Code-Point with polygons user guide
Contents
1. Only addresses in ADDRESS POINT having a PQ value of 2 or 3 are used to create the polygons file Addresses of lower quality will be included in the discards file e PO boxes are not included but their postcodes are supplied in a look up file in the Data folder on the CD ROM e A supplementary file Vertical street look up file in which postcodes for which there are only addresses with a PQ value of 1 4 or 5 represented and given a point grid reference in ADDRESS POINT is also provided Due to the nature of postcode geography the polygons representing some unit postcodes are unavoidably split Every effort has been made to ensure the absolute minimum of postcodes is represented by multiple polygons Furthermore these split polygons representing a single postcode remain a single object with one set of attributes When this occurs any issues arising will depend upon the mapping package used and the nature of its use Typically users may see only one of the group polygons labelled however it is worth checking the labelling options in your mapping package If however the user was to query the polygon s or display associated data using the postcode as a link field all the split parts of a polygon would correctly represent the associated attributes An example of such a polygon is shown on the next page with seed Address point locations for that postcode shown in red Wherever it is possible without moving the boundary to the w2. data compression File SIZES eei a boes ets Updateen A A SAES Code Point with polygons version numbering PFOGUEECEVEIO DITION Cas cz ancncecssingcactdancpcadsduhasansenehadendependanntasdhdaessuntwedeapensanu emebsien pel duiet AN EES EDAEN ERTA AAA TERTA E AEREO EBA AADA EAA TENERE Code Point with polygons product structure Structure of the Code Point with polygons CD ROM Using Code Point with polygons Chapter 3 Code Point with polygons explained cceeeeeseeeseesseeeeeeeeeeeeeaes DESCrIPUOMOFNS DOV GON Seters anan eE sch sacpyeestte canes aud ions cu aaa EAEE E A aa Tii a e a Chapter 4 Quality statements pecifiCatiOM sieurs invena ennai ienien e a AEE AVATA NTa ENTERA E a Eee Eee Lineage Completeness 66 CUMEN CY enisi Attribute accuracy Logical consistency IMC EAE E AE AE bei eldest had eldest fa chal ale E EE E dala bal eed aa E vases he died aVadebeats Suh alesse leads FOTN AUS pinch che sa ca E Sacer tea A E A E E A sees Record breakdowns for the transfer of Code Point polygons MID MIF Record breakdowns for the transfer of Code Point polygons in E00 uo ee Appendix A GIOSS AY ies sicats tna de cdswewssancncaneasn T ch tojacvdiangddsanasyncandatioondeandbesent A A Appendix B Product and Service Performance report form cccccecccceeccseeeceeeee neces sees eeeeeeeeseeeee ee eeGsHeAsAecGHESAGESSSGAEASGOSASAA EEE OA SAGES EEEGHAEEE NEES oS Chapter 1 Introduction Using
3. document may be copied or incorporated in products services or publications you generate for onward sale or as free promotional or support material without the prior written permission of Ordnance Survey Ordnance Survey the OS Symbol ADDRESS POINT Code Point Land Line and Land Line Plus are registered trademarks and Boundary Line is a trademark of Ordnance Survey the national mapping agency of Great Britain Adobe is a registered trademark of Adobe Systems Incorporated Arcinfo ArcView and ESRI are registered trademarks of Environmental Systems Research Institute Inc Autodesk is a registered trademark of Autodesk Incorporated BT is a registered trademark of British Telecommunications plc GEOPLAN is a trademark of Yellow Marketing Information Ltd MapInfo is a registered trademark of MapInfo Corporation Pentium is a registered trademark of Intel Corporation PAF and Royal Mail are registered trademarks of Royal Mail Group plc Contents Chapter 1 HMM CNG WM asics eset See A E T camaseeeceycesncden pap eiteciess as ven eeaneced E E Gasake E E E E uses E E eaaauepoenane T Using thiS USER guide cnonadssnacnennana Chapter 2 Overview of Code Point with polygons sssssssssrseseessssrrrseesesrrerne Data overvieW e Basic principles What you need to use Code Point with polygons EIRO NEUE E EE TA E E E A EE E T E E Code Point with polygons supply options Manster TOnMatS ineine e ENT Media
4. Code Point with polygons os User guide e Preface Contact details This user guide contains all the information you need to make effective use of Code Point with polygons It is designed to help you understand the information contained in the data as well as providing detailed technical information and the data format specification This user guide has been checked and validated before issue and we have used our reasonable endeavours to ensure that the contents are accurate If you find an error or omission or otherwise wish to make a suggestion as to how this user guide can be improved please contact us at the address shown under Contact details The Customer Contact Centre will be pleased to deal with your enquiries Phone 023 8030 5030 Fax 023 8079 2615 Email customerservices ordsvy gov uk Welsh Language HelpLine in Welsh phone 08456 05 05 04 or write to Customer Contact Centre Ordnance Survey Romsey Road SOUTHAMPTON United Kingdom S016 4GU Visit the Ordnance Survey web site at www ordnancesurvey co uk Product performance Liability If you have any problems with or identify any errors in the data or this user guide please use the Product and service performance report form at appendix B A full description of the terms and conditions of supply and use of Code Point with polygons is detailed in the signed Customer contract held by you or your organisation Ordnance Survey has used its reasonabl
