 227 0 443 0 223 0 443 0 219 0 443 0 215 0 442 0 211 0 441 0 207 0 440 0 203 0 439 0 199 0 438 0 195 0 436 0 099 0 406 0 189 0 300 0 397 0 204 0 523 0 158 0 529 0 155 0 535 0 151 0 541 0 146 0 547 0 141 0 552 0 136 0 557 0 131 0 561 0 125 0
62. DOINS wi cecgcieeea eee dete SEENEN EEN Ee eu 119 al LE Lle EE 122 Compound E le e EE 129 Definitions HU NAF 130 izursnspolenblden p 134 SCENE HN YR EE 137 Character Sel uu Y 141 v1 9 12 2010 OS MasterMap Topography Layer technical specification contents v1 9 12 2010 Crown copyright Page 65 of 142 Introduction Purpose of this specification and disclaimer This is the technical specification hereafter referred to as the specification applicable to the OS MasterMap Topography Layer hereafter referred to as the product which is referred to in the Framework Direct Licence Specific Use Framework Partner Licence or your other customer contract for the product We may change the information in this specification at any time giving you the notice period specified in the customer contract made between you and Ordnance Survey We do not accept responsibility for the content of any third party websites referenced or accessed in or through this specification any other contractual documentation and or the Ordnance Survey website Copyright in this specification This specification including for the avoidance of doubt any mapping images reproduced herein is Crown copyright 2009 All rights reserved Any part of this specification may be copied for use internally in your organisation or business so that you can use OS MasterMap Topography Layer for the pur
63. Descriptive term Feature code Landform Text Compound 10105 Landform Point Disused Feature 10100 Landform Line Ridge Or Rock Line 10101 Landform Area Slope 10096 Landform Line Top Of Cliff 10104 Landform Line Top Of Slope 10098 Natural Environment Area 10111 Natural Environment Line 10110 Natural Environment Point 10109 Natural Environment Symbol 10108 Natural Environment Text 10107 Network Or Polygon Closing Geometry Area 10116 Network Or Polygon Closing Geometry Line 10115 Network Or Polygon Closing Geometry Point 10118 Network Or Polygon Closing Geometry Symbol 10117 Network Or Polygon Closing Geometry Text 10112 Network Or Polygon Closing Geometry Line Inferred Property Closing Link 10114 Network Or Polygon Closing Geometry Line Polygon Closing Link 10113 Path Area 10123 Path Line 10124 Path Point 10120 Path Symbol 10121 Path Text 10122 Path Area Step 10119 Path Line Tunnel Edge 10125 Political Or Administrative Area 10126 Political Or Administrative Line 10137 Political Or Administrative Point 10132 Political Or Administrative Symbol 10134 Political Or Administrative Text 10133 Political Or Administrative Symbol Boundary Half Mereing 10130 Political Or Administrative Point Boundary Post Or Stone 10129 Political Or Administrative Line County 10127 Political Or Administrative Line District 10131 Political Or Administrative Line Electoral 10128 Political Or Administrative Line Parish 10136 Political Or Administrative Line Parliamentary 10
64. Drive SOUTHAMPTON United Kingdom SO16 0AS General enquiries calls charged at local rate 44 0 8456 05 05 05 Dedicated Welsh Language HelpLine 08456 05 05 04 Textphone deaf and hard of hearing users only please 44 0 23 8005 6146 customerservices ordnancesurvey co uk www ordnancesurvey co uk This document has been screened in accordance with the requirements set out in Ordnance Survey s Equality Scheme If you have difficulty reading this information in its current format and would like to find out how to access it in a different format Braille large print computer disk or in another language please contact us on 44 0 8456 05 05 05 Use of the product The terms and conditions upon which the product including this guide is made available to you and your organisation are contained in the customer contract made between you and Ordnance Survey If there is an inconsistency between the terms of your customer contract and this guide then the terms of your customer contract prevail If you or your organisation has not signed a valid current customer contract then you are not entitled to use the product Purpose and disclaimer This guide is provided for guidance only and does not constitute any warranty representation undertaking commitment or obligation express or implied about the product or its suitability for any particular or intended purpose Any warranties representations undertakings commitments and obligations
65. I from OS MasterMap Topography Layer They use the individual features that Ordnance Survey provides to form the building blocks for their own sets of Gl Many local and central government organisations use it this way A local authority for example may use it to maintain a register of land and buildings in their ownership Once they have the physical feature or group of features they are interested in they can attach their own attribution to that already provided with the product When this kind of data association takes place it can lead to efficiencies in storing and using data It can also enable data to be shared more easily between and within organisations As more and more Gl is created it is possible to analyse the spread and distribution of features or activities and learn from their relationship to other physical features For example a police force might plot the locations of certain types of street crimes and by analysing the pattern and the timing of the incidents against the local topography it may be able to target its resources more efficiently OS MasterMap Topography Layer can also be used as part of a predictive or modelling tool For example OS MasterMap Topography Layer is also used by organisations looking for areas where specific physical conditions exist A retailer for example may use OS MasterMap Topography Layer to help it find a site for a new store by using the attribution to find land parcels of a certain size and di
66. ID d d d d d d Text string d Version d d d d s d Version date d d d d s d The next section describes the attributes that are common to all features Attributes are grouped into those associated to the referencing and change management of the feature and those that are descriptive that is that detail properties of the real world object the feature represents OS MasterMap Topography Layer user guide chapter 5 v1 9 12 2010 Crown copyright Page 41 of 142 Common attribution Feature referencing attributes Theme A theme to which the feature belongs This will be one or more of the themes described in chapter 4 TOID The unique identifier comprising a number and the four letter prefix osgb It is recommended that the TOID be treated as a text string rather than a number as some TOIDs have zeros at the beginning the TOID should always be retained stored in its entirety Life cycle metadata Version The version number of the topography feature Version date The date this version of the feature became the current version This is the date on which the feature was changed in the database and is not the date when the real world object it represents changed Reason for change The reason why a new version or new feature has been created or changed There can be more than one reason per version Change date The date of the above reason for change This will not necessarily be the same as the
67. Information is only useable in conjunction with the Roads Network data so can only be ordered together with the Roads Network theme The Roads Network theme can be ordered on its own The ITN Layer contains approximately 13 million road features and 1 5 million items of Road Routing Information Figure 6 shows a selection of the Roads Network Each colour represents a different classification of road Figure 6 OS MasterMap ITN Layer OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 12 of 142 Imagery Layer The Imagery Layer comprises aerial images An example of the Imagery Layer is shown in figure 7 The images have been orthorectified so that the features in the other layers align well with their counterparts in the image The aerial images bring context to the features that exist within the vector layers It also allows interpretation of other features that are not held as features in the vector datasets The images have also been captured under specific weather and time conditions to minimise obscuration by shadows and cloud Each image is also colour balanced with its adjacent images to minimise differences in the colours of the physical environment These differences occur largely as a result of flying at different times during the year Figure 7 OS MasterMap Imagery Layer Themes A theme is a set of features that have been grouped together for the convenience of c
68. Layer it is important from the point of synchronising these links that supply of all layers is taken at the same time Updating data holdings The OS MasterMap database is live and undergoes continuous revision Period licence customers have unlimited access to COU and can order updates or resupplies at any time When a customer orders COU a change since date is specified and all features that have changed since midnight on the date specified are supplied This will normally be the date the data was last extracted from the Ordnance Survey main holding but could be a previous date The last extraction date can be found on the label of the CD DVD containing the data order no date or in two read me files accompanying the data extraction date More information on ordering COU is available from Ordnance Survey s website To be able to resolve changes to the data holding the system used to translate or load the data must check the TOID and version of every feature in the update against the current data holding to determine whether it should be loaded and if so what existing feature s it replaces This makes it possible to request and load COU with a date preceding the last data supply date without damaging the data holding This process can be used to correct a data holding if inconsistencies have occurred due to partially loaded or non sequential COU by ordering a single COU with a change since date that precedes the problem updates More i
69. Name nonconiferousTreesAndScatteredRocksFillSymbol Symbol 1 nonconiferousTreesFillSymbol F Symbol 2 smallRockFillSymbol Se Name coniferousTreesAndScatteredRocksFillSymbol Symbol 1 coniferousTreesFillSymbol gt Symbol 2 smallRockFillSymbol Name roughGrassAndBouldersFillSymbol Symbol 1 roughGrassFillSymbol p Symbol 2 bouldersFillSymbol Name roughGrassAndConiferousTreesFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 coniferousTreesFillSymbol P E Name roughGrassAndHeathFillSymbol Symbol 1 roughGrassFillSymbol UM Symbol 2 heathFillSymbol SCH OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 131 of 142 Name roughGrassAndMarshFillSymbol Symbol 1 roughGrassFillSymbol wen mm Symbol 2 marshFillSymbol Name roughGrassAndNonconiferousTreesFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 nonconiferousTreesFillSymbol Name roughGrassAndRocksFillSymbol Symbol 1 roughGrassFillSymbol E Symbol 2 rocksFillSymbol Name roughGrassAndScatteredBouldersFillSymbol Symbol 1 roughGrassFillSymbol CN Symbol 2 smallBouldersFillSymbol Name roughGrassAndScatteredNonconiferousTreesFillSymbol Symbol 1 roughGrassFillSymbol 3 eye Symbol 2 smallNonconiferousTreeFillSymbol Name roughGrassAndScatteredRocksFillSymbol Symbol 1 roughGrassFillSymbol 2 Symbol 2 smallRockFillSymbol wae Name roughGrassAndScrubFillSymbol Symbol 1 roughGrassFillSy
70. Ord Ed OS MasterMap Topography Layer User guide and technical specification OS MasterMap Topography Layer User guide Contents Section Preface Chapter 1 Chapter 2 Chapter 3 Chapter 4 Page no 4 Go ntact det ils EN 4 Use of Elte le ET 4 Purpose and disclairri amp l seve ccaccsasrizentnedadicenseannnnveccaecenasdedannndatenvnccuanaaneaadedaedeandnndesdevaendeadsanneevaces 4 Copyright inthis GUJE EE 5 Data copyright and other intellectual property obt 5 Re EE 5 Back up provision of the product LLY ALLE LLALL LEL FFYDD nnne nns 5 USING this Ile 5 Introduction to OS MasterMap products cccceseeeceeeeeeeeeeeeeeeeeeeeeeseneeeaneeseeeeeseesseaneeseeees 6 rue ie Lo Lo EE 6 The vector and raster data models 2 2 endisse tea kd npa a EY ees AR EE RR ER nes Enna 7 The Digital National Framework DNF 8 SY EIcItze Pitz cfe I Im 9 Iiic 10 EISE M 10 Topography A TEE 10 Address Layers nien etcetera tod y bee Ny ede edv vu dyu vue YY dereud 11 Integrated Transport Network ITN Layer eene 12 lutea 13 Iure e 13 si MUR LE NYTH E NWN CHYF 13 ter 14 Introduction to OS MasterMa
71. S MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 7 of 142 17 x 482750 m y 316680 m 16 3 4 Hom 81 82 83 84 wooo 8 Figure 2 vector data is stored as coordinates The raster model encodes the features as pixels within a geographically referenced image The representation of the feature is made by the colour of the pixel see figure 3 Figure 3 raster data is stored in a grid made up of pixels These models result in datasets that are very different in terms of how the data can be used The main difference is that with vector models multiple attributes can be stored alongside the coordinates that supply the geometry In raster models usually only one piece of information can be stored apart from the colour against the pixel Typical examples include a height measurement or a value representing a type of land cover OS MasterMap Topography Address and ITN Layers have much in common with each other in terms of their structure and how they can be used and much of the information within this general guide can be applied to all vector layers The Imagery Layer has been geographically referenced to align with the other layers to the greatest extent possible as shown in figure 1 The Digital National Framework DNF The OS MasterMap products are different from other Ordnance Survey products OS MasterMap has been designed to facilitate the adoption of a larger geographic c
72. TRA 75 Attribute data types HYLL ALLLLLLLL ALLE LLALL ennemi nennen nennen enne CDLL nennen nnns 75 Simple attributes 75 Complex attributes eene eren enn ennenenrtr ELLYR HD tnn LL nnns 78 change F Sto 5 deiode FERN T MR Ped Erde rege ee dE ERR 78 heightAboveGroundL evel ettet tag a I OR EI SERE EYE ERR giu 79 heightAbove Datum roinn rt eden pe eb ren tu FEVER RR RE VRBE Ede dX RETE RR APER 79 TOXUR OMG e EE 79 Attribute metadata EE 79 eg TU 80 Attribute UE 80 ee Dee E le ELE 80 le ele en EE 80 el elei EE 80 ele a 6 CN KREE EN VE TEE 82 UE LEE E 86 physicalPresence goe Tue rua FF KAREE EA eee 86 reasonForChange reed eer d b een leaned 87 Geometry and topology e crrecieece cuia en aE EAE ita Dp nado Dona EES DDAA 88 OS MasterMap Topography Layer technical specification contents v1 9 12 2010 Crown copyright Page 63 of 142 Chapter 8 Chapter 9 Chapter 10 Chapter 11 Annexe A Annexe B Annexe C aui fre 1o UT oa o aY PEN AN HF Y CN A I RE AN Y A HN A 88 Features and spatial data Ivpes HYLL LLY LY RH HLR LLY LL RHYL LLY LLY enne 88 Coordinate reference SyStemS YH LLY A LL LL HL eene nennen enne eren 88 British National Grid DNG cect etter erent etre ieee CLLH ene ennemi 88 Geometric data types Y LLY ieee eee etnies erties LLALL LLD n e nennen nennen nennen 88 e Ey 88 weil rre 89 MUI e
73. acter Natural relief features such as hills are not normally shown although they may be named Detail that is too small to be shown at scale but is sufficiently important or prominent is shown by a symbol All administrative boundaries are shown physical level An attribute giving an ordinal classification applied to vertical relationships between various features or within feature collections In the OS MasterMap context this is the level at which the feature lies that is underground obscured ground level or a level above ground physical presence A feature attribute indicating whether a feature represents an obstructing or non obstructing real world object Also includes several other possible values point A pair of coordinates point feature A feature representing a real world object The geometry of a point feature is a single point a pair of coordinates with optional size and orientation polygon Polygons are representations of areas A polygon is defined as a closed line or perimeter that completely encloses a contiguous space and is made up of one or more lines polygon feature A polygonised representation of a real world object A polygon feature may be used to represent a building field lake administrative area and so on positional accuracy The accuracy of the feature geometry relative to the coordinate spatial reference system OS MasterMap Topography Layer technical specification annexe A v1 9 12 2010
74. ademarks of Adobe Systems Incorporated Arial is a registered trademark of The Monotype Corporation English Heritage is a registered trademark of the Historic Buildings And Monuments Commission For England OGC is a registered trademark of the Open Geospatial Consortium Royal Mail is a registered trademark of Royal Mail Group plc UNIX is a registered trademark of X Open Company Ltd Verdana is a registered trademark of Microsoft Corporation W3C is a registered trademark of Massachusetts Institute of Technology Back up provision of the product You are advised to copy the supplied data to a back up medium Using this guide The documentation is supplied in portable document format PDF only Free Adobe Acrobat Reader software which displays the guide incorporates search and zoom facilities and allows you to navigate within Hyperlinks are used to navigate between associated parts of the guide and to relevant Internet resources by clicking on the blue hyperlinks and the table of contents If you are unfamiliar with any words or terms used and require clarification please refer to the glossary at the end of the document OS MasterMap Topography Layer user guide preface v1 9 12 2010 Crown copyright Page 5 of 142 Chapter1 Introduction to OS MasterMap products Introduction OS MasterMap is a consistent and maintained framework for the referencing of geographic information Gl in Great Britain It comprises four separate
75. along with the following attributes that assist the software to manage the change within the customer s holding It is important to note that the actual geometry of the feature is not supplied Departed feature bounding rectangle Each departed feature states a bounding rectangle within which the feature lies This rectangle is not necessarily the minimum rectangle of the last version of the feature Instead it is a bounding rectangle of all versions of the feature that have existed within the chunk area for geographic chunked orders or order extent for non geographic chunked orders since the extraction date of the last supply of data and of all versions of the feature with bounding rectangles within the area extent This ensures that customers that hold a superseded version of the feature will find this version within the rectangle even if the feature has subseguently changed shape or location Departed feature theme s Each departed feature states the theme or themes it has been a member of since the extraction date of the customer last supply of the data Added themes may or may not be included Again this is to ensure that customers who hold a superseded version of the feature will be able to locate it in theme based or layer based data holdings Reason for departure Departed features report whether they are a deleted the feature no longer exists within OS MasterMap b vacated indicates that the feature is no longer withi
76. ancing the queries that can be run on their data and so providing better information for decision making There are two general concepts that are relevant to understanding the information contained in the rest of the document The first concept refers to the data models that are used to represent the real world in a digital environment The second explains the underlying concept for the OS MasterMap product as a whole and how and why effort is being made to integrate the different layers The vector and raster data models There are two common models for holding GI within a computer environment These are the vector and raster models The OS MasterMap Topography Address and ITN Layers are vector data The Imagery Layer is raster data The vector model holds features as a series of geometric shapes based on coordinates within a file or database see figure 2 Within OS MasterMap Topography Layer features are captured as a series of coordinates with each coordinate indicating a vertex or node in the geometry of the feature Surveyors work in millimetres so there is a tolerance for each point if it is within a certain distance of another point it is deemed to be the same coordinate The relationships between features are implied rather than explicit Each feature is stored independently of any other feature therefore there is no information contained on a line for example to record what lines it joins to or what polygons to which it is adjacent O
77. and maintained by Ordnance Survey within one of the world s largest spatial databases The data is delivered as a seamless geographically contiguous area This means that the customer receives only the area they order without additional unwanted data as may happen with tile based products Each feature is uniquely referenced and also has attributes that record the feature s life cycle The feature s life cycle is linked to the life cycle of the real world object it represents The life cycle records certain types of changes to the feature that occur over time Total as of May 2006 OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 6 of 142 de Figure 1 the OS MasterMap layers These characteristics mean that customers may use OS MasterMap in a wide variety of ways including e improving the accuracy of a customer s own derived data e improving a customer s data capture processes e_ creating consistency and achieving maintainable standards within geographic data holdings e_ establishing a common reference between a customer s own datasets and data they may wish to share with other organisations e improving the visual clarity of data and aiding the visual interpretation of data e using the products in an integrated manner to derive additional information e identifying and managing change in their area of interest e creating historical views of their area of interest and e enh
78. ange constitutes a change to an existing feature in the data and what change causes a new feature to be created The rules behind these decisions are discussed further in the descriptions of change only update COU and life cycle rules The main purpose behind the handling of feature life cycles in the data is to provide users with a consistent representation of changes in the real world based on a capture specification Due to the periodic way in which data is captured and updated other surveyable changes may have occurred to the real world feature between survey dates and these intermediary changes will not be recorded in the data Integration of the OS MasterMap layers A main premise of OS MasterMap is that layers can be integrated with each other Layers are integrated by the sharing of common coordinate systems and context With the exception of the Imagery Layer the TOID feature identifier attribute provides a unique feature level link for referencing between related features in different OS MasterMap layers and user s features For example in OS MasterMap Address Layer 2 data there is an explicit link between the addressable feature and the OS MasterMap Topography Layer feature that it falls within Similarly the OS MasterMap ITN road links are attributed with the TOID of the Topography Layer feature they fall within OS MasterMap Topography Layer technical specification chapter 1 v1 9 12 2010 Crown copyright Page 67 of 142 Chapte
79. anslate 2 1 Name roughGrassScatteredRocksAndBouldersFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 smallRockFillSymbol aL gt Symbol 3 bouldersFillSymbol Ei OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 133 of 142 Name roughGrassScatteredRocksAndHeathFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 smallRockFillSymbol 2 Symbol 3 heathFillSymbol Name roughGrassScatteredRocksAndScatteredBouldersFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 smallRockFillSymbol ees Symbol 3 smallBoulderFillSymbol Name roughGrassScatteredNonconiferousTreesAndScrubFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 smallNonconiferousTreeFillSymbol Symbol 3 scrubFillSymbol Name scatteredConiferousTreesScatteredNonconiferousTreesAndScrubFillSymbol Symbol 1 smallConiferousTreeFillSymbol Symbol 2 smallNonconiferousTreeFillSymbol a Symbol 3 scrubFillSymbol Pattern definitions Creating a pattern The symbols defined in Symbols and Compound symbols that end with the term FillSymbol are all used for pattern fills The name of the pattern is taken from the symbol name by replacing FillSymbol with the term Pattern The exceptions to this principle are e scatteredBouldersPattern uses smallBoulderFillSymbol e scatteredRocksPattern uses smallRockFillSymbol e scatteredConiferousTreesPattern uses smallConiferousTreeFillSymbol e scatteredNonconiferousTreesPattern use
80. are usually features that do not pose an obstacle to pedestrians such as kerbs history In the context of geospatial data the storage of deleted features and superseded versions of features identifier An identifier that is primarily intended to provide unigue and unambiguous feature identification for the purposes of exchanging feature based information between computer systems or associating data within a computer system indefinite detail Indefinite detail is defined as those physical features that are significantly important and have an outline that is either liable to change or not defined precisely by any surveyable feature for example vegetation limits or man made slopes The nature of vegetation is shown except for trees and scrub bushes brambles and undergrowth growing in permanent water Indefinite detail is not surveyed precisely The accuracy of survey is related to the degree of definition on the ground independent supply The supply structure used for OS MasterMap product feature geometry in which the data is simplified into area point and line features with no relationship between them and with their own explicit geometry For example the bounding line between two areas will be represented three times each with their own description of the geometry once as a line feature once as part of the bounding line of the first area feature and once as part of the bounding line of the second area feature inferred links L
81. areas that have a line based geometry Features representing topographic objects and other concepts that have a point based geometry Features providing information on symbols used when rendering OS MasterMap graphically Features that define the content and placement of text when rendering OS MasterMap graphically In addition if change only update COU supply has been provided then the data may contain information about the movement and deletion of features These are represented by the following feature type DepartedFeature Features that indicate that a feature in a previous supply may no longer be relevant for example it may have been deleted or moved This is used in COU data supply only A description of COU data supply is provided in the OS MasterMap Topography Layer user guide Feature type attributes This section defines the attributes associated with each OS MasterMap Topography Layer feature type and shows the expected occurrence in the data of the attributes for each feature type This is shown in UML notation that is if they are optional 0 and if they can be single 1 or multiple with or being represented by double dots NOTE in some instances the XML schema definitions may differ from those shown In particular a featureCode attribute is mandatory on all topographic feature types but to harmonise the definition of core attributes with other layers it is defined as optional within the XML sch
