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1. 21 Clarification of terms used in this chapter eee 21 Sien U eT 4 21 AME a DUIO m E 21 Se e TT 21 Schema overview and 1OCATION oio tr Revo dec suba eaten sube opt eui te in soo esce d bene a i h 21 GS Tel CS SC OMS NR E T eels ciate on ode E seed 21 FOOT ee lennen th ceed E 22 Beie Eie eien c 22 Simple Features Profile Level ccccccccccseececeeeeeceeeeeeeecesseeeeeeseessaeeeseeeeseaeesseneeees 22 Chapter 2 IEE a E a MUT PH TE 23 Chapter 3 SE c n 24 Chapter 4 Data structure and attributes 1 Leeee eee LL LLeeee ee eee e iieeeee nennen ahhh nan n nnn nnnm 25 v1 0 03 2011 2o o MEE OS VectorMap District technical specification contents v1 0 03 2011 Crown copyright Page 19 of 32 Introduction Purpose of this specification and disclaimer This is the technical specification hereafter referred to as the specification applicable to the OS VectorMap District product hereafter referred to as the product 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 in or accessed through this guide or throug2. Crown copyright Page 24 of 32 Chapter 4 Data structure and attributes Shapefile Name GML Geometry Attribute4 Attribute6 FeatureType AdministrativeBoundary LINE CLASSIFICA e National e Parish Or Community e District Or London Borough e County Or Region Or Island a es Building POLYGON J jJ d d o _ElectricityTransmissionLine LINE Ff Foreshore POLYGON J J o 0000 d oo o Glasshouse POLYGON T JJ 0 j 0000000 ooo o o _HeritageSite POINT NAME Fe tand POLIGON y o 0 0 0 o0 0 0 0 0 O O NamedPlace POINT NAME HTMLNAME ORIENTATIO FONTTYPE FONTCOLOUR FONTHEIGHT 1 2 3 Woodland POLYGON JJ J J J y oO Omamnt POLYGON J L4 J o PublicAmenity POINT CLASSIFICA EducationFacility PlaceOfWorship LeisureOrSportsCentre PoliceStation B Hospital NENNEN OS VectorMap District technical specification chapter 4 v1 0 03 2011 Crown copyright Page 25 of 32 RailwayStation POINT CLASSIFICA Light Rapid Transit Station Railway Station Underground Station Railway Station And Underground Station Light Rapid Transit Station And Railway Station e Light Rapid Transit Station And Underground Station RailwayTrack LINE CLASSIFICA e Multi Track e Single Track e Narrow Gauge a RailwayTunne UNE Road LINE NAM
3. The boundary of tidal water extends to the outer tile limits of the national product set Shapefile TidalWater shp GML FeatureType TidalWater Foreshore Foreshore lies between mean high water mean high water springs Scotland or the NTL of rivers and mean low water mean low water springs Scotland Foreshore is represented as a polygon that is there is no differentiation between sand mud shingle and so on It should be noted that as the tidal water feature extends to mean high water mean high water springs Scotland or the NTL of rivers the foreshore polygon will overlap the tidal water polygon This is to assist with styling smaller scale output where the inter tidal information may not be required Shapefile Foreshore shp GML FeatureType Foreshore Land All areas above mean high water mean high water springs Scotland or the NTL of rivers are defined as land and represented by a polygon Shapefile Land shp GML FeatureType Land Administrative boundaries The approximate alignments of the following administrative boundaries are contained within the product These features are represented as lines The attribute classification defines the type of boundary e National Boundary e District Or London Borough e County Or Region Or Island e Parish Or Community Shapefile AdministrativeBoundary shp GML FeatureType AdministrativeBoundary Differences between vector and raster formats e I
4. geometric figure that is not dependent on position such as connectivity and the relationship between lines nodes and polygons update The process of adding to and revising existing digital map data to take account of change vector A straight line joining two data points vector data Positional data in the form of coordinates of the ends of line segments points text positions and so on W3C World Wide Web Consortium W3C develops interoperable technologies specifications guidelines software and tools to lead the Web to its full potential W3C is a forum for information commerce communication and collective understanding XML Extensible Mark up Language provides a flexible way to create common information formats and shares both the format and the data on the Internet Intranets and elsewhere XML is extensible because unlike HTML the mark up tags are unlimited and self defining XML is a simpler and easier to use subset of the Standard Generalised Mark up Language SGML the standard for how to create a document structure XML schema XML schemas express shared vocabularies they provide a means for defining the structure content and semantics of XML documents O SSCSC CSCSCi s OS VectorMap District technical specification annexe A v1 0 03 2011 Crown copyright Page 32 of 32
5. in The Controller of Her Majesty s Stationery Office who has delegated powers to the Director General Ordnance Survey for the administration of copyright in publications and data including the determination of terms and conditions under which permission for their reproduction is given currency An expression of how up to date data is NE s amaUS o i aA OEEEEEILLLEIGIILLLLLLILIILLLEL ULUD LLUUUIiLLDL AACHpDTSLAGG OS VectorMap District technical specification annexe A v1 0 03 2011 Crown copyright Page 28 of 32 data A representation of facts concepts or instructions in a formalised manner suitable for communication interpretation or processing data format A specification that defines the order in which data is stored or a description of the way data is held in a file or record data model An abstraction of the real world that incorporates only those properties thought to be relevant to the application or applications at hand The data model would normally define specific groups of entities and their attributes and the relationship between these entities A data model is independent of a computer system and its associated data structures A map is one example of an analogue data model dataset An Ordnance Survey term for a named collection of logically related features arranged in a prescribed manner for example all water features A dataset has more internal structure than a layer and is related to another dataset only by p