5. Milton Keynes B for Birmingham or W for London West The postcode area code constitutes the first part of the outward code postcode district A sub area of the postcode area specified by the character substring within the first half of a full postcode which may be numeric alphabetic or alphanumeric for example 42 from MK42 6GH or 1A from W1A 4WW There are approximately 2 800 postcode districts in Great Britain Note There are certain non geographic districts In these instances a district code is allocated to cover all large users in the postcode area postcode sector A sub area of postcode district whose area is identified by the number third from the end of a full postcode There are approximately 9 000 postcode sectors in Great Britain An example of a postcode sector code is 3 from GU12 3DH Post Office box Generally a non geographic address allocated with a number by the Post Office PO Boxes within ADDRESS POINT are now matched to the Royal Mail delivery office at which they are based except in the BT postcode area rather than the average of matched addresses within the postcode sector Postzon A file marketed by Royal Mail that allocates a National Grid reference to each postcode unit This coordinate is derived from a 100 metre square that contains the first of the range of addresses that form the unit postcode unit postcode See postcode Appendix B Product and service performance report form Ordnance
6. Survey welcomes feedback from its customers about Code Point with polygons If you would like to share your thoughts with us please print a copy and when completed post it to the address below NOU MANNMEG orien en a e ea a e ada ae Aa Aiar PANONE einant midi eiae a a Aa aaa aa e O EE acviat Organisation sires pno ana E E EEEE AEEA FAX e e aad Addes Si e a a a a a a saamiaesuass Emal aee a a a PostCode dneni enda ee a aE AE EA EN AT Quotation or order reference e ssssssesssessssseeerrrrrrrrrererrrerrrrrrre 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 Customer Contact Centre Room C015 Ordnance Survey Romsey Road SOUTHAMPTON SO16 4GU 5
7. ales that is contained in Royal Mail s PAF product with the following exceptions postcodes for which there is no data of sufficient quality in ADDRESS POINT postcodes for which there is no data that lies within the extent of realm coastline in ADDRESS POINT e postcodes that relate to PO boxes and e postcodes that are vertically stacked that is two or more postcodes within a single building that are represented by a single Land Line building seed In these situations a single square polygon represents all the postcodes attributed to the single building seed Currency Because of the dynamic nature of the source information any comprehensive national list of postal addresses can never practicably be 100 correct The time taken to collect and incorporate additions changes and deletions from the real world into the PAF then into ADDRESS POINT and hence into Code Point and Code Point with polygons can only add to any lack of currency Attribute accuracy All polygons are attributed Nothing is done to change the accuracy inherited from the PAF source data Logical consistency The logic used to create both the Code Point point and polygon data is consistent across the whole of each dataset 5 Medium Code Point with polygons is supplied on CD ROM ISO 9660 Formats MID MIF is the transfer format of the MapInfo Company and E00 is the transfer format of ESRI UK Ltd The data conforms to the latest published spe
8. cification Record breakdowns for the transfer of Code Point polygons MID MIF Field Name Type Width Description Example POSTCODE Character 8 Full Postcode from Code Point HG1 1BA UPP Character 20 Unique Polygon Identifier 00004000000000590783 Record breakdowns for the transfer of Code Point polygons in E00 Field Name Type Width Description Example POSTCODE Character 8 Full Postcode from Code Point HG1 1BA UPP Character 20 Unique Polygon Identifier 00004000000000590783 Note E00 format automatically adds fields to show the values for Surface Area Perimeter and Region Identifiers internal For example the E00 file for Postcode HG will also feature the following fields AREA PERIMETER HG_REGION_ and HG_REGI Appendix A Glossary addressed premise A permanent or non permanent building structure with an address being a potential delivery point for Royal Mail Examples of an addressed premise would be a house a flat within a block of flats a caravan site a bollard to which several houseboats may be moored or an organisation occupying the whole of a building ADDRESS POINT An Ordnance Survey text data product which relates Royal Mail Postcode Address File PAF addressed properties within Great Britain to the National Grid area based postcode A type of large user postcode which is allocated to a small number of organisations who receive an exceptionally large amount of mail These postcodes still relate to a geograph
9. de area files Code Point NTF format in 121 postcode area files Polygons E00or MD MF in 120 postcode area files Vertical streets PO boxes Discards Using Code Point with polygons The uses of Code Point georeferenced postcode data are covered in the user guide specifically issued for use with that product This user guide will focus on the use of the unit postcode polygons The polygons provide a boundary around the addresses within unit postcodes and so can be used to relate any occurrence or point within that boundary to postcode concerned In this way analysis of data on a postcode basis can be achieved even when the occurrence is not at a postcoded address To hes PUCER f i Bungalo l my ies si EIH t a ik HBU AOE eee et y F i Where data is already analysed by postcode a pictorial representation for example using a colour scheme can be obtained that will differentiate between postcodes or groups of postcodes Lae Info Tool LPP 00004000000001 293753 PC_Area SO Chapter 3 Code Point with polygons explained The standard Code Point product is described in detail in the Code Point user guide This chapter will concentrate on the polygons provided within the product Description of the polygon set The set is produced by the tessellation of ADDRESS POINT coordinates for individual Royal Mail delivery addresses