82. association OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 52 of 142 Chapter7 Change management and data association This chapter provides an introduction to two aspects of deriving additional value from OS MasterMap Topography Layer The first is utilising the referencing and change tracking attributes to identify and manage the impact of change on a customer s data It discusses the process of applying change and the implications for archiving data The second is associating customer data and OS MasterMap Topography Layer through the use of the TOID as a common reference This creates the potential to share data between departments and organisations It explains what data association is and it gives examples of how data association can bring benefits to organisations As both these subjects have guite complex issues surrounding them in terms of the systems needed to support them they are discussed in finer detail in a number of topic specific documents that are available from the following links These are e DNF website e Implementing OS MasterMap technical information sheet 1 Change management The feature reference and change tracking attributes provide the opportunity for customers to put in place a change management regime The system that the customer uses to translate and load OS MasterMap Topography Layer should use the TOID and version information to update the local holding when a COU is
83. attribution The attribution of OS MasterMap Topography Layer provides information about both the feature s real world counterpart and metadata about the feature itself The next chapter describes the key features of the supply of OS MasterMap Topography Layer OS MasterMap Topography Layer user guide chapter 5 v1 9 12 2010 Crown copyright Page 45 of 142 Chapter6 OS MasterMap supply An online service to supply OS MasterMap has been created All OS MasterMap Topography Layer orders are supplied from a master copy held in a database by Ordnance Survey The information the customer submits through the online service to define the area and supply options form the criteria for a database query This query is run on the database to extract the data the customer requires The main features of the supply system are outlined in this section The OS MasterMap Topography Layer themes cannot be purchased separately Customers may opt to have a theme excluded from the supply Online ordering OS MasterMap incorporates a web based ordering system that allows the customer to order initial data supply and update obtain price estimates and view details of their holdings on demand GML format and schemas OS MasterMap Topography Layer is available in GML format version 2 1 2 GML was developed by the Open Geospatial Consortium OGC a global organisation of developers and users that aims to maximise the benefit of GI GML is a spatially enabled dialect
84. b physicalLevel gt 50 lt osgb physicalLevel gt lt osgb polygon gt lt gml Polygon srsName osgb BNG gt lt gml outerBoundaryIs gt lt gml LinearRing gt lt gml coordinates gt 446177 050 108565 150 446178 400 108561 850 446181 750 108563 350 446185 100 108555 550 446202 000 108563 050 446219 650 108532 080 446224 800 108523 050 446230 400 108525 750 446229 000 108525 500 446228 800 108525 600 446228 600 108525 750 446228 500 108525 850 446228 300 108526 000 446228 150 108526 100 446228 000 108526 300 446227 600 108526 750 446227 300 108527 150 446227 000 108527 600 446226 800 108528 050 446226 650 108528 150 446226 300 108528 850 446224 800 108531 600 446224 300 108532 600 446223 800 108533 950 446222 950 108535 600 446221 050 108539 500 446218 400 108545 700 446215 200 108553 600 446210 000 108565 850 446206 350 108564 350 446202 900 108572 900 446206 450 108574 350 446203 650 108581 100 446195 550 108577 600 446197 600 108572 900 446191 800 108570 300 446191 400 108571 100 446184 400 108567 900 446182 650 108571 850 446175 600 108568 650 446177 050 108565 150 lt gml coordinates gt lt gml LinearRing gt lt gml outerBoundaryls gt lt gml Polygon gt lt osgb polygon gt lt osgb TopographicArea gt lt osgb topographicMember gt 2 The deletion of this feature is given in the COU file through reference to its TOID lt osgb departedMember gt lt osgb DepartedFeature fid osgbl000002039092674
85. both the location and the geometry of the real world object Points do not necessarily represent the exact geometry of the real world object just the centroid of its location Text features are used to provide additional information and context about real world objects represented by point line or polygon features They are represented as a point which indicates the location where the text should be displayed Polygon features fit with each other topologically within structuring layers This means that polygons sit adjacent to each other like pieces of a jigsaw puzzle rather than on top of each other In figure 8 below it can be seen that a building if removed leaves its footprint in the land feature the land feature does not exist below the building Figure 8 OS MasterMap polygons It should be noted that OS MasterMap Imagery Layer is not part of the feature model as it does not contain individual features but instead provides a seamless source of orthorectified aerial photography that can be visually related to the other layers in OS MasterMap Attributes Each feature comes with an extensive set of attributes that provide information about the feature for example its identity its relationship to other features geometry and the kind of real world object it purports to represent Each type of feature has a different set of attributes There are two types of attribute information Some attributes provide data abou
86. but complementary layers that provide detailed topographic cartographic administrative address aerial imagery and road network features positioned on the National Grid The key characteristics of the product and why they are of benefit to customers are listed below Individual real world topographic features represented by points lines and polygons each with their own unigue reference called a TOID A set of addresses both postal and geographic each with their own TOID with a geographic coordinate and cross referenced to physical features within OS MasterMap and to other address references A structured network representing the road system and routing information related to it that may affect a driver s choice of route with each feature having its own TOID Seamless orthorectified aerial images of Great Britain taken at a resolution of 25 cm being both geometrically accurate and colour balanced An online ordering system that allows the customer to order their area of interest with the option for online or media delivery of data Employing a scale of data capture appropriate to the density of features the higher the number of features within an area the larger the scale used to survey them ensuring the detail of individual features can be shown and with coordinates delivered in British National Grid There are over 460 million individual features within the OS MasterMap product family as a whole Developed managed
87. ce Area Step 10054 General Surface Line Step 10058 Glasshouse Area 10062 Glasshouse Line 10064 Glasshouse Point 10063 Glasshouse Symbol 10061 Glasshouse Text 10060 Height Control Area 10065 Height Control Line 10071 Height Control Point 10068 Height Control Symbol 10070 Height Control Text 10069 Height Control Point Bench Mark 10067 Height Control Symbol Bench Mark 10066 Historic Interest Area 10076 Historic Interest Line 10075 Historic Interest Point 10080 Historic Interest Symbol 10073 Historic Interest Text 10074 Historic Interest Text Compound 10077 Historic Interest Point Site Of Heritage 10072 Inland Water Area 10089 Inland Water Line 10087 Inland Water Point 10088 Inland Water Symbol 10084 Inland Water Text 10090 Inland Water Text Compound 10086 Inland Water Line Culvert 10092 Inland Water Point Culvert 10085 Inland Water Symbol Culvert 10091 Inland Water Symbol Direction Of Flow 10082 Inland Water Line Tunnel Edge 10083 Landform Area 10093 Landform Line 10095 Landform Point 10094 Landform Symbol 10106 Landform Text 10102 Landform Line Bottom Of Cliff 10103 Landform Line Bottom Of Slope 10097 Landform Area Cliff 10099 OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 83 of 142 Descriptive group Feature type
88. d for all of the information in OS MasterMap due to limitations of generic styling and cartographic information available for specific feature types Use of coordinates stroke widths and text sizes All coordinates in this chapter are specified in eastings and northings in units of metres in the British National Grid See chapter 7 Geometry and topology for further information Stroke widths and text sizes are also specified in units of metres on the ground Colour palette Ordnance Survey has chosen to use colours that are consistent in the Internet environment The particular colours used are defined with both their RGB and hexadecimal values in colour palette Text The fonts selected by Ordnance Survey to display text are those that are commonly used with web browsers A brief description as to how a font is used in SVG is given in the Fonts section Symbols There are two different uses of symbols as defined in the following sections A base symbol set is defined in the Shared Symbol Geometry section these may be aggregated to form compound symbols as defined in Compound symbols Patterns formed from repeating symbols on a predefined grid are specified in Pattern definitions Point symbols Point symbols are used to represent the position of particular features within the data such as a telephone call box or bollard The symbol represents the location and type of feature Point symbols are applied to the visual representation b
89. deleted and one or more new features created Alterations due to positional accuracy improvement PAI or any other error correction of Ordnance Survey data that is not related to real world change are treated as detailed in modification of line features due to error correction later in this chapter Changes to geometry of polygon features When a real world polygon object expands or contracts due to alteration to its boundaries yet is considered to be the same real world object the corresponding feature is retained with an unchanged TOID For example the polygon feature representing the back garden of a residential property is retained even if it is greatly reduced or increased in size through alterations done to the house This is because its identity as the representation of the garden of a particular property means it can be considered the same feature despite extensive changes to its geometry If it is not clear whether the real world object after modification is the same object or a new one the following considerations are used as a guideline e Is there topographic information to suggest the function of the resultant real world object is the same as that of the original e Is the resultant real world object more than half the size and less than twice the size of the original e Does the majority of the extent of the resultant real world object lie within the bounds of the original e Is the resultant real world object the obvious logica
90. display a text string in harmony with the underlying map detail and consists of anchorPosition font height and orientation Attribute metadata A few attributes have associated metadata that provides extra information about some aspect of the attribute These attributes are as follows Metadata Values Description Attributes broken true false Indicates that there is a problem polyline polygon with the geometry See chapter 7 Geometry and topology for details The default value for this is false srsName osgb BNG Specifies the reference system of point polyline and polygon the geometry types British National Grid OS MasterMap Topography Layer technical specification chapter 5 v1 9 12 2010 Crown copyright Page 79 of 142 Chapter 6 Attribute values Attribute values accuracyOfPosition Value Description 1 0m Urban data capture standards 1 1250 scale This is the nominal accuracy of a point position at the 9995 confidence level 2 5m Rural data capture standards 1 2500 scale This is the nominal accuracy of a point position at the 99 confidence level 6 0m Rural overhaul data capture standards This is the nominal accuracy of a point position at the 99 confidence level This is the accuracy to be expected in areas of original 1 2500 scale overhaul mapping that have not been subject to positional accuracy improvement 8 0m Mountain and moorland data capture standards 1 10 000 scale This
91. ducing the relevant TOID as one of the attributes In addition to the documents mentioned at the beginning of this chapter on data association further assistance on change management and data association is available from Ordnance Survey s Pre and Post Sales Support team that can be contacted via the numbers given in the preface to this document This chapter has provided an introduction to managing change and utilising the unique reference to gain more value from the data by associating datasets together Both these subjects are covered in more depth in the documents referred to in this chapter and customers are encouraged to explore these issues more fully through these resources and to liaise with system suppliers about how they might adopt some or all of these practices The next chapter looks at how more value can be derived from OS MasterMap Topography Layer by using the attribution to apply different styles OS MasterMap Topography Layer user guide chapter 7 v1 9 12 2010 Crown copyright Page 55 of 142 Chapter8 Style guide Ordnance Survey has produced a style guide for OS MasterMap This is a distinct set of colours fill styles and symbols The styling has been developed using a combination of three of the descriptive attributes descriptive group descriptive term and make A full description of the styling is available in the technical specification Providing a style guide has allowed many software providers to develop their own
92. e A barn is converted into a private dwelling There is no change to the nature of the building it is still a building and the feature is retained OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 23 of 142 Modification of polygon features due to error correction When a polygon feature is changed solely to correct errors either in geometry or other attributes then the feature is retained If the feature has been moved to correct an error and simultaneously modified for real world change for example when natural movement of a physical feature occurs such as a river bank or foreshore then the feature modification rules above are followed Examples e Aline feature representing an old fence is found to have an error in its position and is corrected The line feature and the polygon features bounded by it are retained The version numbers of the features involved are incremented e The feature representing an area of road has been assigned an incorrect descriptive group The feature is reclassified and retained The feature version number is incremented e An area of non coniferous trees has been incorrectly assigned the descriptive term coniferous trees by photogrammetric revision techniques The feature is reclassified and retained The feature version number is incremented e A building foundation captured as a feature with descriptive group of unclassified is completed and the feature is
93. e customer has not taken To ensure that departed features are dealt with properly within a holding it is important to load all the COU files all in one go or session If a customer processes COU chunk files one at a time deleting all departed features from the data holding it is possible that the software might be deleting some features that should still exist because they are departed from one chunk and modified in another This problem can be avoided by the loading software making two passes through the set of COU files the first pass resolving departed features from all chunk files and the second pass applying new or modified features from all chunk files File names Each OS MasterMap chunk file supplied except Imagery and non geographic chunks has the following format nnnnnn LLnnnn nnlnnnn for example 123456 SU1212 2i3 This example is broken down as follows 123456 is the order number SU1212 is the 1 km square in which the south west corner of the chunk falls 2 is the chunk size in this case 2 km by 2 km this will be set to 5 for 5 km by 5 km or 10 for 10 km by 10 km OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 51 of 142 The i is a flag indicating that the data selection polygon does not completely fill the chunk sguare that is the chunk is incomplete If it does this will be shown as a c If an area selection contains no data then an empty chunk file
94. e resupply is that if taken regularly the amount of data that has to be loaded is much smaller Users may reguest updates of the latest changes in their area of interest at any time using the online service It is also possible to set up a schedule for supply It is possible to assign a regular date for receipt of COU These will then be sent automatically on the reguired media or placed on the file transfer protocol FTP server for collection A customer can specify the area of interest to be updated by defining a data selection polygon around the features reguired This can be done by selecting predefined areas and by importing tile lists or vector polygons although some restrictions apply Customers are advised to contact the Customer Service Centre for further information on importing vector polygons Currently change comes through on a minimum six week cycle Both initial supply and updates are available on CD DVD and via a FTP server although the FTP server is limited to an order volume of 400 Mb For initial supply it is recommended that customers select CD or DVD single sided 4 6 Gb due to the larger volumes of data involved This data is designed to be kept up to date via an online COU Files containing initial supply and COU update supply should never be translated together in the same session nor should more than one COU supply be translated at a time For those customers taking other layers along with the OS MasterMap Topography
95. e use of the Arial font for Ordnance Survey s standard depiction of text string Within the XSL file the text colour is dictated by the descriptiveGroup as is the use of italics The textRendering complex attribute for a CartographicText feature contains information on the placement orientation and height for rendering the text NOTE a font value of 0 1 2 or 3 as used in Land Line is also provided that can optionally be used for depiction The suggested fonts for cartographic display are 0 Lutheran used for non Roman antiguities 1 Normal medium Roman font 2 Light Roman font used primarily for building numbers Roman antiquities and some administrative names particularly in 1 10 000 areas 3 Suppressed text not supplied in Land Line due to space limitations Shared symbol geometry boulderGeometry lt polyline points 0 154 0 236 0 111 0 365 0 116 0 501 0 165 0 616 0 170 0 627 0 264 0 724 0 490 0 826 0 682 0 889 0 885 0 900 1 083 0 858 1 264 0 767 1 415 0 631 1 521 0 466 21 558 0 199 1 538 0 071 1 462 0 329 l 333 0 566 1 156 0 771 gt lt polyline points 1 755 0 819 1 534 0 804 0 832 0 857 0 129 0 824 0 450 0 769 1 032 0 767 1 612 0 819 gt lt polyline points 1 640 0 804 1 620 0 589 1 392 0 388 1 122 0 248 gt lt polyline points 0 311 0 526 0 520 0 573 0 732 0 554 0 930 0 472 1 093 0 335 1 097 0 329 1 101 0 323 1 105 0 317 1 108 0 311 1 11
96. eature is found to be incorrectly attributed due to an error or is moved due to the correction of a positional accuracy error the original feature is retained and appropriately modified This chapter has explained in some detail the life cycles of features so that customers can understand how the data is managed by Ordnance Survey The next chapter focuses on the content of themes OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 26 of 142 Chapter 4 OS MasterMap Topography Layer themes This chapter describes in more detail the content of each theme This will aid customers understanding of which features they can find in the data and the most likely theme or themes that the feature will be found in OS MasterMap Topography Layer comprises nine themes To recap these are e Administrative boundaries e Buildings e Heritage and antiquities e Land e Rail e Roads tracks and paths e Structures e Terrain and height e Water The main features of each theme are described below As stated earlier in chapter 3 there are rules that govern which theme or themes are assigned to a feature These are discussed later in this chapter Wherever possible real world objects are represented in their true surveyed position For the sake of clarity of display or plotting real world objects may be generalised for example small juts in house fronts may not be shown The normal methods of generalisation that ca
97. ection plane defined by a set of geometric rings that represent the boundaries A polygon has one outer boundary and zero or more inner boundaries holes in the polygon The inner boundaries must not cross each other or contain other inner boundaries Coordinates in outer boundaries are oriented in an anticlockwise direction coordinates in inner boundaries are oriented in a clockwise direction Example BNG 176579 205 987663 345 BNG 176554 565 987654 545 BNG 176575 685 987654 545 00 0 0 EU OS MasterMap Topography Layer technical specification chapter 7 v1 9 12 2010 Crown copyright Page 90 of 142 Example class model outerBoundary GYG ising fromBNG Ee from BNG M 0 innerBoundary e Topological structuring layers Within the Topography Layer there are four topological structuring layers that determine how features interact A structuring layer contains features that do not cut across each other and are permitted to connect to each other spatially sharing common geometry at their edges For example most topographic features participate in a single topological structuring layer but features that are underground or above cartographic level or that represent pylons cliffs and slopes are not considered to interact with other features in the topography structuring layer During capture and maintenance of the data processe
98. ed on the W3C XLINK recommendation provided by the OGC to make use of the XLINK constructs The Ordnance Survey application schemas are e OSDNFFeatures xsd the definition of the Ordnance Survey features and their properties e OSComplexTypes xsd the complex property types including changeHistoryType e OSSimpleTypes xsd the basic property types including descriptiveGroupType and accuracyOfPositionType e OSMeasures xsd the definition of measure gualified types used in OS MasterMap data e OSGueryresult xsd the definition of a query result with its properties e OSGeometryTopology xsd geometry and topology extensions to the GML 2 1 2 specification required by Ordnance Survey including rectangles and polygon topology XML namespaces xlink http www w3 org 1999 xlink gml http vww opengis net gml osgb http www ordnancesurvey co uk xml namespaces osgb xml http www w3 org XML 1998 namespace OS MasterMap Topography Layer technical specification chapter 9 v1 9 12 2010 Crown copyright Page 99 of 142 Chapter 10 Cartographic styling This chapter provides a guide to applying styles defined in annexe C Cartographic style definitions to Topography Layer features As landform features and pylons sit on top of topographic areas they need to be above these in the draw order to be visible There is not a style provided for every feature so some features are not drawn when the default styling i
99. edMember gt C HN NNNNNNNNHDD OS MasterMap Topography Layer technical specification chapter 9 v1 9 12 2010 Crown copyright Page 98 of 142 XML schema Schema overview and Internet location XML schemas are used to validate the format and content of the GML The GML 2 1 2 specification provides a set of schemas that define the GML feature constructs and geometric types These are designed to be used as a basis for building application specific schemas which define the data content The Ordnance Survey application schemas that are referenced by the data are available from our website at http Www ordnancesurvey co uk xml schema These schemas make use of XML Schema Definitions XSDs and Document Type Definitions DTDs produced by the W3C that are available from the W3C website at http www w3 org XML 1998 namespace html NOTE some recent parsers now fail to validate OS MasterMap using these schemas as working practices and XML schema specification clarifications have led to GML 2 1 2 being rendered invalid Schema descriptions The W3C provided XSDs and DTDs are e xml xsd to allow the use of the xml lang attribute for language qualification e XMLSchema dtd required by xml xsd e datatypes dtd required by XMLSchema dtd The OGC provided schemas are e feature xsd the feature and property constructs e geometry xsd the geometric constructs such as polygon and point e xlinks xsd a schema bas
100. eightSymbol Tidal Water waterPointSymbol RN OS MasterMap Topography Layer technical specification chapter 10 v1 9 12 2010 Crown copyright Page 103 of 142 CartographicText descriptiveGroup descriptiveTerm Style hex value Font style Buildings Or Structure 000000 Normal Built Environment Compound 000000 Normal General Feature 000000 Normal General Surface 000000 Normal Height Control Bench Mark 000000 Normal Historic Interest 000000 Italic Inland Water 0099FF Normal Landform 000000 Normal Political Or Administrative FFOOFF Normal Rail 000000 Normal Road Or Track Road Name Or Classification 000000 Normal Roadside 000000 Normal Structure 000000 Normal Terrain And Height 000000 Normal Tidal Water Foreshore 0099FF Normal Tidal Water 0099FF Normal CartographicSymbol descriptiveGroup descriptiveTerm Style from style guide Height Control Bench Mark benchMarkSymbol Inland Water Culvert culvertSymbol Inland Water Direction Of Flow flowArrowSymbol Political Or Administrative Boundary Half Mereing boundaryMereingChangeSymbol Road Or Track Road Related Flow roadFlowSymbol Rail Switch railwaySwitchSymbol RN OS MasterMap Topography Layer technical specification chapter 10 v1 9 12 2010 Crown copyright Page 104 of 142 Chapter 11 Data supply service The OS MasterMap Topography Layer product is su
101. eletion of line features When a real world object is no longer present in the real world the corresponding line feature is deleted from the Ordnance Survey main holding A record is kept in the database to indicate that a feature with this TOID used to exist Customers with local holdings of OS MasterMap data are informed of the deletion in their next COU OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 25 of 142 Modification of line features due to real world change As noted above a line feature may be modified due to changes to the real world object or due to changes in adjacent real world objects The original feature may be retained if a portion of its geometry remains and one or more new features may be created to reflect the change If the classification attributes of a line change then it will usually be retained and the version number incremented Occasionally a line feature may be replaced with a seemingly identical line feature that is considered a new feature An example of this would be where a line is created to represent a newly erected fence placed along the alignment of an existing line boundary between a garden and the pavement Modification of line features due to error correction When a line feature is changed solely to correct a surveying or cartographic error the feature is retained unless the resulting topological changes with adjacent features make this inappropriate General