6. 1 m but the accuracy may be 5 m or worse rural survey sweep The process by which revision is collected using aerial photography the resulting sweep is driven by change intelligence 2 MENEENENENENENENENENENENENEMEMEMEMMNMHEAAIEREEEAKERRB7 EMENEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEENI OS VectorMap District technical specification annexe A v1 0 03 2011 Crown copyright Page 31 of 32 Scalable Vector Graphics SVG SVG is a language for describing two dimensional graphics and graphical applications in XML source scale The scale of the source information from which the map was digitised that is the scale of survey for a basic scale map or the scale of the source map for a derived map spaghetti data Data that does not carry any explicit topological relationship information spot height The geographic position of ground surveyed spot heights are represented by Spot height position text feature A free standing text string in the digital data describing a feature or particular instance of a feature for example Factory or Acacia Avenue text height The height at which a text string is intended to be plotted out at the nominal map scale This information is included in the feature header of the text feature tile Broadly synonymous with digital map file it implies evenly sized map sheet units topology The study of the properties of a
7. 11 Crown copyright Page 9 of 32 Buildings Buildings are any roofed structure greater than 175 square metres and are represented as a generalised polygon Shapefile Building shp GML FeatureType Building Glasshouses greater than 5 000 square metres are represented as polygons Shapefile Glasshouse shp GML FeatureType Glasshouse Roads Road alignments these approximate to the road centre lines Certain types of road have a road name and or a road number held as attributes of the road alignment Where a road alignment passes under another road or railway then the alignment is trimmed back either side of the bridge These features are represented as lines Road alignments will have one of the following classifications each of which can be separately identified by the Classification attribute see chapter 4 in the technical specification e Motorway e Primary Road e A Road e B Road e Minor Road e Pedestrianised Street e Local Street e Private Road Publicly Accessible Shapefile Road shp GML FeatureType Road Road tunnels these are represented as approximate centrelines of the road that runs through the tunnel Shapefile RoadTunnel shp GML FeatureType RoadTunnel Differences between vector and raster formats e Road casings appear as a line style in the raster product only e Only a selection of road names and numbers are shown in the raster product where space per
8. 13 Wels eR t 13 Spot height 14 wieNee o ner 14 Depiction of complex polygons sse ee eee eee 14 EGS UO LNG MTC 14 Coordinate referencing System see eee eee eee 14 British National Grid BNG eesssssesssssesseeeeene nnne nene nnne nnns nnns 14 2o o WEN sss E X xaxa EN OS VectorMap District user guide contents v1 0 03 2011 Crown copyright Page 2 of 32 Chapter 3 Chapter 4 Annexe A Annexe B RST UMW RITTER E AA E N AE E E E E E E E E E ES 14 Pl e e IEE e EM E m E S 15 OS VectorMap District style definition nnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn nnna 16 KOSG ADIE VI O PTT EAEE EEA EE DOE 17 Product and service performance report form nnmnnn erre 18 v1 0 03 2011 OS VectorMap District user guide contents v1 0 03 2011 Crown copyright Page 3 of 32 Preface This user guide hereafter referred to as the guide is designed to provide an overview of OS VectorMap District 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 i
9. E DFTNUMBER CLASSIFICA Motorway A Road B Road Minor Road Pedestrianised Street Local Street Primary Road Private Road Publicly Accessible MotorwayJunction RoadTunnel uw SpotHeight SufaceWater Area POLYGON SSS SurfaceWater_Line LINE SSS TidalBoundary LINE CLASSIFICA e High Water Mark e pL Water Mark TidalWater POLYGON OS VectorMap District technical specification chapter 4 v1 0 03 2011 Crown copyright Page 26 of 32 Rae T LS EN Used to identify different types of otring the table above GML classification feature within a particular class FONTCOLOUR Indication of possible style colour Integer 1 Black GML fontColour 2 Blue 3 Green 4 Dark Blue FONTHEIGHT Height of text in point sizes these Integer 0 1400 GML fontHeight values are best used as indicative relative height FONTTYPE Indication of possible font style 1 Integer 1 Corbel GML fontType 2 Corbel Bold 3 Arial HEIGHT Ground height of heighted point in 123 Integer 0 3500 GML height metres NAME Name of the road station airport Romsey Road Liverpool John otring GML name heritage site ground height value Lennon Airport Croydon cartographic text and so on DFTNUMBER DFT road number otring GML dftNumber JUNCTIONNU Motorway junction number otring GML junctionNumber ORIENTATIO Orientation of the text feature in 24 Integer 0 359 GML orientation degrees HTMLNAME This attr
10. L FeatureType Airport The airport name is held in the NAME attribute Public amenities A selection of public amenities are represented as points with the attribute classification defining the available classes e Education Facility e Police Station e Hospital e Leisure Or Sports Centre e Place of Worship These features do not have their names in the data In some cases in particular schools there will have been some aggregation carried out with a single feature representing a number of instances that are in close proximity O CSSCSC CSCs OS VectorMap District user guide chapter 2 v1 0 03 2011 Crown copyright Page 12 of 32 Shapefile PublicAmenity shp GML FeatureType PublicAmenity Differences between vector and raster formats e Public amenities are not present in the raster product Heritage site A selection of heritage sites are represented as points and includes World Heritage sites and sites managed by English Heritage Cadw and Historic Scotland Every site has its name held in the attribute name Shapefile HeritageSite shp GML FeatureType HeritageSite Woodland Areas of trees are represented as polygons Small areas of woodland are omitted and small clearings in woodland are filled Shapefile Ornament shp GML FeatureType Ornament Ornament Ornament features are facsimiles of ornament artwork represented as a polygon that were previously drawn
11. V TOTO een ee ee eee ee ee eee nee en ee eee ee nee eee eee eee 8 JU ere i E EO MEME eee neon ee eg en en 8 Coverage and file sizes eee 8 Chapter 2 OS VectorMap District explained uoi aasksisax ampi ia dad ipu Y KR RR AER 9 eoe M RHET 9 6 99 8 2 c ic NNNM 9 COON Te SONU I MEER m 9 RSS VIS NS OI RR RR ROL 9 Features represented in the Product cccccccccsccceececeeeceeceseeceeceeeceeesueesaeeseeeeseueessunenaaes 9 suelo oes 10 iio S 10 Motorway UNCUONS E ade een 10 SEER Us A E NA E E A m 10 Rec ke eVi o acer E see E E E E E E tea A 11 UAE WU MUON E A E EEEN E A E EE A EAE E E A E EAA 11 POL S NOTO a ee crass cee E tei esos aces EEEE EE EEE neue 11 Ee ce A T EN A E 11 Administrative boundaries sss sese eee eee 11 acd c 12 mS sd MUTET 12 RAWY Te ERR ETE e E 12 PATE OUR CRT den ooees 12 PUG UNAS MNES aries daca hee timendo ite ofer tore ii irai timen ids sent update EE 12 Portage SIS T MTET 13 Woodland Met T C 13 Sdn ioe 13 Electricity transmission line osseessssesseeseseeeeneeenn enne
