OS Landplan – plots and raster data user guide and technical
Contents
1. data A representation of facts concepts or instructions in a formalised manner suitable for communication interpretation or processing database An organised integrated collection of geographic data which may or may not be spatial data It is stored so that specific applications can access the data by different logical paths A database is accessed and managed by a database management system software for managing database information 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 quality Attributes of a dataset that define its suitability for a particular purpose such as completeness positional accuracy Currency and so on O SSC CSCis OS Landplan plots and raster data technical specification annexe A v1 0 06 2007 Crown copyright Page 19 of 23 data structure The defined logical arrangement of data as used by a system for data management a representation of a data model in computer form data transfer medium This is the means by which computer files are transferred from one computer to another Transfer media may be subdivided into communications media and physical media dataset Data as supplied in a particular format to customers whether internal or external to Ordnance Survey density A measure of the number of units of data held on a stated length of storage surface For example some magnetic tapes may be2. Hall A TE apei MILES va e h i j k x f i gis l 7 Age per ities oy pees E Figure 2 Example of monochrome OS Landplan The product provides an image where the detail has been converted to a grid of pixels which can then be displayed on computer screens or available as a plot The product covers all of Great Britain and is supplied as site centred plots or data aligned to the National Grid Data is converted into a raster format at a resolution of 300 dots per inch dpi and a pixel is equivalent to 85 metres on the ground This resolution has been chosen as it maintains the necessary clarity for text shown on the map and for plot output The colour version assigns three colours red green and blue RGB to each pixel the monochrome version assigns one shade of grey to each pixel The data product can be overlaid with other Ordnance Survey products or a customer s own geographic business data besides providing a detailed geographic context in its own right O SSSCSC CCs OS Landplan plots and raster data user guide chapter 1 v1 0 06 2007 Crown copyright Page 5 of 23 OS Landplan is produced to provide customers with a detailed product that is made available in TIFF LZW format to provide either a map of an area when used on its own or as a means of providing geographic context to help a customer visualise their own data As can be seen from figure 1 the pattern of development within the landscape can cle
3. cee eee ese eee ab eee cess 9 Chapter 5 DALA COMDPIESS ION ectsstercsen cries encnaniennacaccunieasucctuncen imeusaraceiimten ntancnatebuarobinaeetonanpmnansconiccnsanmeaeacts 10 image COMMIS SSI OM sensein i aE EE E E ENE i 10 LOSSICSS COMPTOSSION csecireccotec orccetited a i a a i a a EN aa E 10 EOS SY COMPIE S Oer E E E EE EE E EEN 10 PIER oe E E E 10 Chapter 6 ESE 1 EE AE EE E EE N A T A E E E E 11 Annexe A Product and service performance report form c ccceceeeeeeeeeeeeeeeeeeeeeeesaneeseeneeseaeeesanenees 12 v1 0 06 2007 O SSSCSC SC OS Landplan plots and raster data user guide contents v1 0 06 2007 Crown copyright Page 2 of 23 Preface This user guide hereafter referred to as the guide is designed to provide an overview of OS Landplan 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 A and return it to us Contact details Our Customer Service Centre will be pleased to deal with your enquiries Customer Service Centre Ordnance Survey Romsey Road SOUTHAMPTON SO16 4GU General enquiries c
4. E Flare stack Fribvasssseasstssscresasansicanc hidan asidin daada akaandaa iaaiiai Fourdain Free capes aarp asseceg aesieerteaisanizan parr canoes ipa hepesy aratia tapana Flagetalt ENF SEAS Aa EEE E ATA TOI Guida post iE mE Lera crossing Hy EAEE AA A A O A PEA A ATAA AAE TA Library PAM r A A E T ET T Mermanal PAHITE sncsecccscscasstasssssessese ccecssascnsssssce Mean high water isprings e E EA T Mean low water springs Mifin Monument MH MUE aiian cssacasncases cseunaeseseseneeunseassca Miio post or stone PAM esi inania aanpas ana aana aaa Momma tidal lirit EN Fii i aescssccsnceapscescanaecansjomescassaniraueccanscaaneasenasieas Postis or pola si a A T Public house PR EEE E E E AEA A EAT Fost Ghie PSE paaa aaae aaa Police station PNM NS ee SN TOLTA taettortg Place of worship a E E EEE Schaal eR ides eG T eases AEEA Spring Bi i airina orn aan ai La pin ain AEn aaan a EEY Station JIU eis spsnzcacacanarcenss wecasaecesconsscaroapssssescassusacansassscoarsesses Tank or back Ws ede EAEE A A A NTT Well Chapter 3 Image file directory TIFF LZW The Image file directory for TIFF will contain a selection of the following entries Tag 255 SubfileType An indication of the kind of data contained in this sub file for example value 1 Tag 256 ImageWidth The number of columns in the image the number of pixels per row for example value 2318 Tag 257 ImageLength The number of rows of pixels in the image for example value 2312