102. ema TopographicArea Attribute Occurrence TOID featureCode version versionDate theme calculatedAreaValue changeHistory descriptiveGroup descriptive Term make physicalLevel physicalPresence polygon lo l lo lo j j ea a Iech Sab OS MasterMap Topography Layer technical specification chapter 4 v1 9 12 2010 Crown copyright Page 71 of 142 TopographicLine Attribute Occurrence TOID featureCode version versionDate theme accuracyOfPosition changeHistory descriptiveGroup descriptive Term nonBoundingLine heightAboveDatum heightAboveGroundLevel make physicalLevel physicalPresence polyline a e a a sch A O O GGGl O lh lech 1 sch lech it Iech IA BoundaryLine Attribute Occurrence TOID featureCode version versionDate theme accuracyOfPosition changeHistory descriptiveGroup descriptive Term physicalLevel physicalPresence polyline l l ol l IA lech lech lh Ich Ich a NOTE there is only ever one descriptiveGroup with the value of Political Or Administrative on a BoundaryLine feature This is defined as multiple in the schema because the definition is shared by all feature types OS MasterMap Topography Layer technical specification chapter 4 v1 9 12 2010 Crown cop
103. en it is not possible to access the data through a screen OS MasterMap Topography Layer user guide chapter 8 v1 9 12 2010 Crown copyright Page 57 of 142 Chapter 9 Table 5 Definitions of data measures Data measures Ordnance Survey measures the data in its products in one or more of the ways set out in table 5 below Data measure Definition Sub measure Definition Completeness Presence and Omission Features representing objects that conform absence of to the specified data content but are not features against present in the data th ifi t EF S Soe oan Commission Features representing objects that do not content E conform to the specified data content but are present in the data Logical Degree of Conceptual How closely the data follows the conceptual consistency adherence to logical rules of data structure attribution and relationships consistency rules or model Domain consistency How closely the data values in the dataset match the range of values in the dataset specification Format consistency The physical structure syntax how closely the data stored and delivered fits the database schema and agreed supply formats Topological consistency The explicit topological references between features connectivity according to specification Positional Accuracy of the Absolute accuracy How closely the coordinates of a point in the acc
104. entifies the physical location of the car park If the TOID is introduced as a unigue reference and the data is stored within a GIS and or spatial database system the data can be gueried using the TOID as the search criteria Each department would be able to find all the available information on the car park in any record that had the same TOID as an attribute Finance data Ref no CPSS3456 SS Tourism data Spaces 200 we Ref Grosvenor Car Park Rate 1 00 P H Open All year Average annual revenue 500 000 m i Times 07 00 23 00 Nearest attractions Theatre Art gallery TOID osgb1000000157011914 TOID osgb1000000157011914 Maintenance data Ref SURFACEGROS Resurface interval Five years Last resurface April 2005 Contractor J E Smith amp Sons Cost 25 000 Planned closures None TOID osgb1000000157011914 Figure 26 data association Organising the data in this manner offers the following advantages OS MasterMap Topography Layer user guide chapter 7 v1 9 12 2010 Crown copyright Page 54 of 142 This is a more efficient way of storing and accessing data as it requires only one attribute to be known and given the correct database structure may only require the TOID to be stored once It also means that any update to the information by one department will be immediately accessed by all other departments In the above example for instance if the parking rates were raised by finance the to
105. entify these dates in their holdings and to understand the difference between them if they want to be able to track changes One of the key differences between OS MasterMap features and other products is that with the correct data storage model a data holding can be rolled back and forward to a given point in time It must be emphasised though that this is the customer s responsibility since only the current version is available in the product none of the previous versions are included Life cycle rules The following sections set out the rules that define the life cycles of features in OS MasterMap Topography Layer By understanding how change is defined and recorded within the product customers can start to identify what kind of change has a bearing on their applications and develop their own management regimes Polygon feature life cycle rules The flowchart below in figure 12 shows the process followed whenever a real world object represented as an OS MasterMap polygon feature appears changes or is removed from the physical environment The rules are described in more detail in the following sections particularly the guidelines used to answer the guestion in the centre of the flowchart Removed real world object Changed real world object New real world object Is it still the same real world object No Retain feature Delete feature update version number Create new i Delete feature feature
106. ents of each theme It explained how Ordnance Survey allocates a feature to one or more themes This helps the customer to understand which theme a feature is likely to be found in and also why some features may appear in a theme that may not seem logical on first appearance The next chapter discusses the types of geometry used to represent features and the attributes that come with each feature type OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 39 of 142 Chapter5 OS MasterMap Topography Layer feature types and attribution Each OS MasterMap Topography Layer feature is represented as either a point line or a polygon These three types are further divided into six feature types to give a further refinement to reflect the different types of geographic or non geographic function the line point polygon or text represents Point features There are three types of point feature e Topographic point features that represent topographic detail and spot heights e Cartographic symbol point features that store information about the location and type of symbology used when rendering OS MasterMap graphically e Cartographic text point features that define the content and placement of text when rendering OS MasterMap graphically Line features There are two types of line feature e Topographic line features representing topographic information and inferred topographic area boundaries such as polygon closin
107. erMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 9 of 142 Average file sizes for the four imagery formats are e TIFF 46 Mb e ECW 2 2 Mb e JPEG 2 7 Mb e MrSID 2 2 Mb Additional space should be allowed for metadata and registration files The minimum system requirements to use the OS MasterMap online service are detailed on the Ordnance Survey website For further information on the technical implications of implementing OS MasterMap please see Information sheet 3 Technical implications from the implementing OS MasterMap series of documents from the Ordnance Survey website Gaelic or Welsh names are also supported A character set is available The data model OS MasterMap vector products have a hierarchical structure The highest level of the structure is the layer Within each layer can be a series of themes Within each theme there will be features deemed to belong to that theme A feature can belong to more than one theme This model is extensible at all levels New layers can be added to OS MasterMap New themes can be added to layers New features can be added to themes Each feature will have one or more versions of itself that demonstrate change to that feature over time New versions of features replace existing features Features that no longer exist can be deleted The rest of this chapter discusses the main features of the first level of the model the layer and introduces the concepts of t
108. erlay to achieve a multicoloured result Styles have been defined in this way to produce effects like lines with outlines This chapter defines the two components as separate styles For example a minor road is first drawn as a black background carriagewayOutline that is then overlain with a yellow foreground minorRoadLine as below The line styles are defined in Line styles Colour palette Hex r g b Style name 000000 0 0 0 333333 51 51 51 0000CC 0 0 204 FF0000 255 0 0 009966 0 153 102 666666 102 102 102 669966 102 153 102 FF0099 255 0 153 FF9900 255 153 0 0099FF 0 153 255 00CCFF O 204 255 999999 153 153 153 FFD7C3 255 215 195 structureFill DCDCBE 220 220 190 heritageFill 66CCCC 102 204 204 FFFFOO 255 255 0 FFOOFF 255 0 255 D2D2AA 210 210 170 madeSurfaceFill stepFill D7D7D7 215 215 215 roadFill CCCCCC 204 204 204 pathFill railFill FFDCAF 255 220 175 buildingFill FFCC99 255 204 153 glasshouseFill D2FFB4 210 255 180 naturalSurfaceFill DCFFBE 220 255 190 naturalEnvironmentFill BEFFFF 190 255 255 inlandWaterFill tidalWaterFill FFFFCC 255 255 204 multipleSurfaceFill FFFFFF 255 255 255 unclassifiedFill OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 117 of 142 Fonts The gml2svg xsl declares th
109. erty element For example lt osgb textRendering gt lt osgb anchorPosition gt 4 lt osgb anchorPosition gt lt osgb font gt 2 lt osgb font gt lt osgb height gt 24 lt osgb height gt lt osgb orientation gt 3476 lt osgb orientation gt lt osgb textRendering gt lt osgb heightAboveDatum gt lt osgb heightAboveDatum gt 3456 lt osgb heightAboveDatum gt lt osgb accuracyOfPosition gt 2 0m lt osgb accuracyOfPosition gt lt osgb heightAboveDatum gt COU COU requires that information be provided for features that were present in a spatial query but no longer meet the query criteria Such features may have changed theme so that they are no longer in any of the themes being requested had their geometry modified between queries so that they no longer meet the spatial criteria or been deleted These features are represented using the DepartedFeature feature type These are encoded the same way as other features For example lt osgb departedMember gt lt osgb DepartedFeature fid osgbl000000334379755 gt lt osgb boundedBy gt lt gml Box srsName osgb BNG gt lt gml coordinates gt 278543 400 187665 800 278545 900 187666 450 lt gml coordinates gt lt gml Box gt lt osgb boundedBy gt lt osgb theme gt Roads Tracks And Paths lt osgb theme gt lt osgb reasonForDeparture gt Deleted lt osgb reasonForDeparture gt lt osgb deletionDate gt 2005 07 16 lt osgb deletionDate gt lt osgb DepartedFeature gt lt osgb depart
110. es all themes Figure 19 the depiction of water and bridges water theme only Theme rules There are a number of rules that govern what theme or themes are assigned to a feature These rules give the data consistency so that the same kind of real world objects is assigned to the same themes as far as possible Attributes are discussed in detail in the next chapter but there is one attribute called the descriptive group attribute that has a major bearing on the theme rules The value in the descriptive group is the key determinant of which theme s the feature is assigned Table 3 below relates the value of descriptive group of which there are 21 to the theme If the feature has the value listed in the first column it will be assigned into the theme listed in the third column OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 36 of 142 Table 3 Value of descriptive Description of value Theme Examples group attribute Building Features representing buildings Buildings Houses barns and not including glasshouses factories Buildings or structure Text features describing or Buildings Houses barns and naming buildings and structures factories Built environment Geographic areas and extents Land Residential land car of man made environments parks agricultural land terrain and communication links slopes cliffs and quarries Genera
111. es and topographic relief and therefore results in an image having the same geometric properties as a map projection overhead level Features that exist above the ground surface level are defined as overhead detail Examples of overhead features include electricity transmission lines ropeways gantries ski lifts and some pipelines This does not include bridges which are classified as cartographic surface level Overhead features such as pipes within an industrial installation are not shown where they form an integral part of that installation Depiction of overhead features entering such installations is terminated at the first support or building within the perimeter parallel features Where a fence hedge or wall runs approximately parallel to another feature and so close that they cannot both be plotted correctly at scale of survey then only one feature is shown in OS MasterMap In determining which feature to include the following hierarchy is used by the surveyor e_ include if the feature is used to mere an administrative boundary e_ include if the feature appears to define the extent of a property and e_ include if the feature appears more important for example if there is a hedge next to a cattle protection fence show the hedge permanent detail Permanent detail is defined as physical features that it is reasonable to assume will remain in position for at least 10 years taking into account the nature of construction or char
112. escriptiveTerm Bottom Of Slope or descriptiveGroup Landform and then apply landformLine descriptiveTerm Bottom Of Cliff or descriptiveTerm Parish then apply parishLine or descriptiveTerm Electoral then apply electoralLine or descriptiveTerm County then apply countyLine or descriptiveTerm Parliamentary then apply parliamentaryLine or descriptiveTerm District then apply districtLine or physicalPresence Edge Limit then apply defaultDashedLine or physicalPresence Closing then apply closingLine Else apply defaultLine TopographicPoint descriptiveGroup descriptiveTerm make Style name General Feature Positioned Nonconiferous Tree Natural positionedNonconiferousTreeSymbol General Feature Positioned Coniferous Tree Natural positionedConiferous TreeSymbol General Feature Positioned Boulder Natural positionedBoulderSymbol Historic Interest Site Of Heritage heritageSiteOfSymbol Historic Interest Structure pointSymbol Inland Water Manmade waterPointSymbol Landform Manmade pointSymbol Landform Disused Feature Natural landformDisusedSymbol Landform Natural pointSymbol Political Or Administrative Boundary Post Or Stone boundaryPostSymbol Rail Structure pointSymbol Roadside pointSymbol Structure Manmade pointSymbol Structure Structure Manmade pointSymbol Structure Triangulation Point Or Pillar Manmade triangulationStationSymbol Terrain And Height Spot Height spotH
113. ess addressed premises A permanent or non permanent location with an address being a potential delivery point for Royal Mail Examples of addressed premises are a house a flat within a block of flats a caravan site a bollard to which several houseboats may be moored or an organisation occupying the whole or part of a building area of interest The spatial extent that a customer has access to for a specific product This area of interest may include a number of different spatial extents associated data A dataset held by third parties that has been linked to features within OS MasterMap by means of identifiers TOIDs attribute Any item of information packaged in an OS MasterMap feature The TOID and the geometry of the feature are both attributes of the feature In GML and XML documents and specifications this term is used in a different way This usage is noted in the OS MasterMap specification as appropriate attribute set A group of attributes that can legitimately and logically be used together Each feature type uses a particular attribute set cartographic surface level Where one level of detail exists cartographic surface level is the same as general surface level Where more than one level of detail exists the cartographic surface level is defined as the upper surface level of surveyed detail All features surveyed at levels below cartographic surface level are captured using obscured detail or underground detail feature codes
114. etric attributes of OS MasterMap Topography Layer features Each feature type has a spatial attribute shown in the second column The data type of this attribute is given in the third column of the table For full details of the feature types and their attribute sets see chapter 4 Feature attribution Feature type Spatial attribute Data type of attribute TopographicArea polygon Polygon TopographicLine polyline Polyline or Multiline BoundaryLine polyline Polyline or Multiline TopographicPoint point Point CartographicSymbol point Point CartographicText anchorPoint Point The following sections give more information on these data types Coordinate reference systems The GML specification provides for the use of a variety of coordinate reference systems At present only the British National Grid BNG is used in OS MasterMap British National Grid BNG The BNG spatial reference system uses the OSGB36 geodetic datum and a single Transverse Mercator projection for the whole of Great Britain Positions on this projection are described using easting and northing coordinates in units of metres The BNG is a horizontal spatial reference system only it does not include a vertical height reference system In OS MasterMap data heights are given by real valued feature attributes that are separate from the geometric feature attributes such as point polyline and polygon The geometric attributes therefore contai
115. etry of a line feature is a polyline an ordered string of points A particular line feature will often represent only part of an object For example a line feature may represent a linear entity for example part or all of a fence the boundary of an area for example a house or both for example a fence around a field local holdings The situation where a customer has to hold and manage data that is supplied to them make An attribute indicating whether the land surface is natural or man made media supply See offline supply metadata Graphical or textual information about the content guality condition origins and characteristics of data National Geographic Database The source of data for Ordnance Survey s products National GPS Network The infrastructure of active and passive GPS reference stations that allow surveyors to determine precise coordinates in GPS and British National Grid spatial reference systems The National GPS Network provides the physical definition of the British National Grid the primary spatial reference system used in OS MasterMap A central component of the Digital National Framework National Grid A unigue referencing system that can be applied to all Ordnance Survey maps of Great Britain at all scales It provides an unambiguous spatial reference for any place or entity in Great Britain object based data Data in which one whole feature or a collection of whole features represents one real wor
116. euu LLY LLI I LL LLGC LL LLGC LL LLALL LLCC CCG LL LLGC LLCC LL LLGC i es LLI IL I LLI Please record your comments or feedback in the space below We will acknowledge receipt of your form within three 3 working days and provide you with a full reply or a status report within 21 working days If you are posting this form please send it to OS MasterMap Topography Layer Product Manager Ordnance Survey Adanac Drive SOUTHAMPTON SO16 0AS If you wish to return it by fax please dial 44 0 8450 990494 Any personal information that you supply with this report form will be used by Ordnance Survey only in the improvement of its products and services It will not be made available to third parties OS MasterMap Topography Layer user guide annexe D v1 9 12 2010 Crown copyright Page 62 of 142 OS MasterMap Topography Layer Technical specification Contents Section Introduction Chapter 1 Chapter 2 Chapter 3 Chapter 4 Chapter 5 Chapter 6 Chapter 7 Page no N 66 Purpose of this specification and disclaimer cccccccecssecececsneeeeecsneeeeesseeeescsaeeeesesteeeesaaes 66 Copyright in this specification sssssssssssseseeneneneneen ennemis 66 Key canbeDls secco xn x minu EE ERE DIM E MEIN ee eee 67 Feature model ci ieu Eum 67 Feature life cycles 3 exu a Add EE 67 Integration of the OS MasterMap layers YY LLLYL LLY
117. f line features due to error correction ccccceeeeeeeeeeeeeeeeeseeeeeseeeesneeeeees 26 General point feature life cycle rules ee u uuunnsn si HYLL LLALL LARLL emen 26 Creation of point features cnet ierunt nd eee nae nena nnus aad oaa na en raa aen inan aio 26 Deletion of point features cer derer re eere diee ava Lo gre va te ARON YY aY dao 26 Modification of point features due to real world change 26 Modification of point features due to error correction cccceeccccccceeceesseaeceeeeeeeesensaees 26 OS MasterMap Topography Layer themes eee 27 Administrative boundartes enne LEL EL trennen nennen 27 OS MasterMap Topography Layer user guide contents v1 9 12 2010 Crown copyright Page 2 of 142 Chapter 5 Chapter 6 Chapter 7 Chapter 8 Chapter 9 Annexe A Annexe B Annexe C Annexe D Parliamentary boundaries YY YL ALL LLY LLL LLALL ttnt EnEn EnS REY ELLYLL LLA HY nn nno 27 Local government boundaries cece eetree LLA LLY eet nett eee tiene ee ALLE LL HL E LL REED nannten nanena 28 Application of precedence LIII LLY LLI LEL L enne enne nnne nns 28 tel ue E 29 Heritage and antiquities rn in Y eee etter eee LEL eee atte eee HY nennen nnne nenne nennen 29 land GR tees GU RO DAFOD DIY OND 30 IRall cedo e TAD Y A MYD GW ATAD th tanec at ODAU 31 Roads tracks and paths ELE L Y LLE LL LLE LLC LEL L LL LLGC LL YL ALED LL AL LLAC nn nnn NL AL rh NL FL YL FFY FF raa esena
118. fect when the data selection polygon crosses a grid square twice two or more separate chunks are created System suppliers are able to advise the best chunk rates for their systems A consequence of this is that some features are supplied in more than one chunk Systems reading OS MasterMap data must identify and provide the option to remove these duplicated features Empty chunks are not supplied that is if a chunk contains no information relating to a customer s selected themes then it would be an empty file so it is not supplied Chunks cannot be treated as persistent data management units as it is a floating grid the origin of the chunking grid may differ between orders particularly if the contract area changes or if they order a different chunk size Supply of OS MasterMap Topography Layer features in chunk files The packaging of a seamless dataset into chunks means that where a feature lies across or touches a boundary of a chunk or chunks it is supplied in all of the chunks This is because the individual feature is the smallest unit within OS MasterMap Topography Layer it cannot be physically split into two or more parts OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 48 of 142 When a polygon falls across a chunk edge but its bounding line or lines lie outside it may not be included in that chunk It will be included in the adjacent chunk unless the polygon is at the edge of t
119. fiers to relevant features in other datasets one or more postal addresses a coordinate position on the British National Grid one or more classifications and information on how and when that feature has changed Figure 5 shows the addresses symbolised as letters and displayed in geographic relationship to each other The third address product is the Prebuild Address Layer that provides consistent and comprehensive advance address information for England Scotland and Wales It identifies future builds and their approximate spatial location across Great Britain ZA Se AA LX n AA AA ZA La yN ZA La am ZA La FA ZA ZA mA ZA AA Aa ZA ZA ZA A LEX sei ram gt AA Za A m 3 AA ZA Ey ae 53 Aa ZA A ES NN m A a ZA CN A Aa A ZA FA A e 53 Aa 53 9 FX FA ZA lo ZA La os 93 93 CN A 53 ZA ZA ZA ZA 73 Fa La eX EX A ZA 9A ao m ZA ZA yN e Figure 5 OS MasterMap Address Layers OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 11 of 142 Integrated Transport Network ITN Layer OS MasterMap includes an ITN Layer that currently contains the Roads Network and Road Routing Information information that may affect a driver s choice of route for Great Britain The Road Network is in geometric sympathy with the underlying topographic features and includes cross references between network components and the features in the Topography Layer that they intersect The Road Routing
120. fire and rescue service of the 21st century is not just about extinguishing fires It is about prevention as well as cure it is about assessing and managing risk it is about using resources in the most effective way to drive up standards and to increase service delivery levels According to Ray Hooper GIS Manager at London Fire Brigade We already have vast amounts of information about primary fires response times false alarms malicious calls and so on Our challenge is to make this available as widely and as promptly as possible for interpretation and action That is why we chose to implement a Cadcorp SIS based and brigade wide corporate desktop and Intranet GIS using OS MasterMap Read more at http Awww ordnancesurvey co uk oswebsite business casestudies pdf london fire brigade efficiency gains pdf OS MasterMap Topography Layer user guide annexe B v1 9 12 2010 Crown copyright Page 60 of 142 Annexe C Metadata ISO 19115 compliant UK GEMINI discovery level metadata is provided for the data and can be found on the Glgateway www gigateway org uk The following is a detailed description of the metadata elements that are provided on the Glgateway Title The title of the product Abstract The abstract gives a brief description of the product Currency The currency takes the form of date of last update for the feature Lineage The lineage metadata takes the form of product specification name and date of product specif
121. for example slopes or cliffs Features representing geographic areas and extents of natural environments and terrain OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 80 of 142 Value Description Network Or Features used to close polygons Polygon Closing Geometry Path Features representing and limiting the extent of pathways Political Or Features representing political or electoral boundaries Administrative Rail Features representing describing or limiting the extents of railways Road Or Track Roadside Structure Terrain And Height ground surface Tidal Water Unclassified descriptiveTerm Features representing describing or limiting the extents of roadways and tracks Features representing describing or limiting the extents of roadside detail Features representing describing or limiting structures other than buildings or glasshouses Features giving information about the altitude at a location or changes of level of the Features representing describing or limiting areas of water that are tidal Topographic features that have not been given a description yet The valid descriptiveTerm values appropriate to Topography Layer data are listed below descriptiveTerm Archway Bench Mark Bottom Of Cliff Bottom Of Slope Boulders Boulders Scattered Boundary Half Mereing Boundary Post Or Stone Buffer Cliff Compound Coniferous Tree
122. for non geo chunked files incrementing from 000001 Military grid lower left of the square The alternative for geo chunked files is the military grid reference of the lower left corner of the square Chunk size A number representing either geo chunked grid size for example 25 or the non geo chunked file size for example 30 Completion indicator Valid only for geo chunked data files c indicates complete coverage and i indicates incomplete coverage in the grid square Format type GML formatted data OS MasterMap Topography Layer technical specification chapter 11 v1 9 12 2010 Crown copyright Page 105 of 142 Full details will be found in the readme txt file accompanying the supply but example file names for the available options are as follows Ordered GML geo chunked 1234 SX2575 25c gz Ordered GML non geo chunked 1234 000001 30 gz National GML geo chunked SX2575 25 gZ National GML non geo chunked 000001 30 gz OS MasterMap Topography Layer technical specification chapter 11 v1 9 12 2010 Crown copyright Page 106 of 142 Annexe A Glossary The purpose of this chapter is to provide a glossary of terms used in the definition of products services licensing and other terms and conditions for OS MasterMap and OS MasterMap based products Where terms refer to other terms within the glossary they are connected by means of hyperlink to the relevant entries addr