12. acter A distinctive mark an inscribed letter one of a set of writing symbols character string A one dimensional array of characters held either in memory or in another storage medium coding Allocation of a feature code to a feature being created from constituent construction data points and or segments with optional linking to an existing feature of the same feature code compact disc read only memory CD ROM A data storage medium A 12 cm disc similar to an audio CD Ordnance Survey uses the writable CD a WORM write once read many device The digital bits are encoded into a vegetable dye and once written cannot be erased by overwriting with subsequent data A laser reads the disc coordinates Pairs of numbers expressing horizontal distances along original axis Alternatively that triplet of numbers measuring horizontal and vertical distances Row and column numbers of pixels from raw imagery are not considered coordinates for the purpose of the standard copyright Copyright is a legal property right that enables the creator of an original work to protect it from unauthorised use Through the Copyright Designs and Patents Act 1988 Crown copyright continues to subsist in all Ordnance Survey products until the end of the period of 50 years from the end of the year in which they were published and in the case of data from the end of the year in which it was extracted from the Ordnance Survey database Crown copyright is vested
13. but are too important to a particular landscape to be omitted are enlarged For example rural buildings are often enlarged to a minimum size rather than being omitted e Aggregation aggregation is the combining of a number of small features to make a larger one such as buildings e Symbolisation features that are shown in detail in OS VectorMap Local may be shown by standard symbolisation in OS VectorMap District For example railway stations are depicted as point symbols e Displacement the movement of the representation of a feature away from its ground position in order to maintain its prominence There is very little displacement in OS VectorMap District but in certain circumstances some features may be moved away from adjacent detail if their representation would otherwise be lost for example some buildings are moved away from road edges to ensure they remain prominent Features represented in the product The following is a description of the features that are available in the product A full list of feature classes and their associated attributes is given in chapter 4 in the technical specification Not all features available in the product are included in the raster format For a full list of features and their styling in the raster format please refer to the legend in chapter 2 of the technical specification 2o o AEN OS VectorMap District user guide chapter 2 v1 0 03 20
14. ctorMap District GML sample data will require specialist software for data translation and manipulation Supply format OS VectorMap District is available as e Vector ESRI Shapefile with each tile dataset zipped using gzip e Raster TIFF and compressed using LZW Lemple Ziv Welch compression e Sample data GML v3 2 1 and schema zipped as a single file using gzip Supply media OS VectorMap District can be ordered from the Ordnance Survey OS OpenData website This allows you to order your area of choice and format Data is available on DVD or as a download from http www ordnancesurvey co uk oswebsite products vectormap district index html Coverage and file sizes e Shapetfile e 55 tiles each covering 100 km x 100 km comprise the national set e Each tile comprises a set of up to 23 Shapefiles e Each Shapefile holds a single feature type e Features within each Shapefile are cut into a 10 km x 10 km grid Features that cross the grid line are split e Tile sizes range from 1 Mb to 630 Mb e he data is not encrypted e TIFF e 2860 tiles each covering 10 km x 10 km comprise the national set e Tiles range from 2 Mb to 4 5 Mb e GML sample data e Asingle tile SU31 covering an area of 10 km by 10 km 2o o WEE OS VectorMap District user guide chapter 1 v1 0 03 2011 Crown copyright Page 8 of 32 Chapter 2 OS VectorMap District explained Currency OS VectorMap Di
15. d an appropriate level of content that gives an uncluttered appearance Subscribers to the OS OpenSpace application programming interface API can build location based services using the map to guide smartphone users and provide location specific information Display your business location Do you want to tell your customers how to get to your business The district view of OS VectorMap District is ideal for creating a map of a suburban area or part of a city complete with locality names for context Your customers can then zoom in to your business at a street level using the OS VectorMap Local product OS VectorMap District topographic features are representations of real world objects including buildings roads railways and rivers The data also includes non topographic features such as administrative and electoral boundaries Shapefile format only cartographic text and symbols What you need to use OS VectorMap District Computer software OS VectorMap District vector data is supplied in Shapefile format and will require specialist software for data translation and manipulation OS VectorMap District user guide chapter 1 v1 0 03 2011 Crown copyright Page 7 of 32 OS VectorMap District raster data is supplied in TIFF and can be viewed using imaging software Provision of TIFF Worldfiles in TFW and TAB formats means that the raster data can be geo referenced but this will require a geographical information system GIS OS Ve
16. erms of the OS OpenData Licence but must acknowledge the source of the data by including the following attribution statement Contains Ordnance Survey data Crown copyright and database right 201 1 Trademarks Ordnance Survey the OS Symbol OS VectorMap OS OpenSpace and OSGB36 are registered trademarks and OS OpenData is a trademark of Ordnance Survey the national mapping agency of Great Britain English Heritage is a registered trademark of Historic Buildings And Monuments Commission For England ESRI is a registered trademark of Environmental Systems Research Institute Inc OGC is a registered trademark of Open Geospatial Consortium Inc Unisys is a registered trademark of Unisys Corporation W3C is a registered trademark of Massachusetts Institute of Technology Adobe and Reader are registered trademarks of Adobe Systems Inc Backup provision of the product You are advised to copy the supplied data to a backup medium Using this guide The documentation is supplied in portable document format PDF only Free Adobe 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 docume