5. Tag 258 BitsPerSample Number of bits per component for example value 8 Tag 259 Compression Compression scheme used on the image data for example value 5 LZW Tag 262 Photo Interpretation The colour space of the image data for example value 2 RGB Palette Tag 273 StripOffsets For each strip the byte offset of that strip for example value 320 Tag 274 Orientation Value 1 Tag 277 SamplePerPixel Value 3 Tag 278 RowsPerStrip The number of rows in each strip for example value 2312 Tag 279 StripByteCounts For each strip the number of bytes in that strip after compression for example value 247278 Tag 280 MinSampleValue Value 0 Tag 281 MaxSampleValue Value 255 Tag 282 XResolution The number of pixels per resolution unit in the image width for example value 300 1 Tag 283 YResolution The number of pixels per resolution unit in the image length for example value 300 1 Tag 284 PlanarConfiguration Value 1 Tag 296 ResolutionUnit Units used for resolution for example value 2 Inch Tag 305 Software value gXconvert TIFF V 2 17 Note The values given above are relevant to OS Landplan Colour LZW raster data available through Ordnance Survey Mapping and Data Centres OS Landplan plots and raster data technical specification chapter 3 v1 0 06 2007 Crown copyright Page 17 of 23 TIFF Image directory TIFF OS Landplan ee ee A LZW cede LZ
6. W compressed File Byte Order Little endian Little endian Magic Number Z a G e Number offieldsinIFD 9 S s O NewSubfileType 255 tt O ImageWidth tt Oo O22 O ImageLength 257 2312 2312 BitsPerSample 258 o 8 LZW LZW 282 2 Inch The tag values listed in the above table are relevant to OS Landplan Intel TIFF raster data It should be noted that customers can access tag information from a raster file image by right clicking on a TIFF data image and looking at properties and then left clicking on summary ossa_00388400 tif Properties x General Security Summary 7 Smer ted o _B Recipient Ha Unavailable EI a Image se C File Type Tagged Information File Format TIFI A SE Width 2318 D Height 2312 fev D Color Repre True color RGB Enan SE e Lempel ziv 3 Lr Fating C OS Landplan plots and raster data technical specification chapter 3 v1 0 06 2007 Crown copyright Page 18 of 23 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 Landplan American Standard Code for Information Interchange ASCII A standard binary coding system used to represent characters within a computer binary digit BIT The smallest possible unit of data resulting from a choice between 0 and 1 boundary A boundary forms the division between two s
7. _ ofS Sana OS Landplan plots and raster data User guide and technical specification OS Landplan plots and raster data User guide Contents section Page no PTEE cece reece tice tect eee E ene ovuesenepmecoeneqeeceretonsiasnenacentes 3 COAC T AETS aia ee en eee eee eee ee eee en ee eee eee ee 3 Ucea r Me DOUCE e a E E E E 3 Purpose and disclaimer ccccceccceeccceeeeceeeccueecaeeceuceceueecaueesaeeecueeceueecaueesaeessaeessuessaeesaueesagess 3 COD VOI 11 TMS QUIS sessen rE n AAE E AEA 3 Data copyright and other intellectual property rights cccccceccecseeeeeeeeeeeeeeesaeueesaaeeeseeeeesees 4 MradomarkS osier EAE E E E E EEE E ar 4 Back up provision of the product ccccceccccseececeececeeeeceeeeeseeeeeseeeesseecesseeeessueeeseeeeseueeeseeeessnes 4 Using this QUIGEG SPCCIf CANO Mivacvseisicnnawercicneataxederedantansctavbacsaenbvsdasaderiennedeceanasieskengenterbinestexeacsansts 4 Chapter 1 PEE CON PO NAA A EES E EAA E EE AE E E E E AEE E E E 5 Chapter 2 Be Di aE E E A E nest A E AEA E A E NEA EEEN E EEEE T E S 7 Scottish and Welsh place area names cccceccccseececeneeeceececceececsueeeseueeseaeeesseeeseueeeseeeeesages 7 Chapter 3 SAG UNO PAET ETE TT AAT AST AATA E SAET E AT AIEA I TT E A T 8 OV CF E es sone E E E A R 8 Chapter 4 POMA S onne cutasbuma nan edeacucatamaosGu ban acenqaedaasncetdacssimeunacs te buccoumiuiaacnconeuacisinacceimukes 9 MONT ae sens apse pase cence cen ee ne ae rcs