123. g links e Boundary line features representing the boundaries of administrative areas Polygon features There is one polygon feature type e Topographic area features representing topographic information The value of assigning features to data types Assigning each feature to data feature type creates a logical way for GIS to handle the data and reflects how GIS typically like to handle geometric data by having separate tables for each geometric type There can be six separate smaller tables rather than one large table As there are different types of geometry and different types of features having different data types allows each type to have its own particular set of attribution It would not make any sense for example to have an attribution of a calculated area value for a line or point feature as these by their very nature do not have areas to measure By having this particular structure Ordnance Survey can provide more meaningful and more detailed attribution Attribution Each feature comes with a set of attribution Attribution provides additional information about the feature This information could relate to the real world object the feature represents or it could relate to the properties of the feature itself for example the theme the feature belongs to is an attribute as is the TOID The descriptive group is a property of the real world object the TOID is a property assigned to the feature This chapter explains each att
124. g relationship of any boundary alignment changes or where a boundary changes from one side of a real world object to another the point of change is shown by a boundary half mereing change symbol usually in opposing pairs The location of the boundary half mereing symbol is coincident with the boundary alignment and not the feature to which it is mered OS MasterMap Topography Layer user guide annexe A v1 9 12 2010 Crown copyright Page 59 of 142 Annexe B Case studies English Heritage English Heritage is the statutory adviser to the government on historic environment issues in England It protects and provides advice on the unigue legacy of historic buildings landscapes and archaeological sites It alSo manages over 400 sites welcoming in excess of 11 million visitors each year Read more at http Awww ordnancesurvey co uk oswebsite business sectors government central docs englishheritagecases tudy pdf Forestry Commission The Forestry Commission manages more than 1 000 000 hectares of public land mainly forests and woodlands on behalf of the governments in England Scotland and Wales The Commission is using its GIS together with digital mapping and geographical datasets from Ordnance Survey to improve the efficiency with which it carries out its activities Read more at http Awww ordnancesurvey co uk oswebsite products osmastermap layers topography casestudies forestryc ommission pdf London Fire Brigade The
125. given by Ordnance Survey about the product and or its suitability for any particular or intended purpose are set out in your customer contract It is your responsibility to ensure that this product is suitable for your intended purpose Ordnance Survey does not accept any liability whether for breach of contract negligence or otherwise for any loss or liability you or any third party may suffer in relying on this guide and any guidance suggestion advice or explanation provided in it Any liability that Ordnance Survey has to you in relation to the product its supply use accuracy data supplied functionality or any other liability arising out of or in connection with the product is limited as set out in your customer contract We may change the information in this guide at any time without notice We do not accept responsibility for the content of any third party websites referenced or accessed in or through this guide any contractual documentation and or the Ordnance Survey website OS MasterMap Topography Layer user guide preface v1 9 12 2010 Crown copyright Page 4 of 142 Copyright in this guide This guide including for the avoidance of doubt any mapping images reproduced herein is Crown copyright 2009 All rights reserved Any part of this guide may be copied for use internally in your organisation or business so that you can use the product for the purpose for which it is licensed to your organisation or business bu
126. gt lt osgb boundedBy gt lt gml Box srsName osgb BNG gt lt gml coordinates gt 446175 600 108523 050 446230 400 108581 100 lt gml coordinates gt lt gml Box gt lt osgb boundedBy gt lt osgb theme gt Land lt osgb theme gt lt osgb reasonForDeparture gt Deleted lt osgb reasonForDeparture gt lt osgb deletionDate gt 2006 04 01 lt osgb deletionDate gt lt osgb DepartedFeature gt lt osgb departedMember gt C EEN OS MasterMap Topography Layer technical specification annexe B v1 9 12 2010 Crown copyright Page 114 of 142 3 A new feature in the same area is added to a data holding in the COU file lt osgb topographicMember gt lt osgb TopographicArea fid osgbl000002685008338 gt lt osgb featureCode gt 10021 lt osgb featureCode gt lt osgb version gt l lt osgb version gt lt osgb versionDate gt 2006 04 01 lt osgb versionDate gt lt osgb theme gt Buildings lt osgb theme gt lt osgb calculatedAreaValue gt 35 967400 lt osgb calculatedAreaValue gt lt osgb changeHistory gt lt osgb changeDate gt 2006 03 27 lt osgb changeDate gt lt osgb reasonForChange gt New lt osgb reasonForChange gt lt osgb changeHistory gt lt osgb descriptiveGroup gt Building lt osgb descriptiveG roup gt lt osgb make gt Manmade lt osgb make gt lt osgb physicalLevel gt 50 lt osgb physicalLevel gt lt osgb polygon gt lt gml Polygon srsName osgb BNG gt lt gml outerBoundaryIs gt
127. hange can be due either to real world change or to processes not connected with real world change such as error correction or geometric cleaning and structuring of the data What constitutes a change leading to a version and what constitutes a change that is deemed to be the end of that feature s life cycle is discussed below The previous version is referred to as the superseded version and the new version as the superseding version It should be noted that in a small minority of cases a new version of a feature can be created without any change apparent to the customer This is due to change to internal attributes that the OS MasterMap database uses during the maintenance process but which are not included in product data OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 20 of 142 Feature version date The date on which the new version is created is recorded in the feature version date attribute The date is important for tracking and identifying when change has taken place Using the TOID the version number and the version date it is possible to track a feature s changes over time It is worth noting that the date the version changed for Ordnance Survey will probably be different from the date on which the feature is loaded into the customer s file or database holding Many translators will provide an additional column within the holding to record the load date It is important for the customer to id
128. hare data with other organisations Data association can be a complex undertaking as the extent to which an organisation can implement it depends on many factors including the systems they have in place the number of different sets of data within the organisation and the manner in which they have created that data in the first place This chapter concentrates on the key concepts of data association and serves as an introduction to the subject from the OS MasterMap Topography Layer point of view For a fuller discussion of data association please see the OS MasterMap Implementation guide 1 and the DNF website referred to above Firstly a relatively simple example of how data association might work In figure 26 below there is a car park owned and operated by the local authority Within the local authority there are a number of different datasets that contain information about that car park The finance department holds information on the number of spaces it has the opening times and the parking rates The maintenance department has details on when it was last resurfaced how much it cost and who undertook it The tourism department has it on a list of car parks that it makes available to visitors Each department has a different way of referencing the car park and none of them hold the same piece of information as any other department It is not easy to match the data to the real world object as no single piece of information clearly and uniguely id
129. he COU version is lower then the COU version should be ignored Archiving the OS MasterMap data holding As OS MasterMap features progress through their life cycles it is possible to develop snapshots of the features by holding superseded versions in a local data archive By holding and maintaining a local data archive customers will be able to interrogate previous views of the world straight from their local data holding It will be important to consider carefully how to archive OS MasterMap features and what reguirements the applications and users will have to access the older information Archiving may be done by simply writing older versions of the data to hard media or a more sophisticated system of keeping historical data live on the system may be adopted It is important for customers to recognise their unique requirements be they user statutory or regulatory requirements as archiving can become a significant overhead in terms of storage Before designing or implementing an archive of OS MasterMap Topography Layer it is advisable for a customer to discuss reguirements with their system supplier OS MasterMap Topography Layer user guide chapter 7 v1 9 12 2010 Crown copyright Page 53 of 142 Associating data to OS MasterMap features As stated in the first two chapters one of the key reasons behind providing this level of reference attribution is to provide a mechanism for customers to link their data to Ordnance Survey data and s
130. he component parts output separately in a multiline geometry Intersecting polygon boundaries Some polygons have inner boundaries that have a common point with each other or with the outer boundary In this case each loop formed where the boundary returns to the common point is treated as a separate boundary Example This polygon has an outer boundary ABCDEA and two inner boundaries AHGFA and GKJIG OS MasterMap Topography Layer technical specification chapter 7 v1 9 12 2010 Crown copyright Page 92 of 142 Chapter8 Change only update COU What is COU COU is data that is provided to bring a user s data holdings up to date with the most recent data available from Ordnance Survey COU contains for a user s defined area only the features that are new or have changed as well as departed features those that have moved or been deleted from the user s data extent Any feature that is new or changed since the COU date the user provides will be supplied in its latest version and departed features will indicate which features have been moved or deleted since that date COU will not provide intermediate versions of features that have existed between the previous order and the most recent version Conversely COU may supply departed information for features that that the user has never had as they have appeared and subseguently disappeared between order dates COU data format COU data is supplied in GML 2 1 2 format as detailed i
131. he contract area in which case the line will not be supplied at all When a polygon changes so that it no longer falls in the same chunk for instance when a Topography Layer feature used to lie partly inside a chunk and instead is now reduced in size so it is wholly within an adjacent chunk it is reported as a departed feature in one chunk and as a modified feature new version in the adjacent chunk This is shown in figure 23 below For more on departed features see the section below Feature version 1 Chunk files modified feature version 2 Deleted feature Figure 23 feature types and chunk boundaries It is possible for OS MasterMap features with point geometry to be included in multiple adjacent chunk files This is because the guery used to populate a chunk file includes all features that touch its boundary and this boundary is shared with adjacent chunks Therefore OS MasterMap loading software must be able to identify and remove point features across multiple files in the same way as for features represented by lines and polygon geometries Non geographic chunking option This supply format delivers OS MasterMap vector over data for the Topography Layer polygon format ITN Layer and Address Layer 1 and 2 non geographic chunks are not available for the Imagery Layer in files that have a fixed nominal file size as opposed to a given geographic area The customer selects the compressed file size from options of 10 Mb 30 Mb or
132. he section on life cycles when a feature reaches the end of its life it is removed from the Ordnance Survey main holding When a feature is removed its status is reported to the customer that is taking COU as a departed feature When a customer orders a COU a list of departed features is provided so that the loading software can add and subtract the features to the customer s holding accordingly Departed features are supplied in COU data with respect to a given date Features that have left the area or themes of the data supply since midnight on this date are included as departed features This information is supplied to inform user systems that all versions of this feature are no longer current Some departed features are present in COU for features that have not been previously supplied this is for a number of reasons including the creation and removal of features in the specified time period and the limited information stored in the OS MasterMap main holding about previous versions of features Departed feature information is not given when a particular version of a feature is replaced by a new version with an incremented version number The existence of the new version in the data supply set indicates that any feature with the same TOID but a lower version number is no longer a current feature OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 50 of 142 The list provides the TOID of the departed features
133. he topographic features in their locality This relationship is known as a boundary mereing This relationship is recorded within OS MasterMap as a textual description A list of the most common abbreviations is given below Object or mereing Baulk bank base of basin bridge broad Cam canal causeway centre of channel cliff conduit cop course of covered culvert cut Dam ditch dock double down drain Double ditch or drain Double fence Defaced Edge of eyot Face of fence fleet freeboard Feet Harbour hedge Inches Kerb Lade lake lead loch lockspit lynchet Marsh mere moat The following are examples of combined abbreviations Object or mereing Centre of bank basin baulk broad and so on Centre of railway river road and so on Centre of old course of stream 1 22 metres root of hedge Abbreviation Object or mereing B C DD Def T PP m m M Mean high water Mean high water springs Scotland only Mean low water Mean low water springs Scotland only Metres Old Passage path pond post Race railway ride river road root of Root of hedge Scar sewer side of slope sluice stone stream Top of Track Undefined Wall weir Abbreviation CB CR COCS 1 22 m RH NOTE special rules apply to boundary mereings and only the more common ones are listed Abbreviation MHW MHWS MLW MLWS JU UOS Tk Und Where the merein
134. hemes features and attributes Layers OS MasterMap is currently supplied in six layers Each layer can be used independently of the others although they are designed to integrate and complement each other Topography Layer The Topography Layer was the first layer to be produced in November 2001 The features within this layer are mainly features that appear in the landscape such as buildings land water and roads figure 4 It also includes administrative boundaries These are not physically present in the landscape but are often important in relation to the physical features that are present in the real world It is the most detailed layer containing over 425 million features as of June 2009 ne SS Sy TS GE oum Figure 4 OS MasterMap Topography Layer OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 10 of 142 Address Layers OS MasterMap Address Layers contain approximately 28 million geographic features in Great Britain which is England Scotland and Wales but not the Isle of Man the Channel Islands or Northern Island Addresses are available in three sets The first Address Layer contains postal addresses with a unigue identifier references to the underlying OS MasterMap Topography Layer feature and information on how and when the address may have changed In Address Layer 2 each feature is provided with a unigue identifier a series of cross reference identi
135. his way the road theme would contain many very large polygons that would not be particularly useful in terms of being able to derive data from them or for customers to attach meaningful attribution to them Roads with comparatively few junctions such as motorways are also split where another feature crosses them such as a road bridge or footbridge The other type of inferred links is polygon closing links These are used to make more manageable or logical polygons One example would be the creation of a link to separate an open plan garden around a pair of semi detached houses into two distinct entities reflecting that there are two properties there in the real world It must be stressed that these polygon closing links do not constitute the legal boundary of any property any more than a physical line feature does These links are clearly identified in the descriptive group attribution and if a customer wishes to not show these features it would be possible with most GIS to not display them by filtering out any line features with this value The descriptive group attribute is discussed in further detail in the next chapter Figure 14 shows both types of inferred link the links highlighted in black are network closing links and the lines highlighted in red are polygon closing links Figure 14 inferred links Creation of line features When a new linear real world object comes into being a new line feature is created to represent it D
136. hworks are of low relief and do not meet Ordnance Survey criterion To depict the feature clearly it may be necessary to exaggerate antiguity detail In mountain and moorland areas some antiguity features may be generalised without losing the essential characteristics of the depiction Land The land theme is defined as those man made and natural features that delimit and describe the surface cover other than routes of communication and buildings This includes both natural and man made slopes and cliffs All general features are also placed in the land theme Landform features such as slopes and cliffs behave slightly differently from other features in that where they are represented as line features they can cross other line features without being broken at intersections and when they are polygon features can overlap other polygon features instead of sitting adjacent to them The land theme encompasses those areas that do not form part of another theme for example a grass verge next to a road would appear in the roads tracks and paths theme whereas a grass area within a park would be in the land theme The limits of geographic features such as hills and valleys are not recorded although the distinctive names of these geographic features are shown Physical features shown in the land theme include e parks playing fields football pitches golf courses and so on e_ slopes and cliffs e_ car parks e gardens e woodlands
137. ication Spatial extent The spatial extent is supplied in the form of geographic identifiers for example England Scotland and Wales and in the form of geographic coordinates Spatial reference system The spatial reference system for all products takes the form of a British National Grid system namely OSGB36 Data format Data format takes the form of the name of the format or formats the product is supplied in Frequency of updates Frequency of update takes the form of a stated period of time Distributor contact details Distributor contact details include with postal address phone number fax number email address and website Data originator Given as the company having primary responsibility for the intellectual content of the data source in all cases this will be Ordnance Survey Other metadata available includes keywords start date of data capture access constraints use constraints level of spatial data supply media and presentation details OS MasterMap Topography Layer user guide annexe C v1 9 12 2010 Crown copyright Page 61 of 142 Annexe D Product and service performance report form Ordnance Survey welcomes feedback from its customers about OS MasterMap Topography Layer If you would like to share your thoughts with us please print a copy of this form and when completed post or fax it to the address below YOU name na o NI GU MU y YN Y AU FF m e EE Le TEE el Quotation or order reference see
138. in size using the calculated area provided as one of the attributes OS MasterMap Topography Layer user guide chapter 2 v1 9 12 2010 Crown copyright Page 16 of 142 It is important for many applications of GI to be able to identify where change has taken place Customers may need to learn how the landscape has altered and to reflect those changes in the customer s own data Ordnance Survey updates OS MasterMap Topography Layer on a regular basis and these changes are passed on to the customers through a service called change only update COU This supplies just those features that have changed since a customer either first ordered OS MasterMap Topography Layer or last took an update This should normally result in much less data needing to be processed every time a customer updates their holding although that is dependent on how freguently it is taken Furthermore OS MasterMap Topography Layer is the first product from Ordnance Survey to introduce the concept of feature life cycles and unigue referencing This makes it possible to relate change in the real world to features in the digital environment and to identify and manage that change so that customers can if they wish keep their own data up to date and the consequences of change can be assessed It may even be possible depending on the systems used for customers to roll back their holdings of OS MasterMap Topography Layer to a specific point in time Ordnance Survey it should be noted d
139. ine features representing inferences about the real world rather than topographic statements of fact These sensibly subdivide certain types of polygon feature where there is no appropriate topographic detail They are normally used to e_ divide road sections e separate individual garden plots in residential areas where no dividing fence hedge or wall exists e close junctions between roads and car parks or hard standing areas and e_ close fields that have simple breaks in the hedge or wall rather than gates layer A layer is a group of related OS MasterMap themes A layer may consist of one or more themes For example the Topography Layer is composed of nine themes whereas the Address Layer contains three themes OS MasterMap Topography Layer technical specification annexe A v1 9 12 2010 Crown copyright Page 109 of 142 Licensed Partner Any organisation that has entered into a formal licence agreement with Ordnance Survey to market map information or to incorporate map data with their application or service life cycle The series of events that occur in the life of a real world object or the OS MasterMap feature s that represents it This will always include those events that result in creation and deletion and may also include events that result in amendments or change line The straight line segment between two given points line feature The OS MasterMap abstraction of a linear object such as a wall or riverbank The geom
140. ing the OS MasterMap data holding 119999YYYnYY FC YYH A LLE LLALL A LLYR REY LL Y en 53 Associating data to OS MasterMap features inne Y HL LLYR LR HYLL LL LLY Ln nn nu 54 uum TE 56 R I 58 Administrative boundary alignments ccccceseeeceseeeeeceseeeeeeeseseeeseeseeeeeseseseeeenseseeeeneeeenens 59 Case Studies sisi E 60 Laus UR e ue FEN A GRE LY EGNI YN DAR chivadscechvesendehsageqacervads LO HERR LB E Lh au AX ETUR RARE UR RR 60 Forestry Commis EE 60 London Fire Brigad E 60 Metadata ine mt 61 Product and service performance report form EEN 62 v1 9 12 2010 D05300_27 OS MasterMap Topography Layer user guide contents v1 9 12 2010 Crown copyright Page 3 of 142 Preface This user guide hereafter referred to as the guide is designed to provide an overview of OS MasterMap Topography Layer hereafter referred to as the product and it gives guidelines and advice on how a customer might derive the maximum benefit from the product It assumes a general knowledge of geographic information If you find an error or omission in this guide or otherwise wish to make a comment or suggestion as to how we can improve the guide please contact us at the address shown below under contact details or complete the product and service performance report form at annexe D and return it to us Contact details Our Customer Service Centre will be pleased to deal with your enguiries Customer Service Centre Ordnance Survey Adananc
141. irectly so customers do not have to unzip the files prior to processing Seamless OS MasterMap features in the vector layer are a seamless representation of Great Britain Prior to the introduction of OS MasterMap both paper and to a certain extent digital maps derived at large scale tended to be divided into tiles This resulted in the artificial splitting of features across one or more tiles OS MasterMap is delivered without dividing features up as a seamless entity As there is no map tile or similar data unit the basic units of OS MasterMap data are features Therefore customers are advised to manage OS MasterMap data at the feature level using the TOID to reference and store information on features Initial and COU supply Initial supply refers to the first order of OS MasterMap that a customer takes An initial supply contains all features for all layers selected for the complete area covered by the order Updates which contain the latest changes to the features are not automatically sent out at regular intervals A customer decides when to place an order for updates A COU only contains new features new versions of features and information about departed features Any feature within the area covered by the order that has not undergone any of the change will not be supplied OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 46 of 142 The advantages of supplying COU rather than a complet
142. is supplied The fact that it is empty will be shown by the letter e in the filename The 3 is a counter to provide a unique file name in the case of multiple chunk files within one chunking grid sguare This can have a value between 1 and 9999 Figure 25 below shows what happens in the instance of a selection polygon that falls within a chunk sguare twice polygon Figure 25 explaining counters in file names Two files are supplied each one distinguished by a counter number 1 and 2 Other file names A non geographic chunk will have the following file name format nnnnnn nnnnnn nn gz for example 123456 000012 10 gz where the final two numbers indicate the nominated file size in megabytes Compressed FVDS files are named as follows nnnnnn LLnnnnnn nn gz For example 1232456 FV000012 30 gz where the two letters FV indicates that it is a FVDS file A GML summary file has a name in the form nnnnnn summary gml This chapter has described how OS MasterMap Topography Layer is supplied including descriptions of the online ordering system and data format the system of chunking reguired to handle seamless data the way change is supplied including the issue of departed features and how to understand the file names It has also offered guidance on how to update a customer s data holdings The next chapter expands on the issues surrounding change management that derives from applying updates and expands on the principles of data