10. e efficiently Code Point with polygons requires only a reasonably modern and powerful PC or similar ideally with a Pentium II 200 processor or similar and a minimum of 32 Mb RAM If national cover of the product is to be used a hard disk of at least 1 Gb capacity will be required Software Most proprietary GIS packages will suffice for example MapInfo ArcView or Autodesk products Code Point with polygons supply options There is one supply extent provided within the product That is national cover That is defined as Great Britain for the polygon set and United Kingdom for the Code Point point data Although the polygon coverage does not include Northern Ireland the point data for that province BT postcode area has been left in the data for simplicity of production Transfer format s Code Point polygons are available in the following formats the preferred choice of which will be influenced by the software used e Arclnfo Import Export format E00 e Maplnfo Interchange format MID MIF Media data compression Code Point with polygons is supplied on CD ROM The Code Point and polygon files only contain substantial amounts of cartographic and attribute information which in both E00 and MID MIF formats necessitate that file compression be used to distribute the files File sizes The following table outlines the total file sizes for both formats in compressed or uncompressed states Compressed Uncom
11. e endeavours to ensure that data supplied is free from errors and omissions We will remedy as soon as reasonably practicable errors and omissions that the customer notifies to us in writing It is the customer s responsibility to ensure that data ordered is suitable for the intended purpose We will not be liable to the customer or any other party for any loss damage inconvenience or expense resulting from the use of or reliance upon the data Delivery of Code Point with polygons Data copyright You are advised to copy the supplied data to a back up medium Written notification of any deficiency in the data or damage to the goods must be given to us within 28 days of receipt of your Code Point with polygons data All Ordnance Survey digital map data are Crown copyright It is the responsibility of the holder of the digital map data to ensure that any plotted or printed output contains the required copyright acknowledgement If you have any queries relating to copyright please contact us at the address shown under Contact details User guide copyright Trademarks This document is Crown copyright 2003 All rights reserved It is supplied with Code Point with polygons to allow you to make effective use of the data Any part of it may be copied for your own business use Business use is defined as actions related to business decision making or as part of day to day operations associated with the running of a business No part of this
12. fo a file summarising the content and file structure of the CD ROM e Metadata lists the number of postcode units sectors and districts in each postcode area and the date of the most recent version of the Royal Mail Postcode Address File PAF that has been incorporated into the data e Codelist a list of the ONS county district and ward codes and their full text equivalents e User guide this user guide The Data folder contains the following subfolders e Code Point containing Code Point point data in two sets of 121 postcode area files both CSV and NTF e Polygons containing polygon data in 120 postcode area files either MID MIF or E00 e Vertical Streets a look up table of vertical street reference codes and the postcodes contained in them e PO_boxes a look up list of the postcodes that have not been included in the polygon creation process because they are PO boxes e Discards a look up list of the postcodes that have not been included in the polygon creation process because there are no ADDRESS POINT records of sufficient positional quality PQ classification Structure of the Code Point with polygons CD ROM Text The text files in the Info folder files are text txt format with the exception of the user guide which is an Adobe PDF file Codelist User guide Code Point CSV format in 121 postco
13. ical area but may overlap other sector areas or be scattered building A physical walled structure connected to foundations that has or will have a roof This definition includes buildings surveyed at foundation stage Code Point Code Point provides a precise geographical location for each postcode unit in Great Britain delivery point A Royal Mail defined point to which mail is delivered This may be a property private address organisation mailbox or even the name of an individual These categories are derived from The Complete Guide to Postcode Products from Royal Mail Distinct from the addressed premise because there may be more than one organisation at an address Gridlink Gridlink is the name given to a joined up government initiative involving Royal Mail the Office for National Statistics the General Registry Office Scotland Ordnance Survey Northern Ireland and Ordnance Survey All these organisations are involved in the georeferencing of postcodes and the relating of postcodes to administrative and National Health areas inward code or incode See postcode Land Line data The Ordnance Survey s definitive product range of large scale maps in digital form Land Line has a vector point and line structure which collectively forms 36 feature codes with a further 27 feature codes in Land Line Plus representing an accurate and detailed representation of the real world large user postcode A large user postcode