8. a wavelet based image compressor viewer and file format for large raster images that enables instantaneous viewing and manipulation of images locally and over networks while maintaining maximum image quality northings See rectangular coordinates O CSCSCSC CSSCti s OS Landplan plots and raster data technical specification annexe A v1 0 06 2007 Crown copyright Page 21 of 23 Oracle The relational database management system used for the 1 50 000 Scale Gazetteer order A request from a customer for the supply of map data The scope of an order may be constrained by an agreement for a period licence service origin The zero point in a system of rectangular coordinates pixel In this product a pixel is a single point represented by a square points A pair of coordinates raster data Attribute data expressed as an array of pixels with spatial position implicit in the ordering of the pixels RGB colour model The RGB colour model is an additive model in which red green and blue often used in additive light models are combined in various ways to reproduce other colours The name of the model and the abbreviation RGB come from the three primary colours red green and blue These three colours should not be confused with the primary pigments of red blue and yellow known in the art world as primary colours real world object The real world feature represented by a feature for example a building a fenc
9. alls 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 8079 2906 Email customerservices ordnancesurvey co uk Or visit the Ordnance Survey website at www ordnancesurvey co uk 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 specification 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 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 liabil
10. apter 1 0 2154 1 ot 10 Co Aer eee erence eee ee een eet net een ent E eee EE Cre AE eer et mere eer ee 15 Chapter 2 Ee E rtp deca ph E EE E se pared E ea pda gl Maple E P naka ana T O E O E T NA 16 Chapter 3 image Nle directory TIFF LEW aiino aaa 17 TIEF eree E E E E E E 18 Image directory TIFF OS Landplan cccccccccssseeeccesseecceeeeeceesseessegeeeeseuseesssaseeesageees 18 Annexe A O S E A TEA 19 v1 0 06 2007 CC ee OS Landplan plots and raster data technical specification contents v1 0 06 2007 Crown copyright Page 13 of 23 Introduction Purpose of this specification and disclaimer This is the technical specification hereafter referred to as the specification applicable to OS Landplan 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 2007 All rights reserve
11. arly be seen and this makes OS Landplan particularly useful for site development locations OS Landplan plots and raster data user guide chapter 1 v1 0 06 2007 Crown copyright Page 6 of 23 Chapter 2 Content OS Landplan shows the following features e buildings structures and leisure areas e roads paths and tracks e vegetation and surface features e water features and associated detail e railways and associated detail e height and control information e archaeological and antiquity information e administrative boundary information e text e miscellaneous information remote areas telephone lines footbridges house names and all buildings and e contours are optional The following administrative boundaries are shown Greater London Assembly constituency Unitary authorities Parliamentary constituency Westminster Civil parish England Parliamentary constituency Scotland Community Wales Assembly constituency Wales Assembly electoral region Wales Scottish and Welsh place area names Where a name has an alternative form in a different language and it is not possible to establish which of the two names is more useful and acceptable both names will be shown Where there is insufficient space to show both names only one will be shown e In Scotland the anglicised version and e In Wales the Welsh version O CSSCSC SC OS Landplan plots and raster data user guid
12. copyright 0033428 OF 07 Version 1 14 Ordnance Survey Gravel pit oe MSN Rock ah oll Rock fscattersc a Shingle feaytas eet he get jii eT Boulders eo ae Boulders scattered ge Refuse tip or slag heap Sand Sand pit A ha Bape Trey Top of cliff ETT Common abbreviations Boundary information WMA nr OE eter aaa titi tities Unitary authority Flirt tibia scssscsccsssassssasss aansssssnstearssacasacasssczsssssersaganinansazvetcs District piat hmt ayo ciieceeseseeceeetenenensaentereseentenss Metropolitan district EEEE E LEETE TEATE ETETE EEEE Community CP Ehi araja aagana apaan apanapa Civil pansh Boro Const Hoy eiiie ee Borough constituency Ta CORME Php n Courty constituency Burgh Const BAY s s isisiiiisissiinisisrsaiasiesin Burgh constituency EEA Hh iaa ani aa European lector regon LE Bih is sscssacssesssscsesscasscssssanscasssassus tanacsssrauadiaze London borough Bah Const Bof Assembly constituency Publ EA iscsssssssecsssscsssassssnvsssscssssansiznsass Assembly electoral region P Const BoY Scoteh parlamentary constituency PEA Bdy oo eee ces cotish pariamantary electoral regon GL Ash Cons Greater London anhori assembly constiterncy Other information WD aspasia gaaat eaapessinespaas unin Tatie grid Gps ci atte Stites tee tated Chimney ee College T ETAT E A A A ENEA E TA ETT Court El Sub Bit iiien Ekctricity sub saton X KARAREN PPEE PEPEPEPE IEEE EEEE ETET TT EEEE ETE Footbridge E E TAA A EE