17. es have the same unique coordinates and attribution There are no features outside the tile edges Coordinate referencing system The vector product formats provide for the use of a variety of coordinate reference systems At present only the British National Grid BNG is used in OS VectorMap District 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 Height datum The BNG is a horizontal spatial reference system only it does not include a vertical height reference system In OS VectorMap District heights are given by the height attribute in the SpotHeight feature The geometric attributes therefore contain horizontal geometry only Several orthometric height datums are used by Ordnance Survey to define vertical spatial reference systems The most common of these is Ordnance Datum Newlyn ODN which is used throughout mainland Britain The height information in OS VectorMap District features does not specify which vertical reference system is used DENMSUUO TUE LLL un d OS VectorMap District user guide chapter 2 v1 0 03 2011 Crown copyright Page 14 of 32 Chapter 3 The National Grid Ordnance Survey divides Great Britain into squares 100 km by 100 km Each of these squares has a unique two
18. esulting in a more attractive map that complements the more detailed street level OS VectorMap Local product The product is available in three formats e as a tiled national vector dataset in ESRI Shapefile format e asatiled national raster dataset in TIFF Tagged Image File Format and e asample area of vector data in Geography Markup Language GML for evaluation The product can be used as mapping in its own right or can be used to provide a flexible geographic context reference for customers overlay information The nominal viewing scale is 1 25 000 with a recommended viewing scale range of 1 15 000 to 1 30 000 Shapefile The vectors demonstrate the versatility of the dataset to be styled in the appropriate way to support a multitude of different geographic purposes The main characteristics of the vector dataset e Data is represented by points lines polygons and attributes e No persistent feature identifiers e No feature change history e No explicit topology e Tiles are complete in themselves and all polygons that cross tile borders are closed along the tile edges TIFF The main characteristics of the raster dataset e Can be viewed using typical desktop software e Supplied in a predefined graphical style see legend e Can be viewed by most image reading software packages e World files are available enabling the raster tiles to be georeferenced O EM X aM Mu CEN OS VectorMap District user guide c
19. geometric properties are encoded according to the Simple Features Profile as referenced above The XML attribute srsName shall be set to osgb BNG BNG stands for British National Grid which uses eastings and northings specified in metres All exterior polygon boundaries have an anticlockwise orientation and all interior polygon boundaries have a clockwise orientation DM ZEE o iii SCSCSC CSCis s OS VectorMap District technical specification chapter 1 v1 0 03 2011 Crown copyright Page 22 of 32 Chapter 2 Legend Ordnance Survey OS VectorMap District Raster version Crown copyright 2011 COMMUNICATIONS TRANSPORT Depicted roads are not necessarily rights of way eooo Motorway A Junction number v an M Barnet Bypass s Primary road Main road A road B100 Chiswell Street Secondary road B road Bruton Street Minor road Local street Pedestrianised street Birmingham Multiple track railway New Street Wootton Single track railway Heron Quay lt Narrow gauge railway or light rapid transit system Oxford Circus Underground station Road or rail tunnel SS London Gatwick Airport oen SETTLEMENT Building s Glasshouse Electricity transmission line 2o o WEE OS VectorMap District technical specification chapter 2 v1 0 03 2011 Crown copyright Page 23 of 32 NATURAL FEATURES Foresho
20. h links to and from the relevant parts of the user guide Use of examples Any examples in this chapter that mention specific data content are to be taken as examples only Clarification of terms used in this chapter Feature attribute A property of a feature implemented as an XML element as defined in ISO 19109 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 Schema overview and location XML schemas are used to define and validate the format and content of the GML The GML v3 1 1 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 which are referenced by the data are available in the product release These schemas make use of XSDs XML schema definitions and DTDs document type definitions produced by the W3C which are available from the W3C website at http www w3 org XML 1998 namespace html 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 prope
21. h the Ordnance Survey website Copyright in this specification This guide is O Crown copyright 2011 You may copy or distribute any part of this guide to support the use of OS OpenData including for your personal use use in your organisation or business or for use with or incorporation in your product or application Data copyright and other intellectual property rights The Crown or where applicable Ordnance Survey s suppliers owns the intellectual property rights in the data contained in this product You are free to use the product on the terms of the OS OpenData Licence but must acknowledge the source of the data by including the following attribution statement Contains Ordnance Survey data Crown copyright and database right 201 1 2o o o WEE OS VectorMap District technical specification introduction v1 0 03 2011 Crown copyright Page 20 of 32 Chapter 1 OS VectorMap District in GML This chapter describes the GML format for OS VectorMap District It is recommended that you read this in conjunction with the Open Geospatial Consortium OGC document Geography Markup Language v3 1 1 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 Annexe B is a glossary wit