14. in including approximately 170 000 large users postal address A postal address is a delivery point which is currently receiving mail There may be many delivery points within an individual building structure as shown in Land Line data postcode An abbreviated form of address made up of combinations of between five and seven alphanumeric characters A postcode may cover between 1 and 100 addresses The average number of addresses per postcode is 15 There are two main components of a postcode The outward code also called outcode The first two to four characters of the postcode constituting the postcode area and the postcode district It is the part of the postcode that enables mail to be sent from the accepting office to the correct area for delivery The inward code also called incode The last three characters of the postcode constituting the postcode sector and the postcode unit It is used to sort mail at the local delivery office For example OUTWARD INWARD NW 6 4 DP unit postcode sector district area postcode area An area given a unique alphabetic coding by Royal Mail to facilitate the delivering of mail The area is identified by one or two alpha characters at the start of the full postcode the letters being derived from a town city or district falling within the postcode area There are at present 120 postcode areas in Great Britain for example SO for Southampton MK for
15. is allocated when e afirm or business at a new address regularly receives in any one day 25 or more items of mail in a town area or 50 or more items in a rural area e a private box PO box is provided Royal Mail Selectapost service is provided e a Business Reply or Freepost licence is taken out or e all Freepost and Business Replies have their own postcode matched address An address resulting from a match between the Land Line address data and the PAF which has been allocated a coordinate position The match may be a result of either manual or automatic matching the latter encompassing both full and fuzzy logic matching National Grid reference NGref The National Grid provides a unique reference system that can be applied to all Ordnance Survey maps of Great Britain The map of Great Britain is covered by 100 km by 100 km grid squares with the origin lying to the west of the Isles of Scilly When a National Grid reference is quoted the easting left to right direction is always given before the northing upwards direction A National Grid reference to one metre will identify the spatial position of the CPLC outward code or outcode See postcode PAF Postcode Address File The PAF was created when all the separately held information was assembled and stored on a Royal Mail central computer system PAF now contains the postal addresses and postcodes of approximately 26 million delivery points in Great Brita
16. pressed Total including associated and metadata files Polygons in MID MIF format 582 Mb Polygons in MID MIF format 2 21 Gb Polygons in E00 format 1 1 Gb Polygons in E00 format 4 15 Gb Update Updates will be at six monthly intervals Code Point with polygons version numbering Each edition of Code Point with polygons will have a version number showing the year the release number for that year and the version if appropriate of that release for example 2001 1 0 is June 2001 first release 2001 2 0 is September 2001 second release Within the Code Point with polygons product the Code Point data and the polygons will have their own version numbering based on the same principles as above for example Code Point with polygons Vs 2001 1 0 will contain a set of Code Point Vs 2000 2 0 and a set of polygons Vs 2001 1 0 Product development Code Point with polygons is a new product designed to meet the requirements of users as expressed through market consultation exercises It is envisaged that the product will evolve to some extent as users become familiar with it and refine their views Code Point with polygons product structure On the product CD ROM s the root directory contains two folders nfo and Data The nfo folder contains the following files e Readfirst a file summarising copyright and licensing information that must be read and understood before any data files are opened e CD in
17. rong side of an address the unit postcode boundaries are constrained to motorways railways rivers and canals A roads and B roads in that order of priority Each polygon is assigned a unique identifier The identifier will be a 16 digit series These identifiers are not reused should a polygon be deleted The polygon dataset contains non overlapping polygon coverage of Great Britain constrained by the extent of realm coastline from Ordnance Survey s Boundary Line data Should any addresses fall outside the coastline they will be included in the discards file There are no polygons or areas enclosed by polygons without a postcode allocated or overlaps in the polygons The dataset is accompanied by a read me file that provides information regarding the currency of the data used including the date of the version of ADDRESS POINT and the PAF release therein and other Ordnance Survey datasets used and the date of the Royal Mail sector boundaries produced in association with GEOPLAN that have been used The data is divided into 120 postcode area files each file named with a one or two letter postcode area code Where two or more postcodes are associated with a single building seed a single distinctive square polygon will represent all the postcodes attached to the seed These polygons have a special series of identifiers all commencing with the letter V A separate look up table lists the postcodes and their 16 digit unique identifier