13. d Any part of this specification may be copied for use internally in your organisation or business so that you can use OS Landplan for the purpose 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 O CSSSCSC C CSCiss OS Landplan plots and raster data technical specification introduction v1 0 06 2007 Crown copyright Page 14 of 23 Chapter 1 Specification The following chapters include information about OS Landplan colour monochrome site centred plots and raster data file compression symbology and format Specification OS Landplan Data source 1 10 000 scale production database Availability National coverage Resolution 300 dots per inch Data structure Raster Data transfer format TIFF 8 bit 256 RGB colours compressed LZW Data specification All map features with the option of contours Update frequency Continuous update see chapter 6 in the user guide PDF Plot options Standard sheet 1 10 000 5 km by 5 km 25 km Colour or monochrome 4 1 5 000 1 5 000 800
14. e a wood rectangular coordinates Also known as x y coordinates and as eastings and northings These are two dimensional coordinates that measure the position of any point relative to an arbitrary origin on a plane surface for example a map projection a digitising table or a VDU screen stipple Used to produce light or dark shading for example building water fill this is dependent on spacing of the dots the denser the dots the darker the effect string A set of items that can be arranged into a sequence according to a rule supply format The file format in which the data is supplied to the customer tag Tags are unique numbers that are used for identifying specific information in TIFF files for example image width image length bits per sample photo interpretation and resolution terminator Character or character string or field or record used to signal the end of a record or section or volume or database tile A unit of map used to divide large areas into regular and more manageable sizes TIFF TIFF is a tagged image file format based file format for storing and interchanging raster images with the most recent version 6 0 published in 1992 transfer format The format used to transfer data between computer systems In general usage this can refer not only to the organisation of data but also to the associated information such as attribute codes which are required in order to successfully complete the
15. e cere en ee ess cate ete ce cbc cee dieses cede ean T ener ce nee cee meritless aed Gen ea am EEEE EA RCS AON siete tee eteagac te te E AT canta E E E VAY 8 6 sic a eee a ne ne eee ne eee ee ee ee ee ee eee ee eee eee ee eee ee A eee Quotation or Order reference ccc ccececcccececccecececcececcacecegceauauecuacaueceaueausueueceaueauauenentaueausuenesuecsuecesnesusnesesuenesneneass Please record your comments or feedback in the space below We will acknowledge receipt of your form within 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 Landplan Product Manager Ordnance Survey Romsey Road SOUTHAMPTON SO16 4GU If you wish to return it by fax please dial 023 8079 2615 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 O SSCSC SCC OS Landplan plots and raster data user guide annexe A v1 0 06 2007 Crown copyright Page 12 of 23 OS Landplan plots and raster data Technical specification Contents section Page no O AAEE T 14 Purpose of this specification and CISCIAIMET cccccseececeeececeeeeecee cesses cesseecesaeeeeseeeeeseeeeees 14 Copyright in this specification cceecccccseeeecceseeeceeseecceasceecsaueeecsaeeeeseaeeessageeessageeesseaeeeeess 14 Ch
16. e chapter 2 v1 0 06 2007 Crown copyright Page 7 of 23 Chapter3 Scale OS Landplan is derived from large scale information surveyed at 1 1250 scale covering major towns and cities e 1 2500 scale smaller towns villages and developed rural areas and e 1 10 000 scale mountain moorland and river estuary areas Cartographic generalisation is used to emphasise simplify select and sometimes omit features to produce a cartographic representation of the landscape at a scale of 1 10 000 The recommended printed copy or plot output is at 1 5000 to 1 10 000 scale but viewing data on a computer screen is normally between 1 5000 and 1 8000 scale Coverage OS Landplan is available in a variety of plots and data sizes see technical specification for details Data or plots can be site centred using a postcode a place name or a National Grid reference O SSCSC OS Landplan plots and raster data user guide chapter 3 v1 0 06 2007 Crown copyright Page 8 of 23 Chapter 4 Formats OS Landplan data is available as e Tagged Image File Format TIFF with 256 RGB colours with LZW compression TIFF TIFF is a file based format for storing and interchanging raster images with the most recent version 6 0 published in 1992 There are two types of architecture for a TIFF Many mainframe computers use what is known as an OS big endian Motorola architecture Most modern computers including personal comput