22. hapter 1 v1 0 03 2011 Crown copyright Page 6 of 32 GML sample tile Conforms to Open Geospatial Consortium OGC standards Demonstrates data in GML v3 format GML schema supplied with the tile Opportunity to provide feedback on GML structure Differences between OS VectorMap District alpha and OS VectorMap District beta Sea land and inter tidal area features added Simplified tidal boundaries Shapefile structure changes Fewer file sets for the vector format Improved text positioning Improved currency Raster style improved more suitable styling for use as a backdrop map More detailed building polygons GML sample data available in GML v3 Applications of OS VectorMap District The purpose of OS VectorMap District data is to support a wide range of customer applications that utilise geographic information These may include Backdrop mapping on your website For your area you may wish to take advantage of free data on the Government s data gov uk website for example air pollution data The layered structure of OS VectorMap District enables you to display the map to show only the features you want to show for example roads place names and buildings You may want to style the data as a faded map backdrop to ensure your own or third party overlaid data are clearly portrayed Develop an interactive web application OS VectorMap District has been designed for on screen use with generalised detail an
23. ibute contains all names Abhainn Leosaid otring GML not present including all accents Those T lt f gt amp x0177 lt f gt Ruttan accented letters that do not have an ASCII value have HTML control characters OS VectorMap District technical specification chapter 4 v1 0 03 2011 Crown copyright Page 27 of 32 Annexe A Glossary accuracy The closeness of the results of observations computations or estimates to the true values or the values accepted as being true Accuracy relates to the exactness of the result and is the exactness of the operation by which the result is obtained administrative area A term used by Ordnance Survey to refer to all public administrative areas specifically local government management and electoral areas air height This is height derived from aerial photography area A spatial extent defined by circumscribing lines that form a closed perimeter that does not intersect itself attribute An attribute is a property of an entity usually used to refer to a non spatial qualification of a spatially referenced entity for example a descriptive code indicating what an entity represents or how it should be portrayed attribute value A specific quality or quantity assigned to an attribute cartography The organisation and communication of geographically related information in either graphic or digital form It can include all stages from data acquisition to presentation and use char
24. ight Page 13 of 32 e Font Colour this can be used to select different classes of text e Names associated with inland water Value 2 e Names associated with tidal water Value 4 e Names associated with woodland Value 3 e All other names Value 1 Shapefile NamedPlace shp GML FeatureType NamedPlace Differences between vector and raster formats e Inthe raster product the text will follow complex curves such as rivers Spot height Height is represented as a point The height of the spot height above datum is held in the height attribute A maximum of two spot heights are shown in every 1 km by 1 km grid square representing the highest and lowest values available Shapefile SpotHeight shp GML FeatureType SpotHeight Simple polygons Simple polygons are depicted in the vector format as outer polygons with coordinates in a clockwise order Depiction of complex polygons For complex polygons that is polygons containing holes the holes are depicted as inner polygons with coordinates in an anticlockwise order within outer polygons with coordinates in a clockwise order Edgematching Tiles are complete in themselves that is all polygons that cross tile borders are closed along the tile edges However some text features in the vector format are split across tile edges Where a feature ends by intersecting a 10 km tile edge it is matched with its corresponding feature on the adjacent tile so that both featur
25. ints are represented by nodes which may be isolated or part of a link terminating Points may also be represented by symbols that may have attributes such as rotation and size polygon Polygons are a representation of areas A polygon is defined as a closed line or perimeter completely enclosing a contiguous space and made up of one or more links At least one node occurs on the perimeter of a polygon where the bounding link completes the enclosure of the area There may be many nodes connecting the bounding links of a polygon Links may be shared between polygons Polygons may wholly contain other polygons or be contained within other polygons Each may contain a single isolated node seed point that identifies the polygon polygon boundary The link or links that enclose a polygon projected into the horizontal plane positional accuracy The degree to which the coordinates define a point s true position in the world directly related to the spheroid projection on which the coordinate system is based precision The exactness with which a value is expressed whether the value be right or wrong road casings These are parallel lines that define roads alignments in the data resolution A measure of the ability to detect quantities High resolution implies a high degree of discrimination but has no implication as to accuracy For example in a collection of data in which the coordinates are rounded to the nearest metre resolution will be
26. letter reference for example TG in the diagram below OS VectorMap District vector format tiles are identified by quoting the National Grid reference of the south west corner of the 100 km area they cover for example TG To describe an OS VectorMap HP District raster format tile which covers 10 km by 10 km first add a two digit reference to the HT fu 100 km by 100 km square reference with the easting first HW HX Hy HZ followed by the northing for example TG23 For additional N information on how to use the D National Grid visit the Ordnance Survey website at http www ordnancesurvey co uk E S NT NU NW NK NY NZ SC 80 SE m 8H s SJ SK TF TG su s SP TL IM boia 9 SR SS ST SU TQ TR a SV SW SX SY SZ TV 100 km by 100 km square TG 10 km by 10 km square TG23 2o MENENENENENENENENENENEMEMEMZM SSCSC SC OS VectorMap District user guide chapter 3 v1 0 03 2011 Crown copyright Page 15 of 32 Chapter 4 OS VectorMap District style definition It is the flexibility to select and style the different feature classes in different ways that makes the vector format of OS VectorMap District such a versatile contextual mapping product It can be styled in an almost infinite variety of ways to best provide a geographic context to the customer s overlay information The raster version is ready styled and this style is fixed within the limitati