18. rrect unit postcode boundary a postcode unit only being the delivery point or collection of delivery points that constitute the unit postcode The boundary is therefore a notional one the position of which is arbitrary What has been created however is a set of boundaries that follow a consistent logic and portray the notional footprint of each postcode unit enclosing every delivery address for which positional data of sufficient quality is available and following the major physical features that could reasonably be regarded as part of the postcode boundary The polygons are thus of particularly high quality in that every address provided its match in ADDRESS POINT is of sufficient status will be shown in the correct postcode polygon Equally the polygons will only contain the addresses appropriate to the postcode represented This high quality standard allows the polygons to be used for a wider range of applications than the products previously available This will include analysis of geographically based information or statistics by postcode and the pictorial display of information that has been analysed or sorted by postcode The polygons are supplied with the Code Point dataset which provides a complementary set of point references for each postcode The two datasets will both be created from the same edition of ADDRESS POINT ensuring that their data is synchronous What you need to use Code Point with polygons Hardware To operat
19. stcodes in each postcode sector district and area Unit postcode polygons describing notional boundaries around the approximately 1 7 million unit postcodes in Great Britain This data is supplied in either E00 or MID MIF formats e Also provided in association with the polygon data are three CSV text files e Vertical Streets a list of polygons identified by a serial number that is prefixed by the letter V that contain more than one postcode This situation can occur in for example blocks of flats where there is more than one postcode within a single building e PO boxes a list of the PO box postcodes none of which will have been used in the creation of the polygon set e Discards a list of the postcodes for which polygons have not been included because there is no data of sufficient quality to use in the polygon creation or because their constituent addresses lie outside the extent of realm coastline e A text file named Readfirst that contains important information regarding copyright and so on another called CD Info that contains information regarding the structure and content of the CD and a third called user guide that contains the current user guide for the product Completeness The Code Point product contains a point reference for every unit postcode in England Scotland and Wales that is contained in Royal Mail s PAF product The polygon set contains a polygon for every postcode in England Scotland and W
20. that are represented by each special polygon Where these distinctive polygons are crowded closely together they are reduced in size to prevent overlaps hiding some of the polygons Example showing two vertical streets and on the right an extract from the Vertical Streets look up table oTr ZOO i cou coz 0172 oe sos34Tn vs000536 801726 0172 vs000540 Z i i D 80172Ez 50143A vso00544 _ P E a 30140SZ SO00550 Le Chapter 4 Quality statement specification Lineage To the PAF address records for Great Britain Ordnance Survey add National Grid coordinates mainly to 0 1 m resolution and other information to produce the product called ADDRESS POINT This unique product thereby provides highly accurate positioning of all postal addresses in Great Britain ADDRESS POINT is then used to create both Code Point and the Code Point unit postcode polygons Content Code Point with polygons contains Code Point georeferenced unit postcode data with associated metadata such as address counts and quality indicators Also provided are the health and administrative area codes related to each postcode The coverage of this data is the whole of the United Kingdom and it is provided in both CSV and NTF formats e Also provided in association with the Code Point data is a text file that provides the full text equivalents of the administrative area codes and another that provides the numbers of unit po
21. this user guide This guide concentrates on the polygons that are provided in the product For information regarding the Code Point data reference should be made to the previously published Code Point user guide The polygon dataset provides e Aset of 120 ASCII transfer files that when viewed using appropriate geographical information system GIS software provide a set of boundaries for the postcode units in Great Britain Where possible these boundaries are nested within GEOPLAN postcode sector boundaries and constrained to geographical features such as roads railways and rivers e Text files containing Vertical Streets PO boxes Discards e Further associated data metadata and information files Chapter 2 Data overview Overview of Code Point with polygons Basic principles The Code Point polygons are derived from ADDRESS POINT the Ordnance Survey dataset that provides National Grid reference NG ref coordinates for each postal delivery address in Great Britain The Thiessen process tessellates these points then the address boundaries inside each postcode are dissolved away leaving boundaries for the postcode units The polygons are then additionally refined by clipping them where appropriate to major roads railways rivers and so on and to the postcode sector boundaries produced by Royal Mail in association with GEOPLAN a division of Yellow Marketing Information Ltd There is actually no such thing as a co
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