17. ed as data to copy to a back up medium Using this guide specification 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 O CSSCSC CSSC OS Landplan plots and raster data user guide preface v1 0 06 2007 Crown copyright Page 4 of 23 Chapter1 Introduction OS Landplan is available as both contextual map raster data and as plot output generated from large scale source information It is available as site centred output in colour or monochrome with and without contours in TIFF RGB format using LZW Lempel Zif Welch compression Examples of the colour and monochrome versions are shown in figures 1 and 2 below DA Peay i i SI T BORE peer pus iv T Fr i m Farm Ea tI Y n rh i E E i s w ji AEPA Ruy im z F i F ae i t es _ ie eet el li i E 2m sire omer He hen Oo eg qi ene erecta et H la HE aN qe y MNA R See ATE RN Set a a Ge OER at Mee IN r z TELING E T lt a a Gage Confit at Teee ER at a pS aii bT ul
18. efine positions on the Earth s surface georef A definition for registering raster images within a geographic framework is the process of assigning map coordinates to the raster image data and resampling the pixels of the image to conform to the map projection grid gigabyte Gb 1073 741 824 bytes a measure of data storage capacity see megabyte kilobyte Kb 1 024 bytes a measure of data storage capacity 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 linear feature Map feature in the form of a line for example river boundary that may or may not represent a real world existent feature local origin The local origin of rectangular coordinates is the south west corner of the 1 km by 1 km National Grid square they identify 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 1250 1 50 000 and so on megabyte Mb 1 048 576 bytes a measure of data storage capacity see gigabyte National Grid The metric grid on the Transverse Mercator projection used by Ordnance Survey on all post Second World War mapping to provide an unambiguous spatial reference in Great Britain for any place or entity whatever the map scale MrSid MrSid Multi resolution Seamless Image Database is
19. egetation Hon coniferous tess Non coniferaus tress scattered E co Coniferous trees Ea Goniferous trees scattered x Positioned tress Fan Orchard Coppice or osiars Rough grassland itis wily Heath ailis Serub Ma Cin Marah salt marsh or reeds aih viL Bulldings General building Important building lasshouss OS Landplan plots and raster data technical specification chapter 2 v1 0 06 2007 Crown copyright Page 16 of 23 Height Information in metres Contour lines a and values ee Spot heights ee fixed by aerial survey t Spot heights iim fixed by ground survey Triangulation station A Point and line features Pylon flare stack or fe lighting tower iseneral detail Underground detail ne ee est oP Overhead detail ee Narrow gauge railway SH MultHtrack railweny Single track railway Point feature for example GPMS MP a Mon Aoman antiquity asile Site of antiquity a Talephane line iwhere shown Electricity transmission line with poles 5 Water features Water feature is p a hi Direction of flow arowa Mean high water springs alte Sy Mean how water springa MLE The representation of a road track or path ls ne ewkdence of a right of way Ordnance Survey and the OS Symbol are registered trademarks of Ordnance Survey the national mapping agency of Great Britain Ordnance Survey Crown
20. ers PCs use the little endian Intel system OS Landplan TIFFs are supplied with Intel architecture Converting between these two systems is possible but as a general rule modern software should be expected to handle both of these outputs without operator intervention OS Landplan conforms to the TIFF 6 0 standard Customers are recommended to contact their system suppliers to ensure that it can read the Intel little endian TIFF architecture O CSCSSCSC CCt s OS Landplan plots and raster data user guide chapter 4 v1 0 06 2007 Crown copyright Page 9 of 23 Chapter 5 Data compression The data volumes for each file format are influenced by the level of data compression Image compression When an image is compressed duplicated data that has no value is removed or saved in a shorter form which reduces a file s size For example if large areas of water are the same tone only the value for one pixel needs to be saved together with the locations of the other pixels with the same colour When the image is edited or displayed the compression process is reversed When raster is compressed not only are the data volumes reduced but the user can download display edit and transfer images more quickly There are two forms of compression lossless and lossy Lossless compression As its name suggests lossless compression does not lose information within an image A lossless compression retains the original quality of an