27. mits Motorway junctions These features are represented as points with the junction number held in the junctionNumber attribute Shapefile RoadJunction shp GML FeatureType RoadJunction Surface water Rivers and streams narrower than 5 m are represented as a single line Lakes ponds and rivers or streams wider than 5 m are represented as polygons with their perimeters held as lines Water features are broken under bridges or other detail Shapefiles SurfaceWater Line shp SurfaceWater Area shp GML FeatureTypes SurfaceWater Line SurfaceWater Area 2o 9 MEE OS VectorMap District user guide chapter 2 v1 0 03 2011 Crown copyright Page 10 of 32 Tidal boundary Mean high water mean high water springs Scotland and mean low water mean low water springs Scotland are defined as lines and differentiated by the attribute classification The tidal limits are shown for their full extents including from the mouths of rivers to the normal tidal limit NTL There is no specific feature defining NTL For the most part these lines are continuous but may be broken where they are obscured by other features such as road bridges Shapefile TidalBoundary shp GML FeatureType TidalBoundary Tidal water The areas of tidal water defined as the area of water below mean high water mean high water springs Scotland or the NTL of rivers are represented as polygons
28. n 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 B and return it to us Contact details Our Customer Service Centre will be pleased to deal with your enquiries Customer Service Centre Adanac Drive Romsey Road SOUTHAMPTON S016 OAS 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 product is made available to you and your organisation on the terms of the OS OpenData Licence at www ordnancesurvey co uk opendata licence If there is any inconsistency between the terms of the licence and this guide the terms of the licence prevail Purpose and disclaimer This guide is provided for guidance only and does not constitute any warranty representation undertaking commitment
29. ne segments Lines may be concurrent with other lines under certain conditions As an object abstraction a line has no width linear feature Map feature in the form of a line for example road centre lines that may or may not represent a real world feature map The representation on a flat surface of all or part of the Earth s surface intended to be communicated for a purpose or purposes transforming relevant geographic data into an end product that is visual digital or tactile map generalisation A reduction in map detail so that the information remains clear and uncluttered when map scale is reduced May also involve re sampling to larger spacing and or a reduction in the number of points in a line map scale The ratio between the extent of a feature on the map and its extent on the ground normally expressed as a representative fraction for example 1 2500 or 1 50 000 megabyte MB 1 048 576 bytes a measure of data storage capacity name or text feature The proper name or label of an object real world or feature object abstraction consisting of one or more text strings A name position is defined by a coordinate pair National Grid A unique referencing system that can be applied to all Ordnance Survey maps of Great Britain at all scales It is based on 100 km squares covering the whole of GB based on a Transverse Mercator projection It is used by Ordnance Survey on all post war mapping to provide an unambiguous spatial refe
30. nt 2o o e MEE OS VectorMap District user guide preface v1 0 03 2011 Crown copyright Page 5 of 32 Chapter 1 A Introduction to OS VectorMap District beta Using the user guide This user guide contains basic information you will need to understand use and manage OS VectorMap District beta The OS VectorMap District technical specification contains detailed technical information and data format specification Annexe A in the user guide provides a list of road abbreviations Annexe B in the user guide is a product and service performance report form for you to submit any comments on OS VectorMap District Annexe A in the technical specification is a glossary of terms you will find throughout this user guide OS VectorMap District overview Introduction OS VectorMap District is a mapping dataset designed for providing contextual mapping output on paper PCs hand held devices or the Internet The vector format of the product consists of layers to enable you to customise and style output to suit your needs OS VectorMap District was released as an alpha version in April 2010 as part of the OS OpenData suite of products The alpha version was put together using technology and processes that were in development at that time these have been significantly developed to build the beta release made available from March 2011 This beta release offers significantly improved generalisation r
31. nthe raster product only the national boundaries are depicted 2o o WEE OS VectorMap District user guide chapter 2 v1 0 03 2011 Crown copyright Page 11 of 32 Railways All railways are represented as lines and are broken where they pass under bridges buildings or other obstructing detail The attribute classification defines the type of railway e Multi Track e Single Track e Narrow Gauge Shapefile RailwayTrack shp GML FeatureType RailwayTrack Railway tunnels All railway tunnel alignments are represented as a single line Shapefile RailwayTunnel shp GML FeatureType RailwayTunnel Railway stations Railway stations are represented as points The attribute classification defines the type of station e Light Rapid Transit Station e Railway Station e Underground Station e Railway Station And Underground Station e Railway Station And Light Rapid Transit Station e Light Rapid Transit Station And Underground Station The name of the station is held in the attribute name The position of the railway station will be close to a railway alignment but will not necessarily be coincident with it Shapefile RailwayStation shp GML FeatureType RailwayStation Airport A selection of airports are represented as points with a name held in the name attribute Shapefile Airport shp GM
32. oS gue OS VectorMap District User guide and technical specification OS VectorMap District User guide Contents section Page no zit ANN mc d RS RT 4 Brees me eleis e RENTRER enn eee nee ee ee ee ee ee eee 4 Purpose and disclaimer eee eee ee 4 c e sle daii 15T T m 4 Data copyright and other intellectual property rights sese ee eee 5 Gs T ANI cR HR 5 Backup provision of the PrOduct cccccceccccseeccceeececeeeeseeeeeceeeeeseeeesseeeesseeeesseeesaeeesaeeeseeeessaes 5 Jsing MiS GUJE mr M 5 Chapter 1 Introduction to OS VectorMap District beta cccccessssssssseeeeeeeeeeeensneseeeeeeeeeesneeeesseoes 6 Gong lS SOR UNG Cesc EU UU I MT 6 OS VectorMab DISC OVERVICW scc ieco som Oe xp Vest rus edet aee De atus sube Vect sui i a a ee ean iea 6 IIT EN SON e 6 vircs 6 PEP aes 6 GNE SINDE U T 7 Differences between OS VectorMap District aloha and OS VectorMap District beta 7 Applications of OS VectorMap DISC ee eee ee 7 What you need to use OS VectorMap District ccc ee 7 Computer Sols cd ene ere ee ee me eee en ee eee eee eee eee ene ere 7 SUDDI