143. ital National Framework DNF A nationally consistent geographic referencing framework for Great Britain comprising the National Grid and the National Geographic Database that defines each geographic feature as it exists in the real world with a maintained unigue reference allocated to each feature The DNF is not a product it is the framework on which our future products will be based distinctive text Distinctive text is defined within the Topography Layer as a name given to a feature or place to distinguish it from other features or places of a similar nature for example River Avon Hill Lane Surgery Leeds or New Forest feature An abstraction of a real world object It is not the real world object itself The OS MasterMap product is composed of discrete vector features each of which has a feature type geometry and various feature attributes feature code A numerical feature code a five digit integer assigned to each feature with the Topography Layer This feature code is wholly determined by the feature type the descriptive group s and the descriptive term s feature type A high level grouping of features that are treated in a similar way for example TopographicPoint features fid Feature identifier usually as used in the context of GML FTP File transfer protocol A protocol that allows a user on one computer to transfer files to and from another computer over a TCP IP network such as the Internet OS MasterMap Top
144. ithin the landscape OS MasterMap Topography Layer user guide chapter 8 v1 9 12 2010 Crown copyright Page 56 of 142 Figure 28 styling options with OS MasterMap Topography Layer The customer s own data is what catches the eye first and is the focus of attention Some systems will allow different views of the data so that one type of styling can be seen by one set of viewers and a different style entirely by others to suit their individual reguirements OS MasterMap Topography Layer may also be styled just by the line or point features to replicate the engineering style of drawing commonly used in computer aided design CAD systems Further information on using OS MasterMap Topography Layer in CAD systems is available from the Ordnance Survey website The data can even be rendered in black and white to save on printer ink if the printed map is going through various drafts before a final full colour version in produced or for use in presentations and documents that are only going to be printed in black and white This chapter has discussed how by adapting the flexibility of OS MasterMap Topography Layer in terms of how it can be displayed a customer can visualise the attributes in thematic maps and derive information from the map in a visual way customise the maps to best reflect the different applications to which it is put and produce clear high guality maps for use in document presentation or just as hard copy for wh
145. l xsi http www w3 org 2001 XMLSchema instance xlink http www w3 org 1999 xlink The location of the schema is defined as http www ordnancesurvey co uk xml namespaces osgb http www ordnancesurvey co uk xml schema vX OSDNFFeatures xsd The fid is set to the Ordnance Survey identifier given to the query For example lt osgb FeatureCollection xmlns osgb http www ordnancesurvey co uk xml namespaces osgb xmlns gml http www opengis net gml xmlns xlink http www w3 org 1999 xlink xmlns xsi http www w3 org 2001 XMLSchema instance xsi schemaLocation http www ordnancesurvey co uk xml namespaces osgb http www ordnancesurvey co uk xml schema vX OSDNFFeatures xsd fid gueryId gt lt osgb FeatureCollection gt Guery result properties The gml description element is the first property of the feature collection this contains a copyright statement and the date of the guery The gml boundedBy element is the next property of the feature collection this contains a gml null element with the value of unknown The start time of the guery is specified at GMT as a feature property The name of the property is gueryTime The following optional properties are provided for the osgb FeatureCollection if they were provided as part of the guery The ordering of these properties is according to the order they appear in the table Name Type Format Description gueryExtent Geometric gml Polygon or osgb Rectangle The query exte
146. l feature General topographic features Land Residential land car and minor detail parks agricultural land slopes cliffs and quarries General surface Features representing Land Residential land car describing or limiting areas of parks agricultural land land not covered by buildings or slopes cliffs and quarries structures Glasshouse Features representing Buildings Glasshouse glasshouses Height control Features with height Terrain and Bench marks information height Historic interest Features of heritage value Heritage and Text indicating the site of a antiquities historic event or an actual physical historical structure such as Hadrian s Wall Inland water Features representing Water Streams lakes rivers and describing or limiting areas of canals water that are not tidal Landform Features representing Land Residential land car describing or limiting areas of parks agricultural land landform for example slopes slopes cliffs and quarries or cliffs Natural environment Features representing Land Residential land car geographic areas and extents of natural environments and terrain parks agricultural land slopes cliffs and quarries Network or polygon closing geometry Features used to close polygons Land and road tracks and paths Road junctions and gardens Path Features representing and limiting the extent of pathways Roads tracks and paths Road sections roundab
147. l successor to the original If the continuation of the feature cannot be justified on one or more of these grounds the feature is deleted and replaced with a new feature Examples e A private house is extended The building and garden features are retained e A field changes shape and reduces in size due to the realignment of one of its boundary fences alongside a road The field feature and the adjacent road features are retained Splitting of polygon features When a real world polygon object is split into two or more separate real world objects one of the features may be clearly recognisable as the original real world object If this is the case then the feature is retained If it is not clear whether one of the resultant features represents the same real world object as the original feature then the following considerations are used as a guideline e ls the function of one of the resultant real world objects the same as the original e ls one of the resultant real world objects the obvious logical successor to the original e Does one of the resultant real world objects occupy more than half the area of the original If the continuation of the feature cannot be justified on one or more of these grounds the original feature is deleted and replaced with new features Examples e Anew housing development is completed within an agricultural field Part of the field remains and continues to be used for agriculture The feature represen
148. ld object for example a building or land parcel obscured level Where more than one level of detail exists all detail that meets the specification for capture positioned below cartographic surface level and either at or above ground surface level is captured as obscured detail For example detail under bridges is obscured whilst the bridge itself is at normal cartographic level offline supply The supply of data to a customer on physical media for example CD or DVD online supply The supply of data to a customer using Internet technologies order A reguest from a customer for the supply of data The scope of an order may be constrained by an agreement for a period licence service OS MasterMap Topography Layer technical specification annexe A v1 9 12 2010 Crown copyright Page 110 of 142 Ordnance Datum Newlyn The mean sea level at Newlyn in Cornwall calculated between 1915 and 1921 and taken as a reference point for the height data on Ordnance Survey maps orthorectified imagery The Imagery Layer is orthorectified An ortho image is achieved through a rigorous mathematical modelling of the camera position direction and the terrain surface at the moment of image exposure A software process is then able to move each of the pixels in the image individually into its correct National Grid position The process eliminates displacements due to image perspective and pointing direction the aircraft is moving and rolls around all ax
149. line points 0 0 0 725 0 0 0 775 gt lt polyline points 0 651 0 485 0 584 0 463 0 517 0 437 454 0 407 0 392 0 373 0 333 0 335 0 276 0 293 0 222 248 0 171 0 199 0 123 0 147 0 078 0 092 0 037 0 035 0 0 025 0 037 0 035 0 078 0 097 0 123 0 147 0 171 0 199 222 0 248 0 276 0 293 0 333 0 335 0 392 0 373 0 454 0 407 517 0 437 0 584 0 463 0 651 0 485 polyline points 0 445 0 148 0 384 0 182 0 316 0 22 27 0 261 0 217 0 306 0 167 0 354 0 120 0 405 0 077 0 459 036 0 516 0 0 0 575 0 036 0 516 0 077 0 459 0 120 0 405 167 0 354 0 217 0 306 0 27 0 261 0 316 0 22 0 384 0 182 445 0 148 OOOOA AOOooO0o0o0 HH OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 127 of 142 smallNonconiferousTreeFillSymbol Style stroke H669966 fill none stroke width 0 087 C3 Arc geometry path d M0 0 8L 0 1 0 4a0 3 0 3 0 1 0 0 4 0 43a0 275 0 275 0 0 0 0 225 0 445a0 28 0 28 00 0 0 55 0 0a0 275 0 275 O 0 O 0 225 0 445a0 3 0 3 0 10 0 4 0 43L0 0 8z gt Linear geometry polyline points 0 537 0 087 0 552 0 076 0 566 0 064 0 580 0 052 0 592 0 038 0 604 0 024 0 615 0 008 0 625 0 007 0 634 0 024 0 642 0 041 0 649 0 058 0 655 0 076 0 660 094 0 663 0 112 0 665 0 131 0 667 0 149 0 667 0 168 666 0 187 0 663 0 205 0 660 0 224 0 65
150. m polygon Polygon Specifies a polygon bounding an area feature See polygon data type above and see chapter 7 Geometry and topology for details polyline Polyline Multiline This is either a Polyline or a Multiline geometry In TopographicLine features this will only be a Multiline if there is a problem with the geometry that is indicated by the broken metadata flag See Metadata section See chapter 7 Geometry and topology for details reasonForChange String The reason for a change made to a feature Forms part of the feature s complex attribute changeHistory See Attribute values reasonForChange reasonForDeparture String This is set to Deleted or Vacated to indicate whether a feature has physically been deleted from the database or is no longer relevant due to change in COU supply See COU chapter referenceToFeature TOID A reference by TOID to a related feature In topographic features this is used to point from a heighted feature to an unheighted feature In cartographic symbol features it is used to point from the symbol feature to the topographic feature to which it refers textString theme String String Textual information that can be rendered using the textRendering attribute A theme that the feature belongs to See Theme definitions TOID TOID The unigue 16 digit reference number of a feature In the GML this is prefixed with osgb to
151. mbol NE Symbol 2 scrubFillSymbol ini Name scatteredNonconiferousTreesAndScatteredConiferousTreesFillSymbol Symbol 1 smallNonconiferousTreeFillSymbol Symbol 2 smallConiferousTreeFillSymbol f Name scrubAndScatteredNonconiferousTreesFillSymbol Symbol 1 scrubFillSymbol Symbol 2 smallNonconiferousTreeFillSymbol OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 132 of 142 Transformation 4 Symbol 1 translate 2 2 Symbol 2 translate 0 5 0 5 Symbol 3 translate 2 2 Name rocksRoughGrassAndBouldersFillSymbol Symbol 1 rocksFillSymbol Ts Ly Symbol 2 roughGrassFillSymbol un 7 C gt Symbol 3 bouldersFillSymbol me Name roughGrassNonconiferous TreesAndConiferousTreesFillSymbol Symbol 1 roughGrassFillSymbol 7M Symbol 2 nonconiferousTreesFillSymbol C y 4 Symbol 3 coniferousTreesFillSymbol Name roughGrassNonconiferous TreesAndScrubFillSymbol Symbol 1 roughGrassFillSymbol Symbol 2 nonconiferousTreesFillSymbol Symbol 3 scrubFillSymbol Name scrubNonconiferous TreesAndCoppiceFillSymbol Symbol 1 scrubFillSymbol Symbol 2 nonconiferousTreesFillSymbol Symbol 3 coppiceFillSymbol Name scrubConiferous TreesAndNonconiferousTreesFillSymbol Symbol 1 scrubFillSymbol Symbol 2 coniferousTreesFillSymbol Symbol 3 nonconiferousTreesFillSymbol Transformation 5 Symbol 1 translate 0 1 Symbol 2 translate 2 1 Symbol 3 tr
152. mple For example the heathAndScrubPattern uses the natural environment grid to produce the pattern below This is then applied as a polygon fill OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 136 of 142 Line styles Name defaultLine stroke width 0 07 Default Default dashed Name defaultDashedLine stroke width 0 1 stroke dasharray 0 5 0 5 Building 000000 Name buildingLine stroke width 0 07 Building overhead Name buildingOverheadLine stroke width 0 1 stroke dasharray 0 5 0 5 Water bold 00CCFF Name waterBoldLine stroke width 0 4 Water dashed 00CCFF Name waterDashedLine stroke width 0 1 OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 137 of 142 Water 0099FF Name waterLine stroke width 0 07 Underground 333333 Name defaultUndergroundLine stroke width 0 2 stroke dasharray 3 0 1 0 Structure overhead CC9966 as a SSS Name structureOverheadLine stroke width 0 2 stroke dasharray 2 0 1 0 Landform bold A Wa EN E E Wm Wm Name landformBoldLine stroke width 0 3 stroke dasharray 0 8 0 8 Landform Name landformLine stroke width 0 1 stroke dasharray 0 8 0 8 Narrow gauge railway alignment 333333 Name narrowGaugeRailwayAlignmen
153. mple class model from BNG points from BNG 727 easting f oat64 2 n northing float64 nofPoints int Multiline A multiline is a collection of polyline geometries There are no specific semantics or rules applied to the collection Example Example class model Multiline from BNG polyline nofPolylines int 1 Rectangle A rectangle is a pair of points that are used to define a rectangular area that is aligned to the National Grid One point defines the minimum easting and northing of the rectangle the other defines the maximum easting and northing RN OS MasterMap Topography Layer technical specification chapter 7 v1 9 12 2010 Crown copyright Page 89 of 142 Example Example class model Point Rectangle from BNG from BNG gt easting float64 2 northing float64 Geometric ring A geometric ring is an ordered set of four or more points that are interpolated linearly where the first point is the same as the last point A ring is not permitted to intersect itself or contain other repeated points Example BNG 176579 205 987663 345 DN BNG 176554 565 987654 545 BNG 176575 685 987654 545 Example class model Ring Point points from BNG EES easting f oat64 nofPoints int northing float64 Polygon A polygon is a single closed region on the spatial reference system proj
154. n horizontal geometry only Several orthometric height datums are used in OS MasterMap data to define vertical spatial reference systems The most common of these is Ordnance Datum Newlyn ODN which is used throughout mainland Britain Height attributes in OS MasterMap features do not specify which vertical reference system is used Introductory material on the BNG and ODN and the full definition of the BNG OSGB36 National Grid is available on the Ordnance Survey OS Net GPS site e http www ordnancesurvey co uk oswebsite gps Geometric data types Point A point is used to specify a single horizontal location by a coordinate pair in a given spatial reference system Example A point defined in the BNG reference system has easting and northing ordinates in units of metres where the easting is in the range 0 to 700000 and the northing is in the range 0 to 1300000 Ordinates are output to mm precision and are output in the data as float64 real types OS MasterMap Topography Layer technical specification chapter 7 v1 9 12 2010 Crown copyright Page 88 of 142 X BNG 176554 565 987654 545 Example class model Point from BNG easting float64 northing float64 EM Polyline A polyline is an ordered set of points that are interpolated linearly A polyline may not intersect itself or contain repeated points Example BNG 176579 205 987663 345 BNG 176554 565 987654 545 BNG 176575 685 987654 545 Exa
155. n COU section of chapter 9 Inclusion of features in the COU file is triggered by a new version of a feature appearing in the database with a version date between the previous and new order dates In the data these new and modified features are represented in the same way they would for a full supply Departed features are a specific feature type only present in COU supply and that represent features to be removed from a user s holding The departed features records contain the TOID of the deleted feature its bounding rectangle its theme or themes and the date and reason for its departure For further detail of these attributes and their content please see chapter 5 Attribute definitions Applying COU All the information to update a user s holding is provided in the COU file How this is processed by the user s software is obviously critical to ensuring that these changes are correctly applied The basic principles that need to be followed to help ensure consistency are e Ensure initial supply or latest full supply or COU has been correctly loaded This can be checked with the feature validation dataset FVDS which gives a full list of the TOIDs that should be in a user s current holding at time of full supply e Ensure that the COU to be applied covers the period from the date of last supply Extraction date through to the update date reguired e Apply the COU to existing holding How this is applied will be dependent upon the user s
156. n be applied to features are e emphasis e selection for inclusion e simplification and e omission Real world objects may also be aggregated in OS MasterMap for example a small group of trees may be recorded as a single feature Administrative boundaries These are defined as showing the limits of responsibility and representation for electoral and administrative purposes Boundary alignments are shown within the administrative boundaries theme As well as the boundary s relationship to real world objects its mereing and boundary descriptions where needed for clarification are also supplied The following types of boundary are shown within the administrative boundary theme Parliamentary boundaries e European electoral region e county constituency e borough constituency England and Wales e burgh constituency Scotland e assembly electoral region and assembly constituency Wales and e parliamentary electoral region and parliamentary constituency Scotland OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 27 of 142 Local government boundaries In England e county e_ City and County of London district London borough unitary authority and metropolitan district e_ civil parish and the Inner and Middle Temples e electoral division and e ward In Wales e unitary authority e community and e electoral division In Scotland e unitary authority
157. n the chunk order but still exists in OS MasterMap and therefore could reappear in the chunk holding in the future A deleted feature also has a date of deletion but a date is not applied to a vacated feature Deleted is the default value that can be assumed unless vacated is stated If a feature has left one geographic chunk but continues to exist in an adjacent chunk it will continue to be reported as a departed feature in the former chunk The reason for departure is vacated and the latter chunk will contain a later version of the feature If the feature has vacated a chunk and subseguently been deleted the reason for departure is deleted In other words each chunk file reports COU with respect to the boundary of that chunk and without knowledge of the other chunks in the customer s order This is reguired because the concept of geographic chunks is that they can be used alone or in customer defined blocks if reguired The same TOID can appear as both a departed feature in one chunk file and as a modified feature in an adjacent chunk In non geographic chunks there is logically only one set of departed features in the data order There is no concept of a feature having departed from a chunk since the chunk does not have a geographic boundary However vacated features will still exist in data supplied in non geographic chunks due to features moving outside the data holding boundary or unusually changing theme to a theme that th
158. nformation on ordering COU is available from Ordnance Survey s website Managed Great Britain GB Sets For those customers with full Great Britain coverage contracts of OS MasterMap there is a Managed GB Sets service The Managed GB Set is available for all vector layers of OS MasterMap The Managed GB Sets service is a means of processing identical orders faster thus improving delivery times with benefits for Great Britain customers and partners Subscribers to this service will automatically receive their updates full supply or COUs on CD or DVD either quarterly or every six weeks With this option customers and Ordnance Survey Licensed Partners that take Great Britain coverage can benefit from e data arriving faster and in a more predictable and timely manner e seeing the same version of features as other organisations and e easier data management as the data is automatically generated and sent out It is comparable to setting up a scheduled update except that Ordnance Survey determines when the data is made available Further information on the Managed GB Sets service including the release dates are available on the Ordnance Survey website Supply options There are a number of options available to customers when ordering data that provide additional metadata or aid data management OS MasterMap Topography Layer user guide chapter 6 v1 9 12 2010 Crown copyright Page 47 of 142 Chunk files To make the managemen
159. ng its life so the feature within OS MasterMap will also change in terms of its shape or its attribution Whilst it remains the same feature essentially occupying the same space and having the same function the TOID will not change but the version number will increment and the version date will change This allows an instance of a feature to be identified in both space and time Little bbaurne Mullions Haus SS eme TESIR EEN d Indian Oueens Allotment Gardens Figure 9 extract of OS MasterMap Topography Layer OS MasterMap Topography Layer user guide chapter 2 v1 9 12 2010 Crown copyright Page 15 of 142 The product is divided into nine themes that group at a high level the features into logical groups of objects that indicate the scope and contents of the data contained within the product They are e Administrative boundaries e Buildings e Heritage and antiquities e Land e Rail e Roads tracks and paths e Structures e Terrain and height e Water OS MasterMap Topography Layer introduces many new concepts designed to take advantage of the latest technologies in spatial data management and modelling the real world in computer systems The combination of structure and attribution means that OS MasterMap Topography Layer is adapted to being stored in tabular or database form and can be more readily manipulated and searched by spatial querying tools such as a GIS or a spatial database It i
160. ngle gt lt osgb queryExtent gt lt osgb queryChangeSinceDate gt 2001 01 31 lt osgb queryChangeSinceDate gt lt features go here gt lt osgb boundedBy gt lt gml Box srsName osgb BNG gt lt gml coordinates gt 3999350 3089542 4005602 3095673 lt gml coordinates gt lt gml Box gt lt osgb boundedBy gt lt osgb FeatureCollection gt Features Each feature within the osgb FeatureCollection is encapsulated in one of the following member elements according to its feature type Member element Feature type boundaryMember BoundaryLine cartographicMember CartographicText CartographicSymbol topographicMember TopographicPoint TopographicLine TopographicArea departedMember DepartedFeature see COU section later in this chapter Each member element contains a single feature element that has the name of the feature type for example TopographicPoint TopographicLine and so on The TOID of the feature is provided in the XML attribute fid of the osgb Feature element A TOID has a maximum of 16 digits and is prefixed with osgb The osgb prefix is reguired to form a valid XML ID type A feature element does not contain a name description or boundedBy element For example lt osgb topographicMember gt lt osgb TopographicPoint fid osgb15789329786 lt osgb TopographicPoint gt lt osgb topographicMember gt Properties Our application schema defines three main types of properties
161. nical specification chapter 2 v1 9 12 2010 Crown copyright Page 68 of 142 Chapter3 Theme definitions This chapter describe the themes that are included in Topography Layer data and gives example of real world objects that are represented within these Definitions Administrative boundaries Description The limits of responsibility and representation defined for electoral and administrative purposes Theme rule descriptiveGroup Political Or Administrative Examples European county district ward and civil parish boundaries Boundary stones boundary mereing symbols and relevant cartographic text Buildings Description Roofed constructions usually walled This will typically include permanent roofed constructions that exceed 8 0 m in area 12 0 m in private gardens Exceptions are made for smaller buildings in such a detached position that they form relatively important topographic features Storage tanks may be classified as buildings Theme rule descriptiveGroup Building Glasshouse or Buildings Or Structure Examples Covered and roofed structures and relevant cartographic text Heritage and antiquities Description Features and cartography that depict sites or constructions of historic interest This theme is currently very limited in content Theme rule descriptiveGroup Historic Interest Examples Text Site of Hadrian s Wall and explicit sites of features
162. nsistent definition of how real world change is handled by Ordnance Survey However not all changes to the real world object will be reflected in changes to the feature For example the addition of a new porch to a house would usually be considered too minor a change for Ordnance Survey data capture Different customers with different applications think of feature life cycles in different ways For some any change to the geometry or classification of a feature means that the feature is no longer the same feature for their application For others the requirement is for persistence of features so a feature continues to exist through extensive modification Customers may wish to consider and create their own definitions of change for comparison with Ordnance Survey definitions Understanding change is important to understanding the OS MasterMap product and to deriving the optimum value from it Life cycle rules adopt the approach of allowing features to persist through changes so far as is reasonable There is inevitably some degree of subjectivity involved in judging that a real world object has changed so much it can no longer be considered the same object and therefore the OS MasterMap feature s representing it should be deleted and replaced The specific rules are detailed later in this chapter First though it is important to understand how the attribution records a feature s life cycle Unique feature references TOIDs Firstly ever