21. image when it is uncompressed for example OS Landplan data has LZW compression This process doesn t provide much compression so file sizes remain large Lossless compression is used mainly where detail is important such as when planning to make large prints Lossy compression This process degrades images to some degree meaning that the decompressed image isn t quite the same quality as the original The more an image is compressed the more degraded it becomes In many situations such as posting images on the Internet or printing small to medium sized prints the image degradation isn t so obvious If a lossy compressed image like the one shown in figure 3 below is over enlarged the degradation will become apparent and therefore OS Landplan is not supplied using a lossy compression Enlarged lossy compressed image TIFF TIFF is one of the most commonly used ossless image formats TIFF is primarily designed for raster data interchange and is supported by numerous image processing applications This permits much more efficient access to very large files that have been compressed TIFF LZW a popular lossless data compression technique that uses a simple compression algorithm O SSSCSC CCs OS Landplan plots and raster data user guide chapter 5 v1 0 06 2007 Crown copyright Page 10 of 23 Chapter6 Revision The product is updated via a 1 10 000 revision programme The revision programme for OS Landplan is determ
22. imilar real world objects for example property boundary or administrative boundary and is defined by one or more lines byte A unit of computer storage of binary data usually comprising 8 bits equivalent to a character character A distinctive mark an inscribed letter one of a set of writing symbols character code The binary representation of a single element of a character set for example EBCDIC ASCII coordinate pair A coordinate pair is an easting and a northing see rectangular coordinates coordinate transformation A computational process of converting an image or map from one coordinate system to another compact disc Read only memory CD ROM A data storage medium A 12 cm disc similar to the audio CD It is an alloy disc pitted with tiny holes and then coated in plastic A laser head reads the pattern of the holes and translates them into binary data copyright The sole legal right to print or publish a work Crown copyright subsists in all Ordnance Survey publications for a 50 year period from the end of the year in which they were first published by virtue of the Copyright Designs and Patents Act 1988 customer An organisation or individual that makes use of Ordnance Survey s data supply facilities This includes both direct sales customers of Ordnance Survey as well as customers of Licensed Partners It does not include anyone or any organisation that has access to Ordnance Survey material without charge
23. ined by assessing the following factors e known surveyed change captured by the surveyor e change indicated by photogrammetric survey which includes rural survey sweep and e consideration is given to how long it has been since an area was last revised Priority is given to prestige sites categorised as significant items of change such as major road construction projects All tiles in the revision programme are fully revised which means that all surveyed change is included in the revision not just significant items of survey change Where a line feature ends by intersecting the tile edge it is matched with its corresponding feature on the adjacent tile so that both features end on the same unique coordinate and both features have the same feature code The representation of detail across the tile edge will be of a cartographically acceptable standard when plotted or displayed at scale This is shown in figure 4 below Before 1 10 000 scale edge match After 1 10 000 scale edge match has taken place Figure 4 Edge matching O CSCSCSC CSCiss OS Landplan plots and raster data user guide chapter 6 v1 0 06 2007 Crown copyright Page 11 of 23 Annexe A Product and service performance report form Ordnance Survey welcomes feedback from its customers about OS Landplan 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 PY UII UN c
24. ity 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 Copyright in this guide This guide including for the avoidance of doubt any mapping images reproduced herein is Crown copyright 2007 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 but not otherwise O SCSCSC Cis OS Landplan plots and raster data user guide preface v1 0 06 2007 Crown copyright Page 3 of 23 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 a
25. m by 800 m 0 64 km with or without contours A4 1 10 000 1 10 000 1 600 m by 1 600 m 2 56 km Site centred 5 km by 5 km 1 10 000 1 10 000 5 km by 5 km 25 km Site centred 3 km by 3 km 1 5 000 1 5 000 3 km by 3 km 9 km OS Landplan customised plot 1 5 000 to minimum paper size 160 mm by 160 mm Approximate storage volumes 1 10 000 at maximum paper size 2 500 mm by 730 mm Compressed 0 5 to 24 Mb intervals of 500 metres TIFF Data options OS Landplan Data source scale minimum order 1 km Colour or monochrome maximum order 25 km TIFF with or without contours Approximate storage volumes compressed 0 5 to 2 Mb If LZW compressed formats are used then registration may be required Guidance on the Unisys licence is available on the Unisys website at http www unisys com about__unisys Izw ee OS Landplan plots and raster data technical specification chapter 1 v1 0 06 2007 Crown copyright Page 15 of 23 Chapter 2 Legend OS Landplan Legend Boundary Information County England arilyi District unitary authority metropolitan district Landon borough Civil perish or community Bore constituency county constituency burgh constituency parliamentary constituency parliamentary aectoral region assembly constituency assembly alectoral region European alectoral region or Greater London authority assembly constituency Boundary post or stone Boundary tree Dak Co Vegetation Area of wooded v