33. on paper maps to depict coastal rocks outcropping rocks screes and so on They were drawn from aerial photography and give a good and accurate definition of rock strata Shapefile Ornament shp GML FeatureType Ornament Electricity transmission line Electricity transmission line alignments are represented as lines A single line is used to show the alignment of multiple power lines between towers The electricity transmission towers are not depicted Shapefile ElectricityTransmissionLine shp GML FeatureType ElectricityTransmissionLine Named places Named places such as settlements hills valleys and sea areas are represented by a cartographically positioned point Each feature has a number of attributes e Name the character string of the name in extended ASCII which includes accented characters with the exception of y and W e HTML Name is used for those names that contain y or w where the accents are defined using standard HTML control characters e Font Height the suggested height of the font in points e Font Type the suggested font The values are e 1 Corbel e 2 lt Corbel Bold e 3 Arial e Orientation the orientation of the text string in degrees clockwise from horizontal It is held as a number between 0 and 359 to the nearest degree 2o o o WENN sssssescdc7gs cqQ Md ggg xs ass OS VectorMap District user guide chapter 2 v1 0 03 2011 Crown copyr
34. ons of the image viewing software Below is an example of the raster style The full graphic legend is at chapter 2 in the technical specification Three Northgate Bridges Jubilee Field Furnace Green O SSC CSCis OS VectorMap District user guide chapter 4 v1 0 03 2011 Crown copyright Page 16 of 32 Annexe A Road abbreviations This annexe gives the approved shortened and special abbreviations for use with road names both urban and rural It contains a list of items that are most likely to occur as the descriptive element within road names Combinations can be used for example SHIRLEY RD S SHIRLEY ROAD SOUTH OR N RD ROWNHAMS NORTH ROAD ROWNHAMS Three priorities of shortened abbreviations are shown however every effort is made to incorporate the full name if possible Shortened abbreviations Shortened abbreviations in priority of use in priority of use ALLEY AL APPROACH APP ARCADE ARC AVENUE AVE BOULEVARD BVD BROADWAY BDY BROW BR BUILDINGS BLDGS BY PASS BY PS CAUSEWAY CSWY CENTRE CHASE OS VectorMap District user guide annexe A v1 0 03 2011 Crown copyright Page 17 of 32 Annexe B Product and service performance report form Ordnance Survey welcomes feedback from its customers about OS VectorMap District If you would like to share your thoughts with us please print a copy of this form and when comple
35. or obligation express or implied about the product or its suitability for any particular purpose 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 Ordnance Surveyss liability to you in relation to the product is limited as set out in the OS OpenData Licence 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 in or accessed through this guide or through the Ordnance Survey website Copyright in this guide This guide is O Crown copyright 2011 You may copy or distribute any part of this guide to support the use of OS OpenData including for your personal use use in your organisation or business or for use with or incorporation in your product or application 2o o Ma OS VectorMap District user guide preface v1 0 03 2011 Crown copyright Page 4 of 32 Data copyright and other intellectual property rights The Crown or where applicable Ordnance Survey s suppliers owns the intellectual property rights in the data contained in this product You are free to use the product on the t
36. osition distinctive name A text feature consisting of text string s that form s a proper name edgematch The process of ensuring that data along the adjacent edges of map sheets or some other unit of storage matches in both positional and attributes terms encryption Using a set of either public or public private keys to encrypt and decrypt data it ensures that information is unreadable by anyone other than the intended recipient feature An item of detail within a map that can be a point or symbol a line or text feature class A specific named record that lists the feature codes in use in the current database feature code FC An alphanumeric attribute code used in digital map data to describe each feature in terms of the object surveyed its representation on the map or both feature description A numeric attribute has a textual description that describes the feature in terms either of the object surveyed or its representation on the map or both font The style of text character used by a printer or plotter format The specified arrangement of data for example the layout of a printed document the arrangement of the parts of a computer instruction or the arrangement of data in a record geographical information system GIS A system for capturing storing checking integrating analysing and displaying data that is spatially referenced to the Earth This is normally considered to involve a spatially referenced com
37. puter database and appropriate applications software GML Geography Mark up Language An XML encoding for the transport and storage of geographic information including both the geometry and attributes of geographic features ME azAX 36 LL CtsSCSC C SSCSCi sd OS VectorMap District technical specification annexe A v1 0 03 2011 Crown copyright Page 29 of 32 Gzip Gzip produces files with a gz extension gunzip can decompress files created by gzip compress or pack The detection of the input format is automatic height datum Datum is a known position from which all height information is relatively measured The heights expressed for points mapped on the National Grid are expressed as a height difference in meters from a known point on the harbour wall in Newlyn Cornwall history In the context of geospatial data the storage of deleted features and superseded versions of features This does not apply to OS VectorMap District vectors grid The planimetric frame of reference for example the National Grid kilobyte KB 1 024 bytes a measure of data storage capacity line A series of connected coordinated points forming a simple feature with homogeneous attribution line feature The spatial abstraction of an object in one dimension Lines may intersect with other lines They are defined as a series of two or more coordinates and may be curved or straight Curved lines consist of a series of very short straight li