163. nt provided as property see geometric properties in part of a spatial guery Geometry gueryChangeSinceDate Date CCYY MM DD The date that was given as part of a change only guery For geographically chunked data if there are features in the collection the last element in the feature collection is an osgb boundedBy element This is a gml Box defining the minimum bounding rectangle of all items in the collection including the guery extent If the collection is empty no osgb boundedBy element is provided For example lt osgb FeatureCollection xmlns osgb http www ordnancesurvey co uk xml namespaces osgb xmlns gml http www opengis net gml xmlns xsi http www w3 org 2001 XMLSchema instance xmlns xlink http www w3 0rg 1999 xlink xsi schemaLocation http www ordnancesurvey co uk xml namespaces osgb http www ordnancesurvey co uk xml schema v3 OSDNFFeatures xsd fid gueryId gt lt gml description gt OrdnanceSurvey C CrownCopyright All rights reserved 2002 05 16 OS MasterMap Topography Layer technical specification chapter 9 v1 9 12 2010 Crown copyright Page 95 of 142 lt gml description gt lt gml boundedBy gt lt gml null gt unknown lt gml null gt lt gml boundedBy gt lt osgb gueryTime gt 2001 03 28T14 31 54 lt osgb gueryTime gt lt osgb gueryExtent gt lt osgb Rectangle srsName osgb BNG gt lt gml coordinates gt 4000000 3094763 4000010 3094820 lt gml coordinates gt lt osgb Recta
164. oes not supply previous versions of any feature One of the most common uses for Gl is to produce maps that are coloured to highlight a particular value or property that a real world feature may have These are often called thematic maps An example is given below in figure 10 The figure was created by grouping the calculated area value attribute of each unit on an industrial park into one of five categories Each category is themed with its own colour The ranges and colours are shown in the legend Most computer systems offer the ability for features to be assigned a colour or style based on the value of an attribute OS MasterMap Topography Layer has both the structure and attribution to make it relatively quick to produce such maps The result is data that is easier to customise easier to interpret and more eye catching X 980 1 590 m 780 980 m 770 780 m l uo x e 530 770 m PA AKSEN US Set it i i Figure 10 thematic mapping with OS MasterMap Topography Layer One of the barriers to customers making greater use of both their own data and data they may wish to share with other Ordnance Survey customers is being able to link the datasets together To be able to link or associate datasets together normally requires each dataset to have a common reference one piece of information that is in all datasets OS MasterMap Topography Layer can help to create links between customers own datasets and OS MasterMa
165. ography Layer technical specification annexe A v1 9 12 2010 Crown copyright Page 108 of 142 generalised Generalisation is the task of deriving maps or geodata products at a smaller scale starting with more detailed existing mapping or source data It involves exaggerating those aspects that are important for a particular purpose and scale and removing irrelevant detail that would clutter the product and confuse the user georectified imagery The georectification method is a very simple process that uses detail points visible in the image and on the map The image is then warped to fit the map on those points There is no information to ensure that the image fits the map elsewhere GML Geography Markup Language An XML encoding for the transport and storage of geographic information including both the geometry and attributes of geographic features GPS Global Positioning System A satellite based navigational system allowing the determination of any point on the Earth s surface with a high degree of accuracy given a suitable GPS receiver ground surface level The definition of ground surface level is usually self evident Where more than one level of detail exists ground surface level is defined as the lowest level of surveyable detail that can be surveyed in relation to other detail but is not underground Those features that are less than 0 3 m in height are given different coding to distinguish them from those above 0 3 m These
166. on are collectively Known as the text rendering attributes They are reguired to graphically display a text string in harmony with the underlying map detail Font The font that is to be used to display the text string More information is available in the technical specification Orientation The orientation of text or symbol features for cartographic placement This is measured in tenths of a degree anticlockwise from due east 0 3599 OS MasterMap Topography Layer user guide chapter 5 v1 9 12 2010 Crown copyright Page 44 of 142 Height The height of cartographic text The height is expressed as the distance on the ground covered by the text in metres Anchor position A number between 0 and 8 that specifies which part of the text is bound to the anchor point Further explanation is given in the technical specification Text string Cartographic text that can be rendered using the four text rendering attributes explained above Geometric attributes Point A pair of easting and northing coordinates in metres defining a horizontal location in the British National Grid spatial reference system Polygon A polygon is a single closed region defined by a set of lines that represent the boundaries Polyline A polyline is an ordered set of points forming a line feature This chapter has explained how OS MasterMap Topography Layer features belong to one of six feature types and shown how each feature type has its own set of
167. oncept called Digital National Framework DNF DNF is a model for an industry standard way of integrating and sharing business and GI from multiple sources Gl increasingly needs to underpin mainstream information services yet it has proved difficult for it to move from a niche or specialised data type Ordnance Survey has recognised that GI needs to move from simple and relatively unintelligent maps and pictures to computer records that mainstream information technologies can recognise and handle logically reliably and in increasingly automated processes OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 8 of 142 The idea behind DNF is to enable better integration of all kinds of information with location as the common denominator Within the confines of information technology the best way of achieving this is to link multiple information sources to a definitive location by having a common reference for each geographic feature by giving them all unique identifiers Within OS MasterMap layers there is a set of unique references for geographic features TOIDs that are managed and maintained to a consistent published standard Each referenced feature may be viewed as a building block for any GI application a customer wishes Ultimately this has the potential to evolve into a network of information that while distributed when brought together can be used with assurance Business information can then be
168. ons OS MasterMap Topography Layer technical specification annexe A v1 9 12 2010 Crown copyright Page 107 of 142 customer An organisation or individual that makes use of Ordnance Survey s data supply facilities This includes both direct sales customers of Ordnance Survey and Ordnance Survey Mapping and Data Centres as well as customers of Licensed Partners It does not include anyone or any organisation that has access to Ordnance Survey material without charge dataset An identifiable set of data that share common characteristics and that are managed as a subset of the data within a database delivery mechanism The method of supply of data to a customer for example offline and online departed feature A feature supplied as part of a COU supply that has either been deleted has changed theme or has moved outside of the area of interest since the specified change date descriptive group Attribute with descriptive information about the feature descriptive text Descriptive text is defined within the Topography Layer as a generic name given to a feature where a distinctive name does not apply for example drain boundary post or car park Where the function or purpose of some features are not clear it is possible that they will be described with both a distinctive and descriptive name for example Sandy Lane Track or Old Thatched House PH descriptive term Attribute with descriptive information about the feature Dig
169. or administrative boundary for example European region county ward civil parish and so on NOTE the physicalPresence for a BoundaryLine will always be Boundary Closing Feature not physically present This may have been surveyed or inferred to close a polygon for reasons of classification or identity Edge Limit The feature is a physical definition of the edge of an area but does not obstruct pedestrian access Extent The feature identifies a geographic area with unknown or poorly defined limits Indicator The feature is a symbolic representation of the characteristics of physical features for example direction of river flow or site of a heritage feature Minor Detail The feature is subsidiary to surrounding detail Moveable Indicates that the object can move within the extent of the feature for example a moveable crane Network Feature represented is part of a transport network for example narrow gauge railway track Obstructing Indicates that feature is normally more than 0 3 m high and forms an obstruction to passage on foot Overhead This value indicates that the alignment of a feature is defined by something that is above the physical level of the feature For example this value is used if part of a building is on stilts In that case the PhysicalLevel attribute would be 50 normal cartographic level OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 86 of
170. outs central reservations and cycle paths Political or Features representing political Administrative European county district administrative or electoral boundaries Boundary ward and civil parish boundaries boundary stones and boundary mereing symbols Rail Features representing Rail Rail alignments describing or limiting the extents of railways permanent way and railway land OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 37 of 142 Value of descriptive group attribute Description of value Theme Examples Road or track Features representing describing or limiting the extents of roadways and tracks Roads tracks and paths Road sections roundabouts and central reservations Roadside Features representing Road tracks and Road sections describing or limiting the paths roundabouts central extents of roadside detail reservations and cycle paths Structure Features representing describing Structures Chimneys pylons masts or limiting structures other than bridges gantries and buildings or glasshouses tunnels Terrain and height Features giving information Terrain and Spot height about the altitude at a location height or changes of level of the ground surface Tidal water Features representing Water Tidelines describing or limiting areas of water that are tidal Unclassified Topographic features that have
171. p Topography Layer eene 15 iilis cH na a wd Cy wn Aw Cg Cany ND YY SF dd OR 16 ADPlICAtlON EE 18 Feature life cycles and tracking Change ccccsseccecesseeeeeeeeeeseeeseeeseeeseeeseeeseeaeseeeseenseeesees 19 Life cycle DE 19 Unique feature references TOIDS cccccecceceeeseeeeeeeeceeeeeeaeeceeeesaeeesaaeeeeaeeseaeeessaeeessaeenenees 19 Feature version pnumbers nennen nennen nennen tns r einen 20 Feature version date 21 Life Cycle rules 0 cece ee cet nn YL L eee LEL eee eee LLALL YEELLL HL ELLL YNN eee LA HYLL ELLA ELE LLAN DE EL AARAA AAAA AEEA anaana 21 Polygon feature life cycle rules YY LLC LLALL LLALL LLALL LLALL nemen 21 Creation of polygon features due to real world change 21 Deletion of polygon features due to real world change nnr L Yrru LI nno 21 Modification of polygon features due to real world change ure I Y iH 22 Changes to geometry of polygon features 22 Splitting of polygon features nnr YL LLY YL LLL LA L LY HYLL LL LL LLA YL YR HYLL LLE ELLY YR LFn nn H 22 Joining of polygon features 23 Change of polygon feature Cassiftcatton nee nnr LL FLY LLIF uen nno 23 Modification of polygon features due to error correction uueuieeusi eiu I iH 24 Line feature life cycle rules A 24 Inferred linKS seem 25 Creation of A ET 25 Deletion of line features LLY YL HHLY HYLL YL LL LLARY ELLYLL LL LYN rnnt 25 Modification of line features due to real world change 26 Modification o
172. p features by using the TOID as a common reference In this way OS MasterMap Topography Layer provides a foundation dataset for a Digital National Framework that aims to help users of spatial data to derive more value by associating datasets together Using a common reference can also provide such benefits to an organisation as removing ambiguity over a feature s identity and allowing the faster retrieval of data when querying or analysing the data OS MasterMap Topography Layer user guide chapter 2 v1 9 12 2010 Crown copyright Page 17 of 142 Applications OS MasterMap Topography Layer is used extensively by businesses and organisations that need to relate their activities and or their assets to the physical environment One of the most common uses for the product is by organisations that have their own GI and wish to examine it in relation to the real world around them An example would be utility companies that have assets both at surface and below surface level They freguently need to visit these assets either for repair maintenance or to add new assets By viewing their infrastructure against the features in OS MasterMap Topography Layer it helps their crews locate the assets know what the area is like before they leave their depot and allows them to provide a better customer service by identifying those nearby premises that need to be contacted about the works Taking this a stage further many organisations need to derive their own G
173. parenthesis Right parenthesis Asterisk Comma Hyphen minus Full stop Slash also known as Solidus Colon i Semicolon A Less than sign Eguals sign More than sign Guestion mark Commercial at Left sguare bracket Backslash also known as Reverse solidus Right sguare bracket gt gt 7 A Circumflex also known as Caret Underscore also known as Low line Grave Left curly bracket Vertical line w m a Right curly bracket Tilde Cent sign l Pound sign M ce Plus sign OS MasterMap Topography Layer technical specification annexe D v1 9 12 2010 Crown copyright Page 141 of 142 Acute accent on the following for example AEIOU aehioru Grave accent on the following for example ABDEIMORU acdeghilmnorstuwy Circumflex on the following for example ABCDEGILMOPRSTUWY acdegilnoruwy Diaeresis on the following for example AEIOU aeiou OS MasterMap Topography Layer technical specification annexe D v1 9 12 2010 Crown copyright Page 142 of 142
174. pose for which it is licensed to your organisation or business but not otherwise No part of this specification may be reproduced or transmitted in any form or by any means including electronically for commercial exploitation without the prior written consent of Ordnance Survey No part of this specification may be copied or incorporated in products services or publications that you generate for onward sale or as free promotional or support materials without the prior written consent of Ordnance Survey OS MasterMap Topography Layer technical specification introduction v1 9 12 2010 Crown copyright Page 66 of 142 Chapter1 Key concepts This section outlines the three core concepts underlying the OS MasterMap vision as it relates to the provision of topographic features These are e a feature model with identifiable persistent features e feature life cycles defined to best match actual change and e integrated OS MasterMap layers Feature model In Ordnance Survey s view the world is full of features that have identity location and other additional attribution It is this sense of feature that is central to the development of OS MasterMap as a database of features that are a useful reference base for users Attribution Identity Feature life cycles Changes to real world features conforming to the specification are reflected in changes to the data The OS MasterMap capture specifications define what real world ch
175. pplied via the OS MasterMap online service Themes The product can only be purchased as an integrated set of all themes although users can select which themes get delivered to them Format The product is available in GML format only File compression is performed using the UNIX gzip utility Chunking Data can be supplied as geographic or non geographic chunks Geographic chunking is performed using standard Ordnance Survey National Grid military grid Area selection Customers can define their area of interest AOI using predefined or customer defined polygons Predefined National sets A national set of the Topography Layer data is extracted from the database at the beginning of each six week cycle and stored on hard disk to create customer orders from Partial sets These will be created on demand Customers are able to select from the following areas e Countries e Postcode areas for example SO e Counties e Govt Office Regions England e London boroughs e Great Britain e Metropolitan districts e Metropolitan counties e Unitary authorities e M25 motorway with 2 km buffer e Districts Customer defined Customers may provide their own AOI in any standard GIS format Filename convention The convention determines that the filenames are constructed from the following parts Order number Only present for specific orders Not present for national datasets Sequence number The sequence number is provided
176. r is a dynamic element within the landscape certain survey principles and constraints are imposed on the representation of water within OS MasterMap Topography Layer Rivers streams and drains are shown at their true scale width A single line is normally used where their width is less than e 1 0 min urban areas and e 2 0 min rural mountain and moorland areas OS MasterMap Topography Layer does not contain polygons of the open sea Where inland water bodies meet the sea the following principles are applied e Ordnance Survey shows high and low water marks of a mean average tide that is an average tide halfway between spring and neap tides in England and Wales and of average spring tides in Scotland e In tidal rivers the point to which mean tides or spring tides in Scotland flow at high or low water is included Lakes and ponds are surveyed at normal winter level reservoirs are shown at top water level that is spillover level All water features are described Continuous topographical water features that extend into private gardens are shown Where a river flows under another object typically a bridge the part of the river beneath the object is not supplied This is why there are gaps in rivers when the theme is viewed on its own This is shown in figures 18 and 19 below OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 35 of 142 Figure 18 the depiction of water and bridg
177. r2 Data specification overview Structure This data specification works within the existing structure of OS MasterMap as represented in the Unified Modelling Language UML class diagram below for example Topography 1 1 for example Building ae 1 for example topograpl Attribute for example TOID Layers A layer is a set of related OS MasterMap themes that can be used together for end user applications A layer may consist of one or more themes Themes Within the Topography Layer features belong to one or more themes A theme is a logical collection of features that have been grouped according to their classification or relationship with other features The primary purpose of themes is to enable easier selection and use of features by the user Themes do not form part of the classification of a feature and do not affect the feature life cycle rules The Topography Layer is composed of nine themes which are detailed in chapter 3 Theme definitions Features Features are digital representations of real world concepts The life cycle of a feature its creation modification and deletion are managed to most appropriately reflect the life cycle of the abstracted real world concept they depict Attributes An attribute is any item of information packaged in an OS MasterMap feature The TOID and the geometry of the feature are both attributes of the feature OS MasterMap Topography Layer tech
178. real world polygon objects are merged by the removal of physical boundaries it may be that one of the original real world objects is clearly recognisable as subsuming the other s If that is the case the feature representing the dominant real world object is retained and the other feature s deleted If one of the original real world objects is not clearly dominant the following considerations are used as a guideline to determine whether a feature is retained e Is the function of the resultant real world object the same as one of the originals e Can one of the original real world objects be considered the obvious predecessor to the resultant real world object e Is the area of the resultant real world object less than twice that of one of the original real world objects If the continuation of the feature cannot be justified on one or more of these grounds all the original features are deleted and replaced with new features Examples e Two fields one of which is larger than the other are merged into one such that the resultant real world object is recognisable as the larger field subsuming the smaller field The feature representing the larger field is retained The smaller field feature is deleted e_ Three fields which are broadly similar in size are merged into one such that none of the original fields are recognisable as the obvious predecessor of the resultant field The original features are deleted and a new feature is crea
179. reclassified to descriptive group of building The feature is retained The feature version number is incremented e A feature is no longer included within Ordnance Survey s capture specification The feature is not retained Line feature life cycle rules Line features in OS MasterMap are not as persistent in the same way as polygon and point features This is because line features are maintained by what are called topological structuring rules These are explained in more detail in the technical specification In short this means that if a line feature is intersected by another line it is broken at the intersection This means that a single linear real world object is often represented by several line features no real world object should ever be made up with a partial line feature There is no concept in OS MasterMap of a line feature that is made up of multiple line geometry elements An illustration of this rule is shown in figure 13 A fence cuts a field into two real world objects A new fence is built at right angles to the original to further divide one half of the field Although the old fence has not changed at all it will be split into two separate line features Before Two real world objects one line feature After Three real world objects three line features Figure 13 line life cycle rules As there is no recorded relationship between OS MasterMap line features and in particular discrete real world objects
180. res the reasons behind its development and some of the many applications in which it may be used The next chapter looks at the concept of the feature life cycles Understanding life cycles is key to managing the features within a computer system OS MasterMap Topography Layer user guide chapter 2 v1 9 12 2010 Crown copyright Page 18 of 142 Chapter3 Feature life cycles and tracking change The features within OS MasterMap vector layers are viewed as having a life cycle The life cycle of each feature is matched where practically possible to that of the real world object it represents For example a new building will become a new object in the Ordnance Survey main holding of the data and will be treated as the same feature even if it undergoes change until the building is demolished By adopting this approach Ordnance Survey is emulating real world behaviour within a digital model and therefore creating a more realistic version of the real world in a computer Life cycle rules Feature life cycles are established and maintained in accordance with a set of rules details of which can be found later in this chapter Essentially these rules indicate when an OS MasterMap feature will be retained and when it will be replaced for different types of feature and different change scenarios These rules are not only there to guide surveyors from Ordnance Survey collecting and attributing the features but also to provide customers with a co
181. rground railways that are open to the sky are currently shown The physical features shown in the rail theme include e_ level crossings e lighting towers e loading gauges e turntables e mile or kilometre posts and stones e sand drags e signal posts bridges and gantries e switches and slips e retarders e bridges and viaducts e mail pick ups e rails e permanent way and e station buildings and platforms Some physical features are not shown in the rail theme These include e telephones associated with level crossings e conductor rails and overhead wires for electrified trains e detail beneath the roofs of railway stations e water troughs and e repetitive features such as signal lights within marshalling yards Some non physical features are shown in the rail theme These are text descriptions of railway and associated railway features Roads tracks and paths Roads For Ordnance Survey purposes a road is defined as a metalled way for vehicles Roads that form part of the public network and driveways to private properties that are over 100 metres in length are normally included with the Topography Layer OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 31 of 142 Tracks A track for Ordnance Survey purposes is defined as an unmetalled way that is clearly marked permanent and used by vehicles Tracks are only normally recorded in private gardens if the
182. ribute provided with OS MasterMap Topography Layer features and its purpose or value to the customer The ranges of values that are associated with the attribute are listed in the technical specification Each feature type has a different combination of attributes Some are optional and some may occur multiple times on the same feature Table 4 shows the attribution available with each feature type Many attributes are common to all features but some are specific to a particular type OS MasterMap Topography Layer user guide chapter 5_v1 9 12 2010 Crown copyright Page 40 of 142 Table 4 Attribution by feature type Attribute Topographic Topographic Boundary Topographic Cartographic Cartographic area line line point symbol text Accuracy of d d height above ground level Accuracy of d d height above datum Accuracy of d d d position Anchor point 4 Anchor position d Broken d d Calculated area d value Change date d d 4 d s 4 Descriptive group d d d d s d Descriptive term d d d d s d Feature code d d d d d d Font d Height d Height above 4 d datum Height above d d ground level Make d d d d Non bounding d line Orientation d d Physical level d d d d 4 d Physical d d 4 d s 4 presence Point d d Polygon d Polyline d d Reason for d d d d s d Change Reference to d feature Theme d d 4 d s d TO