26. ning nearly all the original image s quality colour and detail ECW is a lossy format meaning that some information is lost when the image is converted from its original format to the ECW format However wavelet compression is very good at retaining the character of images so the amount of loss is very small JPEG An image named after the Joint Photographic Experts Group it uses a lossy compression format It is designed for compressing full colour or monochrome images of natural real world scenes and works well on photographs It is the de facto standard for photographs on the Web O CSSSCSC CSCtis OS Landplan plots and raster data technical specification annexe A v1 0 06 2007 Crown copyright Page 20 of 23 encoding The process of converting information to a computer readable form for example digitising maps extended binary coded decimal interchange code EBCDIC An 8 bit character encoding scheme for example 10011100 These can also be letters or specific characters for example feature A geographic entity such as a building or stream either taken from a map or surveyed directly from the real world Can be a point symbol text or line format The specified arrangement of data for example the layout of a printed document the arrangement of the parts of a computer instruction the arrangement of data in a record geographic coordinates Coordinates usually expressed as latitudes and longitudes which d
27. recorded at a density of 1 600 bits per inch bpi Often referred to as packing density delivery mechanism The method of supply of data to a customer such as offline and online descriptive name Names describing a real world object or feature for example school as shown on the OS Landplan map definitive name The name as shown on the OS Landplan map digital Data that is expressed as numbers digits in computer readable form digital update The supply of digital data to a customer following revision by the production team direct sale A direct transaction between Ordnance Survey and a customer distinctive name A text feature that form s a name that distinguishes it from other text features of the same type for example Millbrook School dots per inch dpi The resolution or fineness of a raster image eastings See rectangular coordinates ECW The Enhanced Compressed Wavelet ECW raster image compression software has been designed to compress display serve on the Internet and distribute raster The key characteristic of wavelet based compressions is that it is able to preserve a very good quality of the image with high compression ratios This compression format uses mathematical wavelet transformations to store image data rather than storing a grid of values for image pixels such as TIFF or other common formats This allows a great reduction in the amount of disk space it takes to store large images whilst retai
28. s 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 required copyright and database acknowledgements in a conspicuous position Trademarks Ordnance Survey the OS Symbol Landplan and OS are registered trademarks of Ordnance Survey the national mapping agency of Great Britain Acrobat Reader and Adobe are registered trademarks of Adobe Systems Incorporated Intel is a registered trademark of Intel Corporation Motorola is a registered trademark of Motorola Inc Oracle is a registered trademark of Oracle International Corporation Unisys is a registered trademark of Unisys Corporation UNIX is a registered trademark of X Open Company Ltd Back up provision of the product You are advised if the product is suppli
29. transfer O SSCSC CCi s OS Landplan plots and raster data technical specification annexe A v1 0 06 2007 Crown copyright Page 22 of 23 transfer medium The physical medium on which digital data is transferred from one computer system to another for example compact disc UNIX An operating system that supports multitasking and is used by many workstations and mini computers update The process of adding to and revising existing digital map data to take account of change volume A physical unit of the transfer medium that is a single disk or a single DVD CC OS Landplan plots and raster data technical specification annexe A v1 0 06 2007 Crown copyright Page 23 of 23
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