38. re Land Omament Water surface or tidal Woodland Water Mean high water Mean low water HERITAGE 1X Heritage site HEIGHT Surface heights are in metres above mean sea level 4i Height ADMINISTRATIVE BOUNDARIES at ee eens Sees Teer at eae c ol National Chapter 3 Data model class Product Physical Model OSVectorMapbDistrict Shape esriFieldTypeGeometry Object ESRI Classes Feature NamedPlace S E FONTTYPE esriFieldTypeSmalllnteger Motorw ayJunction ID esriFieldTypeSmalllnteger NAME esriFieldTypeString y FONTCOLOUR esriFieldTypeSmalllnteger RailwayTrack SpotHeight ENDE esiFieldTypeStiing JUNCTIONNUMBER esiFieldTypeSmallInteger ee omFieldTypeDouble CLASSIFICATION estiFieldTypeString HEIGHT estiFieldTypeSmallinteger NAME esriFieldTypeString HTMLNAME esriFieldTypeString CLASSIFICATION esrFieldTypeString TidalBoundary RailwayTunnel TidalWater Woodland RoadTunnel Building NAME esiFieldTypeString Omamet AdministrativeBoundary PublicAmenity SurfaceWater_Line RailwayStation D CLASSIFICATION esiFieldTypeString CLASSIFICATION esriFieldTypeString NAME esiFieldTypeString CLASSIFICATION esriFieldTypeString HeritageSite SurfaceWater Area ElectricityTransmissionLine NAME esiFieldTypeString Em N En m Figure 1 ESRI Shapefile physical model OS VectorMap District technical specification chapter 3 v1 0 03 2011
39. rence in Great Britain for any place or entity whatever the map scale Normal tidal limit NTL The point inland to which mean tides or mean spring tides in Scotland flow at high water The point is shown and annotated by text sS S LL aU hh EEEELLLLILILLLIIIIIIIILLLLULLLILLELEbPeAAALI b DOAAAALLAAA GCG OS VectorMap District technical specification annexe A v1 0 03 2011 Crown copyright Page 30 of 32 OGC The Open Geospatial Consortium Inc OGC is a non profit international voluntary consensus standards organisation that is leading the development of standards for geospatial and location based services orientation Orientation of a point or a text feature is measured in degrees anticlockwise from grid east orthometric height The distance H along a line of force from a given point P at the physical surface of an object to the geoid outer bounding polygon These go in an anticlockwise direction packing Spaces used as fillers to complete a record or field pecked line A line drawn as a series of dashes photogrammetric survey Photogrammetric surveyors view 3 D aerial images by overlaying the images with existing detailed mapping data they can detect where change has occurred and update the mapping data point A zero dimensional spatial abstraction of an object represented as a coordinate pair point feature A zero dimensional spatial abstraction of an object with its position defined by a coordinate list Po
40. rty constructs e geometry xsd the geometric constructs such as polygon and point e Xlinks xsd a schema based on the W3C XLINK recommendation provided by the OGC to make use of the XLINK constructs The Ordnance Survey provided schemas are e OSVectorMapbDistrict xsd the feature type complex type and simple type declarations O EN OS VectorMap District technical specification chapter 1 v1 0 03 2011 Crown copyright Page 21 of 32 Format description Documentation The OSVectorMapbDistrict schema document defines the following XML namespaces vmd http namespaces ordnancesurvey co uk vmd beta gml http www opengis net gml xsi http www w3 org 2001 XMLSchema instance xlink http www w3 org 1999 xlink The location of the schema is defined as http namespaces ordnancesurvey co uk vmd beta OSVectorMapDistrict xsd Features within each tile are provided in an OSVectorMapFeatureCollection Simple Features Profile Level 0 GML is designed to support a wide variety of capabilities ranging from simple contextual mapping such as OS VectorMap District to products that include complex geometric property types or even spatial and temporal topology The Simple Features Profile of GML 3 1 1 defines a restricted subset of GML allowing scope for greater interoperability This product conforms to Simple Features Profile Level 0 Geometry A geometric property is one that describes a specific geometry All
41. strict beta version is derived from large scale data copyright 2010 Completeness During production many checks are undertaken to ensure that data supplied to customers are both accurate and complete During digital manipulation in creating the data all sources of that data are checked for conformance to specification These quality control checks take the form of e visual checks by operators e data testing against the product specification and e testing carried out on a selection of tiles from a full national set Coordinate resolution Coordinates have a precision of 1 cm and are stored to two decimal places of a metre Generalisation The detail within OS VectorMap District has been generalised from Ordnance Survey large scale data Map generalisation is the process of reducing the scale and complexity of map detail whilst maintaining the important elements and characteristics of the location Map generalisation comprises of the following processes e Selection omission some features that appear at larger scales are not selected at the smaller scales For example many buildings that appear in OS VectorMap Local are omitted from OS VectorMap District e Simplification simplification can take a number of forms in OS VectorMap District It can be line simplification for example in a vector product a very winding stream could have the number of data points that represent it reduced e Exaggeration features that are small
42. ted post or fax it to the address below bde d Dni ER A A EE A A O E AE AE O A A A AE E AAA OEE A E E A E DOM AUO sE E E EE E E E E POOO S aA E A MM M M M M IM D EE Quotation or order reference ccc ccececcccececccecececcececcacecegceauauecuacaueceaueausueueceaueauauenentaueausuenesuecsuecesnesusnesesuenesneneass 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 VectorMap District Product Manager Ordnance Survey Adanac Drive SOUTHAMPTON SO16 OAS If you wish to return it by fax please dial 023 8005 6159 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 DNUS A i un E o OS VectorMap District user guide annexe B v1 0 03 2011 Crown copyright Page 18 of 32 OS VectorMap District Technical specification Contents oection Page no Torte M c T 20 Purpose of this specification and disclaimer eee ee eee 20 Copyright in this specification see eee eee 20 Data copyright and other intellectual property rights sees 20 Chapter 1 05S VectorMap DIS IGE i GML c 21 WISE Bc c e
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