183. rmanent This includes permanent roofed constructions that exceed 8 0 m in area 12 0 m in private gardens Exceptions are made to this area rule for smaller buildings that due to their detached position form relatively important topographic features These are shown at minimum size as stated above With a few exceptions for example by describing government offices or hypermarkets no distinction is currently made between residential private public commercial or industrial buildings Physical features shown in the buildings theme e roofed buildings of sufficient size or importance to be shown e mobile or park homes that are permanent residential and have a postal address e archways and covered passageways where the alignment can be determined from outside the building e horticultural glasshouses over 50 m and e covered tanks Features such as cooling towers uncovered tanks bridges and monuments are shown within the structures theme The specification for the capture of glasshouses has recently been clarified Only glasshouses over 50 m that serve a horticultural purpose will continue to be captured as glass structures Other glass structures such as office buildings and conservatories exist within OS MasterMap and will be recorded as buildings There are some non physical features shown in the buildings theme represented as the following text features e house numbers e_ descriptive building names and e distinctive b
184. rty application logic multiple descriptive femmt 101 TopographicLine and Boundarvl me 102 Mapping table 102 Property application Joo 103 Topograpbichoint RR 103 CartographicText sssssssessssesseeeen eene LL LLAN ELLYLL A nenn inen renr inen nennen nennen enne 104 CartographicSymbol sse nennen enne AEL ELE L AEL LEL entere nennen nnn nnns 104 Data supply servie icr cinco iren eiou Eee kk Dr kan ao Rh SR EE RR ER EE GAFN NWN NX LE REBR SEES E RR RE DNW R RHOD 105 RE 105 Ile M O Dd DN WYD GANFED O A AWAY 105 CRUNKING PR 105 Area selection m 105 e Ge El e DEE 105 Eege Ee EE 105 Filename Convention 105 MOSS ANY E 107 eio e UE 114 Cartographic style definitions 2 1 perire er tee bere ted inte M ET en EC UD 116 Cellule EE 116 Use of coordinates stroke widths and text sizes eie Y YY Y Y Y YL LL Y YFFLnn 116 Colour palette EE 116 a GT HR FARRAU EP AE RF ands GAF CR FEE NESAF NR HF ER RR HF GORFU 116 OS MasterMap Topography Layer technical specification contents v1 9 12 2010 Crown copyright Page 64 of 142 Annexe D a VIDE eege RR NAF RY YRR EEO NHY NU EFE FF ege EEN 116 Point svmbols LLALL LLE AE nemen n entere ADD LL ENKE 116 RUE ue EE 116 EEEE e OU dee ID GU OND AD DDO 117 Colour polette ee 117 OMG GA a LD gg 118 Shared symbol geometry LLALL LLE A LLY LLALL LLALL ELE AELE ELL ALL EL LLALL EL RY nnns 118 Point SYM
185. s applied This may be for one of several reasons which include e Information is already rendered by another feature e Information is not easily positioned or styled e The information if drawn would be cluttered or confusing e The information is structural in the data but adds little value for the user by its cartographic depiction TopographicArea Mapping table no or single descriptiveTerm descriptiveGroup descriptiveTerm make Style name Building Manmade buildingFill Building Archway Manmade buildingFill General Surface Manmade madeSurfaceFill General Surface Multiple multipleSurfaceFill General Surface Natural naturalSurfaceFill General Surface Unknown madeSurfaceFill General Surface Multi Surface Multiple multipleSurfaceFill General Surface Step Manmade stepFill Glasshouse Manmade glasshouseFill Inland Water Natural inlandWaterFill Landform Manmade manmadeLandformPattern Landform Natural naturalLandformPattern Landform Cliff Natural naturalLandformPattern Landform Slope Manmade manmadeLandformPattern Natural Environment Boulders Natural naturalEnvironmentFill and bouldersPattern Natural Environment Boulders Scattered Natural naturalEnvironmentFill and scatteredBouldersPattern Natural Environment Coniferous Trees Natural naturalEnvironmentFill and coniferousTreesPattern
186. s Coniferous Trees Scattered Coppice Or Osiers County Course Of Heritage Culvert Direction Of Flow District Disused Feature Division Electoral descriptiveTerm Foreshore Heath Inferred Property Closing Link Marsh Reeds Or Salt marsh Mean High Water Springs Mean Low Water Springs Multi Surface Narrow Gauge Nonconiferous Trees Nonconiferous Trees Scattered Orchard Outline Overhead Construction Parish Parliamentary Polygon Closing Link Positioned Boulder Positioned Coniferous Tree Positioned Nonconiferous Tree Public Pylon Ridge Or Rock Line descriptiveTerm Road Name Or Classification Road Related Flow Rock Rock Scattered Rough Grassland Scree Scrub Site Of Heritage Slope Spot Height Standard Gauge Track Step Structure Switch Top Of Cliff Top Of Slope Track Traffic Calming Triangulation Point Or Pillar Tunnel Edge Unmade Path Alignment Upper Level Of Communication OS MasterMap Topography Layer technical specification chapter 6 v1 9 12 2010 Crown copyright Page 81 of 142 The following table clarifies the usage of selected descriptive terms Value Description Archway A covered passageway through a building or structure that vehicles can be driven through Compound Indicates that the feature covers a geographical area and encompasses a mixture of other features Course Of Heritage The alignment of a heritage or antiguity feature for example the course of
187. s ensure that vertices of the geometry of features are coincident where they should be so that the features topologically structure with each other The full structuring layer definitions are given in the following table Structuring layer Rule Topography Feature Type TopographicLine or TopographicArea descriptiveGroup not equal to Landform physicalLevel 50 physicalPresence Closing Edge Limit Obstructing Overhead or Moveable Landform Feature Type TopographicLine or TopographicArea descriptiveGroup Landform physicalPresence Closing Edge Limit Obstructing or Overhead Pylons Feature Type TopographicLine or TopographicArea physicalLevel 51 physicalPresence Closing Edge Limit Obstructing or Overhead Boundaries Feature Type BoundaryLine or CartographicSymbol descriptiveGroup Political Or Administrative Seamless data supply A principle of OS MasterMap is that data is seamless that is there are no fixed units of data supply The nominal boundary of each packet of OS MasterMap data is defined by the user s data selection polygon and by the data chunking method applied to break the supply into manageable units if used With respect to the nominal boundary data is supplied unclipped This means that all features with geometry that overlaps the nominal boundary are s
188. s of the control point can be obtained from Ordnance Survey see below All triangulation stations are shown except for buried and surface blocks Spot height These are non physical points the altitude of which relative to Ordnance Datum has been determined by levelling All current spot heights are shown by a point feature or symbol The altitude to one decimal place of a metre is shown by a textual description The latest information on Ordnance Survey s GPS triangulation and control points can be found at http www ordnancesurvey co uk oswebsite gps Bench marks are represented in the Topography Layer as a symbol to mark their position The values for these bench marks are available from http benchmarks ordnancesurvey co uk It should be noted that the bench mark information is historic and Ordnance Survey cannot guarantee its accuracy Water Water features are defined as features that contain delimit or relate to real world objects containing water The physical water features shown in OS MasterMap Topography Layer include e mean high water springs and mean low water springs e swimming pools ponds lakes and lochs e moats bridges and footbridges e reservoirs rivers canals and streams e drains and ditches e foreshore features e floating objects they are only shown when they are fixed and attached to permanent detail e shake holes and swallow holes in mountain and moorland areas limits of numerous shake
189. s smallNonconiferousTreeFillSymbol To produce a particular pattern the appropriate fill symbol is distributed on a grid that is repeated to cover the polygon being drawn Currently the following grids are in use Landform grid Size 25 25 Suitable symbols manmadeLandformFillSymbol naturalLandformFillSymbol Symbol coordinates 0 21 0 18 0 15 0 12 0 9 0 6 0 3 0 0 0 3 0 6 0 9 0 12 0 15 0 18 0 21 Fill colour none Patterns manmadeLandformPattern naturalLandformPattern OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 134 of 142 Small regular grid Size 3 3 Suitable symbols foreshoreFillSymbol multiVegetationFillSymbol Symbol coordinates 2 2 Fill colour for foreshorePattern ccffff RGB 204 255 255 otherwise ccffcc RGB 204 255 204 Patterns foreshorePattern multiVegetationPattern Regular grid Size 6 6 Suitable symbols orchardFillSymbol Symbol coordinates 3 3 Fill colour ccffcc RGB 204 255 204 Patterns orchardPattern Natural environment grid Size 50 50 Suitable symbols All natural vegetation and surface cover symbol types except for orchard Symbol coordinates 5 3 5 25 10 12 10 35 25 45 42 15 37 27 27 14 36 37 42 45 39 3 18 33 Fill colour ccffcc RGB 204 255 204 Patterns roughGrassPattern heathPattern marshPattern scatteredBouldersPattern scatteredRocksPattern scatteredConiferousTreesPattern scatteredNonconiferousTree
190. s supplied in GML an open format rather than an Ordnance Survey specific one An online ordering system has been developed for customers to place and manage their orders The data can be delivered electronically or on digital media When ordering OS MasterMap Topography Layer there are no artificial divisions in the data caused by a tile based unit of supply OS MasterMap Topography Layer is supplied as a seamless dataset In the following chapters of this user guide these new concepts are explained in more detail The reasons behind the concepts where appropriate are given along with indications of the benefits they may bring and the possible considerations for a customer s use of the product Firstly the purpose for introducing this type of product and some typical applications for the product are outlined in the rest of this chapter Purpose OS MasterMap Topography Layer has been developed in response to the need for a national topographic dataset that offers customers a more sophisticated type of data that represented the world in a more realistic way and was more aligned to the increasing use and functionality of GIS and spatial database technology within organisations Its primary purpose is to provide the most detailed topographic data available of the physical environment of Great Britain It is regularly updated by ground and aerial survey to published schedules and capture standards In addition OS MasterMap Topography Layer may
191. sPattern coppicePattern orchardPattern bouldersPattern rocksPattern screePattern scrubPattern coniferous TreesPattern nonconiferousTreesPattern coniferous TreesAndScatteredRocksPattern coniferous TreesAndScrubPattern heathAndScrubPattern heathAndScatteredRocksPattern nonconiferousTreesAndConiferousTreesPattern nonconiferousTreesAndCoppicePattern nonconiferousTreesAndScatteredRocksPattern nonconiferousTreesAndScrubPattern roughGrassAndBouldersPattern roughGrassAndConiferousTreesPattern OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 135 of 142 roughGrassAndHeathPattern roughGrassAndMarshPattern roughGrassAndNonconiferousTreesPattern roughGrassAndRocksPattern roughGrassAndScatteredBouldersPattern roughGrassAndScatteredNonconiferousTreesPattern roughGrassAndScatteredRocksPattern roughGrassAndScrubPattern scatteredNonconiferousTreesAndScatteredConiferousTreesPattern scrubAndScatteredNonconiferousTreesPattern rocksRoughGrassAndBouldersPattern roughGrassNonconiferousTreesAndConiferousTreesPattern roughGrassNonconiferousTreesAndScrubPattern roughGrassScatteredRocksAndBouldersPattern roughGrassScatteredRocksAndHeathPattern roughGrassScatteredRocksAndScatteredBouldersPattern roughGrassScatteredNonconiferousTreesAndScrubPattern scrubConiferousTreesAndNonconiferousTreesPattern scrubNonconiferousTreesAndCoppicePattern scatteredConiferousTreesScatteredNonconiferousTreesAndScrubPattern Exa
192. stance from a settlement or main road Emergency planners may use OS MasterMap Topography Layer to assist in planning and preparing for emergencies by identifying the areas most likely to be affected or for modelling the seguence of events in any given type of emergency so that their own resources and command centres are unlikely to be cut off or taken out of action by the emergency itself As OS MasterMap Topography Layer is easy to customise in terms of how it looks it is often used as a way of communicating Gl in reports and presentations GI can be conveyed more clearly in a map than by text or tables making it easier to get points across to many different types of audience whether they are key decision makers people inside the organisation or members of the public It should be noted that the ability of an organisation to develop any or all of the applications listed above will depend in part on the systems they use Most GIS are capable of performing to a greater or lesser degree the applications listed above Table 2 below gives examples of other applications that freguently use OS MasterMap Topography Layer Table 2 Land management and property development Environmental monitoring Site planning Tourism and promotional material Citizen services Risk assessment Location based services on mobile devices Customer service centres This chapter has provided a detailed introduction to OS MasterMap Topography Layer including its main featu
193. structions that are not buildings These may or may not obstruct passage at ground level Theme rule descriptiveGroup Structure Examples Pylons and general structures Terrain and height Description This includes terrain related features some of which have associated heights that is spot heights Theme rule Features that have the optional property HeightAboveDatum or descriptiveGroup Terrain And Height or Height Control Examples Spot heights tidelines and bench marks OS MasterMap Topography Layer technical specification chapter 3 v1 9 12 2010 Crown copyright Page 70 of 142 Chapter 4 Feature attribution In OS MasterMap Topography Layer features are classified using feature type and feature description attributes This section describes the feature types and shows their permitted attribution Feature type The Topographic Layer contains not only physically apparent real world objects but also topographic concepts such as inferred area feature boundaries There are six types of feature used to represent geospatial information in the Topography Layer they are TopographicArea TopographicLine BoundaryLine TopographicPoint CartographicSymbol CartographicText Features representing topographic objects that have a polygon based geometry Features representing topographic objects and concepts that have a line based geometry Features representing the boundaries of administrative
194. structures descriptive Term String This attribute if present gives further classification information about the feature A feature may have multiple descriptiveTerm attributes but this is little used at present Most features have zero or one descriptiveTerm attributes A situation where multiple descriptiveTerm attributes are used is where area features have a descriptiveGroup with the value of Natural Environment These features can have one or more descriptiveTerm attributes specifying the natural land cover types present in the area featureCode String Topographic features have a numerical feature code a five digit integer assigned to each feature This feature code is wholly determined by the feature type see Feature type earlier in this chapter the descriptive group s and the descriptive term s The feature code does not add any information to that contained in these attributes The physicalLevel physicalPresence and make attributes do not affect the feature code The feature code itself is arbitrarily assigned and is therefore not informative without the look up table that gives the feature type and attribute values corresponding to each feature code This table is in the section Attribute values featureCode in chapter 5 OS MasterMap Topography Layer technical specification chapter 5_v1 9 12 2010 Crown copyright Page 76 of 142 Simple attribute name Type Description
195. styling based and adapted from the guide that can be applied when the data is initially translated so that the data can be displayed immediately with a coherent style Within most GIS however there are tools that enable customers to choose to make the data appear in any preferred manner A customer can apply their own colours styles and symbols based on the same three attributes Alternatively they can use any of the attributes either in isolation or in tandem if their systems permit to render the data to their own specification Attaining a coherent style depends on choosing the attributes carefully There is little point in using the TOID for example as each feature would need its own colour If the TOID version number was used a customer could get some idea of how much change there goes on in one area compared with another In figure 27 below the darker the red the higher the version number and therefore the greater the t amount of surveyed change 7 TT FF H AULT o sp Er Me ELE aA Ze xm ti DE Weu HT krg TENE yy E TT EN UE AEA Wy H UI n ur L zk a JT Wi Z d e m ger d n C ti LL UU WW iy MH J 14 ES bitte LG fi MLSs ESFE fee FR Ze ln pex MOD el Jee EE RAL IC enam a H LET i Se WEST THI MER SEERE PYTYN EE WE A ELE IE E 301 iel me ce ae Wedd Sere dd sen Ke di Wedd inj il In jj i A ie
196. sually be 8 m or more e traffic calming measures forming a physical obstruction including pinch points e dedicated cycle lanes e fords e car parks e edges or centre alignments of tracks and paths and e the treads of steps e Road furniture e mile posts e guideposts traditional fingerposts only e kerb barriers e gates across roads e posts preventing vehicular access e weighbridges and e cattle grids e Road bounding features e hedges walls fences and banks and e crash barriers where they form the sole bounding feature of a carriageway Non physical features shown in this theme are descriptive and distinctive text and inferred links OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 32 of 142 There are two situations where constraints on how the features are depicted are normally imposed by survey tolerances e Where the central alignment of an unmade path is less than 1 m urban areas or 2 m rural and moorland from an adjacent building fence hedge or wall the central alignment is shown at that minimum distance away from the feature e Where one edge of a track is parallel and close to the bank of a water feature the track edge nearest to the river is omitted It is important to note that rights of way are not identified in the Topography Layer The representation of a road track or path is no evidence of a right of way Structures These are defined as features
197. system e Check holding using FVDS at appropriate intervals to ensure currency and consistency of data holdings OS MasterMap Topography Layer technical specification chapter 8 v1 9 12 2010 Crown copyright Page 93 of 142 Chapter9 GML output format The OS MasterMap Topography Layer product is supplied in Geography Markup Language GML version 2 1 2 This chapter describes how OS MasterMap is defined in GML An understanding of XML eXtensible Mark up Language and XML schemas is reguired GML overview Topography Layer related information The following chapters contain the definitions of the data content supplied in GML format Chapter 4 Feature attribution Chapter 7 Geometry and topology Chapter 8 Change only update The following Open GIS Consortium OGC document is reguired to use this chapter Geography Markup Language v2 1 2 The XML specifications that GML is based on are available from the World Wide Web Consortium W3C website http www w3 org Information about Unicode and UTF 8 the character encoding we have chosen is available on the Unicode Consortium website http www unicode org Use of examples Any examples in this chapter that mention specific data content are to be taken as examples only All data content is defined in the Topography Layer separately and the examples are not necessarily in harmony with the data specification Clarification of terms used in this chapter Feature attribute Attribu
198. t osgb descriptiveGroup gt lt osgb calculatedAreaValue gt 13254 lt osgb calculatedAreaValue gt lt osgb referenceToFeature xlink href 40sgb5798572675343543 Geometry A geometric property is one that describes a specific geometry All geometric properties are encoded according to the GML specification We have extended the GML v2 1 2 specification to include a rectangle that is defined by two points The first point defines the minimum coordinate whilst the second point defines the maximum coordinate All geometric properties are encoded by placing the GML geometry elements inside an element that takes its name from the feature attribute The XML attribute srsName shall be set to osgb BNG BNG stands for British National Grid which uses eastings and northings specified in metres If a line is broken or a polygon has bled into another because of a partial update see chapter 7 Geometry and topology then the XML attribute broken shall be set to true A line that is broken will be encoded as a gml MultiLinestring All polygon outer boundaries have an anticlockwise orientation and all inner boundaries have a clockwise orientation For example lt osgb anchorPoint gt lt gml Point srsName osgb BNG gt lt gml coordinates gt l2365 563 8975 676 lt gml coordinates gt lt gml Point gt lt osgb anchorPoint gt lt osgb gueryExtent gt lt osgb Rectangle srsName osgb BNG gt lt gml coordinates gt 0 0 700000 13000
199. t not otherwise No part of this guide may be reproduced or transmitted in any form or by any means including electronically for commercial exploitation without the prior written consent of Ordnance Survey No part of this guide may be copied or incorporated in products services or publications that you generate for onward sale or as free promotional or support materials without the prior written consent of Ordnance Survey Data copyright and other intellectual property rights The Crown or where applicable Ordnance Survey s suppliers owns the intellectual property rights in Ordnance Survey digital map data Full details of the terms and conditions under which Ordnance Survey digital map data may be processed and or manipulated or copied by a customer whether or not for use on PCs or workstations or for making hard copies are available from the Customer Service Centre please see contact details You should check the terms and conditions with us before using the data It is also the responsibility of the holder of the digital map data to ensure that any plotted or printed output contains the reguired copyright and database acknowledgements in a conspicuous position Trademarks Ordnance Survey the OS Symbol OSGB36 OS MasterMap TOID and OS Net are registered trademarks and Integrated Transport Network is a trademark of Ordnance Survey the national mapping agency of Great Britain Acrobat Reader and Adobe are registered tr
200. t of large areas easier data is split into chunks each of which covers a nominal sguare area or part of such a sguare or a nominated file size Two types of chunks are available geographic and non geographic chunks Chunk boundaries are imposed purely for the purpose of dividing large supply areas into pieces of a manageable size in a geographically meaningful way Both full supply and updates whether COU or full resupply are chunked Geographic chunking option As OS MasterMap data is seamless GML files containing large areas could be very large In order to provide files of a manageable size data supplies are divided into chunks of a user specified size each of which is supplied in a separate GML file Figure 22 below illustrates how geographic chunks work 5 km e Ww Y Figure 22 chunking 1 The customer submits an area or area of interest and specifies a size for the chunks 2 km by 2 km 5 km by 5 km or 10 km by 10 km 2 The online ordering system creates a grid covering the entire area based on the specified size 3 Each square within the grid forms a chunk file 4 Each feature that intersects that square goes into the chunk file 5 National cover of OS MasterMap Topography Layer is supplied in 5 km by 5 km chunks In the case shown in figure 22 ten chunks are created The central chunk is a complete grid square the others are partly bounded by the data selection polygon The upper left square shows the ef
201. t the real world object the feature represents such as its area or its nature Other attributes provide additional information about the feature such as its life cycle and guality Three of the most important pieces of additional information for the vector layers the TOID version and version date are discussed in more detail in chapter 3 OS MasterMap provides attribution that can be searched for and gueried within a GIS Attribution makes it possible to select for example parcels of land that have coniferous tree cover This chapter has outlined the main features of the OS MasterMap product and the data models that underpin the layers It has explained the role OS MasterMap Topography Layer plays both within the OS MasterMap family and within the wider vision Ordnance Survey has of providing a framework for customers to create and derive additional value from their GI The following chapter looks at OS MasterMap Topography Layer in more detail OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 14 of 142 Chapter2 Introduction to OS MasterMap Topography Layer The OS MasterMap Topography Layer contains features that represent objects in the physical environment such as buildings fields fences and letter boxes as well as intangible objects such as county boundaries or the line of mean high water There are over 425 million features in the current product It is available for all of Great Britain
202. tLine stroke width 0 3 OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 138 of 142 Standard gauge rail 333333 Name standardGaugeRailLine stroke width 0 15 m m m m m m m mM N EN NM NM NH M B M BM NM NM FFOOFF Name parishLine stroke width 0 4 stroke dasharray 0 4 0 8 FFOOFF Name electoralLine stroke width 0 2 stroke dasharray 1 5 0 5 Parish Electoral County FFOOFF Name countyLine stroke width 0 4 stroke dasharray 2 0 1 0 Parliamentary Name parliamentaryLine stroke width 0 4 stroke dasharray 1 8 0 5 District FFOOFF Name districtLine stroke width 0 3 stroke dasharray 1 5 0 8 OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 139 of 142 Closing FF0000 rz Name closingLine stroke width 0 05 stroke dasharray 0 5 0 5 o 0 0 H E OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 140 of 142 Annexe D Character set The following is a list of characters and accents that will be found in OS MasterMap Topography Layer data abcdefghijklmnopgrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ 0123456789 Space Exclamation mark Quotation mark Number sign Dollar sign Percent sign amp Ampersand Apostrophe Left
203. te as defined in annexe A Glossary is called a feature attribute XML attribute Attribute as used in an XML context is referred to as an XML attribute Property Most feature attributes are encoded as GML properties property means a GML property Query Each GML output provided by Ordnance Survey is in response to a request for data from a data user The original request from the data user may have been split into multiple requests based on supply requirements for example chunks In this chapter each part of the data request is called a query Extent As part of a request for data the user can specify a polygon or rectangle that delimits the area of data required which is called the query extent in this chapter If the query has been broken down into parts chunks for reasons of supply then the query extent will be the geometry of the partial query Format description XML declaration The XML declaration to all query results is lt xml version 1 0 encoding UTF 8 gt OS MasterMap Topography Layer technical specification chapter 9 v1 9 12 2010 Crown copyright Page 94 of 142 Document type All information returned from a query is provided in an osgb FeatureCollection If no features lie inside a guery then an empty collection is returned with its reguired collection properties The document defines the XML namespaces osgb http www ordnancesurvey co uk xml namespaces osgb gml http www opengis net gm
204. technology infrastructure or last but by no means least the applications OS MasterMap is to be used for However as a minimum the following elements will be reguired in any system e a means of reading the data in its native format or by translating into a file format or for storage in a database e a means of storing and distributing the data perhaps in a database or through a web based service and e away of visualising and querying the data typically a GIS Ordnance Survey has produced a list of guestions to ask system suppliers that may help customers in choosing their system There is also more information on handling OS MasterMap in chapter 6 on the supply of OS MasterMap Currently national cover is available for the Topography Address and ITN Layers The format for most of the data is Geography Markup Language GML Address Layer 2 is available in GML and in comma separated values CSV formats The data is supplied in the zipped format indicated by the suffix GZ at the end of the file name Table 1 below gives the approximate data volumes in the zipped GZ format for national cover Due to the way different systems may store the unzipped data it is not possible to provide file sizes for national cover in the unzipped format Table 1 OS MasterMap data volumes Layer Size Topography 37 Gb Address Layer 0 9 Gb Address Layer 2 2 Gb GML 1 4 Gb CSV Prebuild Address Layer 60 Mb GML 25 Mb CSV ITN 515 Mb OS Mast
205. ted to represent the field e A small pond within a field is filled in The feature representing the pond is deleted and the field feature is retained e Two semi detached cottages of equal size are combined into one dwelling with no alteration to the external geometry of the building Both of the original features are deleted and a new feature is created e A large greenhouse lies within a parcel of land only marginally larger than itself The greenhouse is demolished The feature representing the greenhouse is deleted and the feature representing the land parcel is deleted as it has increased significantly and can no longer be considered as the same object Change of polygon feature classification When a real world object represented by an polygon feature changes such that the nature of the feature changes then the feature is retained unless changes to its geometry indicate deletion of the feature under the guidelines above Alterations due to PAI or any other error correction not linked to real world change are treated as detailed in modification of line features due to error correction later in this chapter Examples e An area of agricultural land is wholly planted with trees there are no changes to its bounding features The descriptive group of the feature changes but its geometry is unchanged The feature is retained e An area of woodland is felled and the area now consists of rough grass and scrub The feature is retained
206. the feature OS MasterMap Topography Layer technical specification annexe A v1 9 12 2010 Crown copyright Page 112 of 142 XML eXtensible Markup Language A flexible way to create common information formats and share both the format and the data on the Internet Intranets and elsewhere XML is extensible because unlike HTML the markup tags are unlimited and self defining XML is a simpler and easier to use subset of the Standard Generalised Markup Language SGML the standard for how to create a document structure OS MasterMap Topography Layer technical specification annexe A v1 9 12 2010 Crown copyright Page 113 of 142 Annexe B GML examples 1 A typical TopographicArea feature as shown in the GML supply lt osgb topographicMember gt lt osgb TopographicArea fid osgbl000002039092674 gt lt osgb featureCode gt 10053 lt osgb featureCode gt lt osgb version gt l lt osgb version gt lt osgb versionDate gt 2001 11 10 lt osgb versionDate gt lt osgb theme gt Land lt osgb theme gt lt osgb calculatedAreaValue gt 624 472992 lt osgb calculatedAreaValue gt lt osgb changeHistory gt lt osgb changeDate gt 2000 07 25 lt osgb changeDate gt lt osgb reasonForChange gt New lt osgb reasonForChange gt lt osgb changeHistory gt lt osgb descriptiveGroup gt General Surface lt osgb descriptiveGroup gt lt osgb descriptiveTerm gt Multi Surface lt osgb descriptiveTerm gt lt osgb make gt Multiple lt osgb make gt lt osg
207. ting the remainder of the field is recognisable as the original and has the same function therefore it is retained New polygon features are created to represent the new development e An agricultural field is subdivided into three approximately equal parts that continue to be in similar usage Using the guidelines above none of the fields can be considered the obvious successor to the same as the original field all have an area less than half of the original therefore three new features are created OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 22 of 142 e A house is built within a field A new feature is created to represent the house The feature representing the field is retained e A house is divided equally in two by an externally surveyable division No other changes take place The original feature is deleted and new features created This is because neither of the resultant houses is the obvious successor to the original e A large agricultural building is split into two by the addition of an externally surveyable division enclosing approximately 25 of the original area The original feature is retained to represent the larger part and a new feature is created to represent the smaller part e Most of the large garden of a residential property is sold off for development The garden feature is retained to represent the much reduced garden Joining of polygon features When two or more
208. tion of the supply not just what is contained in the supply It is intended to be used for periodic checks on data holdings maintained by a COU regime It is not intended that customers order it with every supply as processing it will slow down the translating process It can also be used to check that an initial supply of OS MasterMap data has been correctly loaded FVDS can be used with both geographic and non geographic chunk file options FVDS is itself divided into files on a non geographic basis using a 10 Mb nominal file size The FVDS is a comma separated value csv text file format that gives the TOID version number and version date of every feature that should exist in the current data holding based on the polygon extent themes polygon format and extraction date of the current order Each csv file is compressed to a gz file using the same compression algorithm as for OS MasterMap GML files GML summary file An order summary file in GML format will be supplied with all OS MasterMap vector data orders containing the order information specified by the customer This information includes e the order number e_ guery extent polygon s of the order e_ the order type Full supply or COU e for COU orders the change since date e themes requested e chunk type Non geographic or Geographic and e chunk size in Mb for non geographic chunks in km for geographic chunks Departed features As mentioned in t
209. tural landformLine Landform Ridge Or Rock Line Natural landformLine Landform Top Of Cliff Edge Limit Natural landformBoldLine Landform Bottom Of Slope Edge Limit Manmade landformLine Network Or Polygon Inferred Property Closing Closing closingLine Closing Geometry Link Network Or Polygon Polygon Closing Link Closing closingLine Closing Geometry Path Tunnel Edge Edge Limit Manmade defaultUndergroundLine Political Or District Boundary districtLine Administrative Political Or Electoral Boundary electoralLine Administrative Political Or Parliamentary Boundary parliamentaryLine Administrative Political Or County Boundary countyLine Administrative Political Or Parish Boundary parishLine Administrative Rail Narrow Gauge Network narrowGaugeRailwayAlign mentLine Rail Standard Gauge Track standardGaugeRailLine Rail Buffer Manmade defaultLine Rail Minor Detail defaultLine Rail Tunnel Edge Edge Limit defaultUndergroundLine Road Or Track Tunnel Edge Edge Limit Manmade defaultUndergroundLine Road Or Track Public Edge Limit Manmade defaultDashedLine Road Or Track Traffic Calming Edge Limit Manmade defaultDashedLine Roadside Minor Detail defaultLine Structure Minor Detail Manmade defaultLine Structure Pylon Edge Limit Manmade defaultLine Tidal Water Mean High Water Springs Edge Limit Natural waterBoldLine Tidal Water Mean Low Water Springs Edge Limit Natural waterDashedLine o I
210. uilding names Heritage and antiguities For Ordnance Survey purposes antiguities are defined as existing artificial features of a date not later than AD 1714 the date of the accession of George I together with very important sites of battlefields and natural features connected with important historic events Exceptionally features and sites of a date later than AD 1714 may be treated as antiguities if they are of national importance The investigation recording and surveying of archaeology is the responsibility of English Heritage and Royal Commissions on Ancient and Historical Monuments RCAHMs for Scotland and Wales Antiguity find sites are not shown in OS MasterMap Ordnance Survey has no responsibility for defining the authenticity of distinctive or descriptive names of antiguities Physical features shown in the heritage and antiguities theme Due to the variety of real world objects in this theme an exhaustive list is not provided but they do include e standing stones e earthworks e hill figures e ruined buildings e tombs and e stone circles Some non physical features are shown in the heritage and antiquity theme These include e textual descriptions for the real world objects and e battle sites as either text or symbol OS MasterMap Topography Layer user guide chapter 4 v1 9 12 2010 Crown copyright Page 29 of 142 There are some constraints on what can be shown imposed by survey principles Many eart
211. upplied in their entirety Inconsistent features There are occasions when data update will temporarily leave a feature in an inconsistent state This occurs when neighbouring data are updated and the edits are applied to the seamless database at different times According to the type of feature the following results may be realised Polygon boundary duplication A break in a polygon boundary on the edge of an update area will cause neighbouring features to take on identical geometric properties and the broken line work to be removed from all polygon structuring Once the update is completed the polygons will resume their respective boundaries OS MasterMap Topography Layer technical specification chapter 7 v1 9 12 2010 Crown copyright Page 91 of 142 Example a before update b during update c after update Disappearing polygon features Where a polygon boundary is broken and there is no neighbouring polygon the feature will be temporarily removed from supply A query on this area between updates will not return the broken feature A change only query will return a departed feature to indicate that this feature has been removed from supply Once the complete edit has been applied to the database the feature will be supplied with its original identity and history Broken lines A polyline that crosses an updated area boundary may occasionally be broken by a partial update Where this occurs the line is flagged as broken and t
212. uracy position of dataset agree with the coordinates of the features same point on the ground in the British National Grid reference system Relative accuracy Positional consistency of a data point or feature in relation to other local data points or features within the same or another reference dataset Geometric fidelity The trueness of features to the shapes and alignments of the objects they represent Temporal Accuracy of Temporal How well ordered events are recorded in the accuracy temporal consistency dataset life cycles ulcer and Temporal validity Validity of data with respect to time the relationships of currency amount of real world change that has been features incorporated in the dataset that is scheduled for capture under current specifications Thematic Classification of Classification How accurately the attributes within the accuracy features and their correctness dataset record the information about attribute attributes objects accuracy When testing the data according to the dataset specification against the real world or reference dataset Currently available measures for OS MasterMap Topography Layer can be found on the product page of the Ordnance Survey website OS MasterMap Topography Layer user guide chapter 9 v1 9 12 2010 Crown copyright Page 58 of 142 Annexe A Administrative boundary alignments Administrative boundaries may or may not have a predefined relationship with t
213. urism department would be able to give out the correct rate to visitors as soon as this increase was implemented This reduces the likelihood of out of date information being passed onto customers It also reduces the temptation to duplicate data across departments enabling data to be stored once but reused many times To be able to associate datasets together a customer needs to understand what the relationship is between the datasets relationships can be categorised as spatial or a spatial An example of a spatial relationship is when the customer uses the individual features to construct or derive their own geometry data An example would be a planning department wishing to record the exact extent of the area submitted in a planning application An example of an a spatial relationship is where the geometry is either always going to be the same as a single feature or at the opposite end of the spectrum the geometry is unimportant to the application within which the features are used An example would be recording buildings that have received improvement grants for energy efficiency It does not matter what shape the house is just that it has received monies for some improvements It should be noted that relationships are mainly created polygon to polygon It is possible that users may wish to associate point and line data to OS MasterMap polygons as well Tabular or text based data that has no geometry currently can also be associated by intro
214. ustomers and to provide a high level means of dividing the data on the layer coherently or logically A feature can be a member of any number of themes All features belong to at least one theme A theme is created by applying rules based on the attributes of features A theme rule can depend on the value in more than one feature attribute A feature is a member of every theme for which it passes the theme rules Themes are not part of the classification system of OS MasterMap features A new theme can be created for the convenience of users without in any way affecting either the existing themes or the classification of OS MasterMap features Features In this user guide the term real world object is used to describe a geographic entity that can be captured and represented in the data A real world object is represented by a feature in OS MasterMap data A complete list of the real world objects and their feature representations is given in the OS MasterMap Real world Object Catalogue A i OS MasterMap Topography Layer user guide chapter 1 v1 9 12 2010 Crown copyright Page 13 of 142 Each feature has one of three geometrical structures a point a line or a polygon A line feature will have a start and end node that reflects the start and end of the real world object it represents Where the start and end node is coincident the feature created is structured as a polygon Lines and polygons represent
215. ute values corresponding to each feature code The table can be found in the technical specification Other attributes These attributes are not common to all feature types Please refer to the table above to see which features have which set of attributes Make Make is also a feature description attribute but only for topographic point line and polygon features It indicates whether the feature is man made or natural if this is Known This attribute may be useful for example in applications where the porosity of land cover is important such as in calculating surface run off from rainfall Calculated area value This is the calculated area of a polygon feature in sguare metres Calculating the area of a feature or group of features is a common action within GIS By providing this as part of the attribution the product should save customers the time it would take them to calculate the areas themselves Broken Polygons may get temporarily broken due to the editing process How this happens and the implications for a customer s holding of the product are discussed in full on the Ordnance Survey website This attribute records a value of either true or false True indicates that it is broken Height above datum The simple attribute contains the height of the feature above the Ordnance Datum Newlyn vertical datum in metres The complex attribute contains the simple attribute of the same name with some additional accuracy information This
216. ve that wording from any records used to generate mail OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 19 of 142 Figure 11 using the TOID to resolve ambiguity in customer records Customers could consider grouping sets of features together into more complex features representing schools factories or individual properties comprising a house its garage and garden by storing a list of the TOIDs TOIDs enable explicit maintained references between features in different layers OS MasterMap ITN line and point features reference the OS MasterMap Topography polygon features within which they are located This allows the user to navigate between the network and polygonised view of the same road network OS MasterMap Address features reference the OS MasterMap ITN network features they are addressed from and the OS MasterMap Topography polygon feature they are located within This allows the user to navigate to premises from the road network or between the point and polygonised view of premises respectively Feature version numbers Although a feature might remain essentially the same in terms of its nature throughout its life it is likely to experience changes in terms of the information that Ordnance Survey collects and supplies in its attributes Each feature also has a version number that is incremented each time there is change of any kind to the feature via one of its attributes The c
217. verhead Normal cartographic level is that perceived to be the normal surface level Where area features overlie others for example bridges they are at normal cartographic level and the features below them are recorded as obscured Indicates the physical level of a feature with reference to the normal cartographic surface level Only four values are used 1 Underground detail 49 Obscured detail below the normal cartographic level 50 Detail at the normal cartographic level 51 Overhead detail above normal cartographic level physicalPresence String This attribute indicates the nature of the object represented by the feature This is normally used for TopographicLine for example a value of obstructing indicates that the feature prevents pedestrian access whereas a value of edge limit means that the feature represents a change of surface type and does not generally impede access This attribute is also used to identify administrative boundary and inferred line features and moveable area features for example moveable cranes See Attribute values physicalPresence OS MasterMap Topography Layer technical specification chapter 5 v1 9 12 2010 Crown copyright Page 77 of 142 Simple attribute name Type Description point Point A pair of easting and northing ordinates in metres defining a horizontal location in the British National Grid spatial reference syste
218. version 1 create new feature version 1 Figure 12 feature creation in OS MasterMap Creation of polygon features due to real world change When a new real world object with an area such as a pond a building or a land parcel comes into being a new polygon feature is created in the data with a new TOID and version number Customers with local holdings of OS MasterMap data will be informed of new features in their holding via COU Deletion of polygon features due to real world change When a real world object represented as a polygon feature no longer exists in the real world the polygon feature is deleted from the database A record is kept in the database to indicate that a feature with this TOID used to exist and when it was deleted Customers with local holdings of OS MasterMap data are informed of the deletion in their next COU OS MasterMap Topography Layer user guide chapter 3 v1 9 12 2010 Crown copyright Page 21 of 142 Modification of polygon features due to real world change When a real world object represented as a polygon feature changes but is considered to be still the same real world object the corresponding modified feature is retained in the database The version number is incremented and the date on which the new version became current is stored If however the real world object has undergone change such that it is not considered to be the same object as before the polygon feature representing it is
219. y OS MasterMap feature has a unique reference known as a TOID The TOID is a number with a prefix of osgb They are never reassigned to a different feature The TOID is allocated sequentially when a feature is created by Ordnance Survey The TOID does not contain any intelligence about the feature One of the key principles of unique referencing is that the TOID will stay the same throughout the life of a feature This gives the feature continuity within its life cycle and makes managing change in a holding of the product easier TOIDs are also used to identify one OS MasterMap feature from another This can reduce the ambiguity when sharing data A typical example of this is shown in figure 9 where a single building could be recorded in a number of different ways An organisation could have the property on the corner as 35 Onslow Road in one set of records and as 1 10 Cranbury Towers Cranbury Place in another Using OS MasterMap the organisation could perform two checks to establish identity Firstly if the TOID of the building as recorded in OS MasterMap Topography Layer osgb1000001329143866 was recorded as well the records could be matched up and the ambiguity removed Secondly by querying the OS MasterMap Address Layers the organisation could establish that only ten addresses are registered at that site 1 10 Cranbury Towers Therefore the organisation can establish that 35 Onslow Road is not a postal address and could therefore remo
220. y are 100 metres or more in length They need not be all weather All tracks are described as Track or Tk if required to be abbreviated Distinctively named tracks have their name recorded for example HICKS LANE Track Paths For Ordnance Survey purposes a path is defined as any established way other than a road or track They can be considered as either made or unmade Made paths Made paths are those whose surface is paved or metalled Only major paths are shown in parks public gardens cemeteries and so on Made paths are described by the annotation Path except in built up areas where the description will not normally be recorded or if the path has a distinctive name such as Simmons Walk Unmade paths Unmade paths are those that are neither paved nor metalled An unmade path is included in the Topography Layer when its entire length is evident on the ground and it starts at a road track or path and finishes at a similar feature or a specific place of interest Unmade paths are described by the annotation Path um in urban and rural areas The physical features shown in the roads tracks and path theme are listed below e Kerb lines or the limits of metalling representing e carriageway limits including any hard shoulder or shallow drainage gullies forming the side of the road on dual carriageways or motorways e kerbed roundabouts e traffic islands in roads except when very small traffic islands must u
221. y translating them to the location of the feature they are representing and rotating them if the orientation attribute is present by a given amount Fill symbols Fill symbols are used to represent some attribution of a polygon feature and are distributed as a pattern fill across the polygon For example the symbol may represent information about the topographic surface such as the vegetation type Because of the overheads of applying pattern fills in many current software systems it is noted that pattern fills are optional according to the user requirements and system capabilities For example if a user does not reguire each mixed vegetation type to be identified graphically it is envisaged that the multiVegetationPattern as defined in Pattern definitions may be used to represent all mixed vegetation features OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 116 of 142 Line styles Line styles are used to allow a user to distinguish between different types of linear feature for example distinctions may be made to emphasise e Obstructing detail e Water limits and linear features e Non obstructing detail e Landform detail e Underground detail e Narrow gauge railways e Overhead detail e Statutory boundaries e Building outlines e Polygon closing features Some lines particularly those representing the road network are drawn twice using first a background style and then an ov
222. ymbol 2 translate 1 75 1 Name bouldersFillSymbol Symbol 1 boulderFillSymbol Symbol 2 smallBoulderFillSymbol Name rocksFillSymbol Symbol 1 rockFillSymbol Symbol 2 smallRockFillSymbol Transformation 2 Symbol 1 translate 0 8 1 Symbol 2 translate 1 2 1 2 Name coniferousTreesFillSymbol Symbol 1 coniferousTreeFillSymbol Symbol 2 smallConiferousTreeFillSymbol Name nonconiferousTreesFillSymbol Symbol 1 nonconiferousTreeFillSymbol Symbol 2 smallNonconiferousTreeFillSymbol Name scrubFillSymbol Symbol 1 bushFillSymbol Symbol 2 smallBushFillSymbol Transformation 3 Symbol 1 translate 1 1 Symbol 2 translate 1 1 Name coniferousTreesAndScrubFillSymbol Symbol 1 coniferousTreesFillSymbol Symbol 2 scrubFillSymbol Name heathAndScrubFillSymbol Symbol 1 heathFillSymbol Symbol 2 scrubFillSymbol E OS MasterMap Topography Layer technical specification annexe C v1 9 12 2010 Crown copyright Page 130 of 142 Name heathAndScatteredRocksFillSymbol Symbol 1 heathFillSymbol v Symbol 2 smallRockFillSymbol A Name nonconiferousTreesAndConiferousTreesFillSymbol Symbol 1 nonconiferousTreesFillSymbol Symbol 2 coniferousTreesFillSymbol ii 4 Name nonconiferousTreesAndCoppiceFillSymbol Symbol 1 nonconiferousTreesFillSymbol Symbol 2 coppiceFillSymbol O Name nonconiferous TreesAndScrubFillSymbol e Symbol 1 nonconiferousTreesFillSymbol Symbol 2 scrubFillSymbol
223. yright Page 72 of 142 TopographicPoint Attribute Occurrence TOID featureCode version versionDate theme accuracyOfPosition changeHistory descriptiveGroup descriptive Term heightAboveDatum heightAboveGroundLevel make physicalLevel physicalPresence point lt a j IEN Iech OOOO M Lech 0 CartographicSymbol Attribute Occurrence TOID featureCode version versionDate theme changeHistory descriptiveGroup descriptive Term orientation physicalLevel physicalPresence point reference ToFeature Loch 1 0 lh Luch Jo och Iech lech Iech ech IEN Iech NOTE referenceToFeature is only used for culverts and in that case it is singular and mandatory OS MasterMap Topography Layer technical specification chapter 4 v1 9 12 2010 Crown copyright Page 73 of 142 CartographicText Attribute Occurrence TOID featureCode version versionDate theme anchorPoint changeHistory descriptiveGroup descriptive Term make physicalLevel A Loch IEN Lech IEN EH IECH Ich Iech Iech o physicalPresence 1 textRendering textString DepartedFeature Attribute Occurrence TOID 1 boundedBy 1 theme 1 reasonForDeparture 1 deletionDate 0 1 NOTE DepartedFeatures are only supplied in COU data

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