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854 Kb PDF: Boundary-Line user guide version 5.1

1. 52 Volume Header Record VOLHDREC 01 53 Database Header Record DBHREC 02 eene 54 Feature Classification Record 55 05 sse 55 Section Header Record 07 55 Attribute Record ATTREC 14 for Line Record LINEREC 23 57 Attribute Record ATTREC 14 for Collection of Features Record COLLECT 34 58 Attribute Record ATTREC 14 for Polygon Record POLYGON 31 and Complex Polygon Record CPOLY 39 1 5 iecit ee A 60 Geometry Record 1121 61 Line Record 23 atado cnet 61 Chain Record CHAIN 24 EET KR EEA 62 Polygon Record POLY GON 91 repose Recuerde 62 Complex Polygon Record 33 63 Collection of Features Record COLLECT 34 64 Attribute Description Record ATTDESC 40 65 Code List Record CODELIST 42 iis eene pna ha en uu 66 Volume Termination Record VOLTERM 99 sse 67 68 v1 0 04 2007 Boundary Line technical specification 0 v1 0 04 2007 Crown copyright Page 31 of 75 Introduction Purp
2. 9 Overview of Boundary Line erret rrr tte er rt 10 BEIC ML 10 Basic priliciples ect tetro tct vedete Seb v eter un dev da eU bete i de unda 10 BoundarysLine data SOUICO e en dtr de den Rte bu deuda 10 Complex polygors recie terea 10 Feature tet eccle debe veri tb co e dede bee 11 Feature 11 Feature attribute 12 Area CODES m 12 Other attributes m 12 Unique identifiers for administrative unit link and 12 at dean 12 Boundary Line 13 Relationships of administrative 13 Boundary Line principles and features 17 Administrative 17 Area 17 SEEE Ep PEE 18 Ceremonial counties isise diniinan eet n ea aaia aa aa 18 Bier 18 ca EE 18 ien risen
3. 38 Coordinate 38 Shapefile table structures 39 Example field record for shapefile County 39 Example field record for shapefile Mean high 39 File names for layered 1 40 Directory names for nested 40 Chapter 4 ec 41 An overview of Boundary Line in 41 Conventions used in this technical 41 Version managelment Ln aga Rue ca Pea caue 42 Product pm 42 Product release reb 42 NTF nike 42 Specific Boundary Line NTF 42 Area dees ke eet e i a e 42 42 LINK features 42 PEDI aaea 43 Boundary Line technical specification 0 v1 0 04 2007 Crown copyright Page 30 of 75 Chapter 5 Annexe A Census agency codes enne ein 43 Record 2 RE 43
4. 01 VOLUME HEADER RECORD 01 02 DATABASE HEADER RECORD 40 ATTRIBUTE DESCRIPTION RECORD FEATURE CLASSIFICATION 05 RECORD 07 SECTION HEADER RECORD File 1 data 99 VOLUME TERMINATION RECORD 01 VOLUME HEADER RECORD 01 02 DATABASE HEADER RECORD 40 ATTRIBUTE DESCRIPTION RECORD FEATURE CLASSIFICATION 05 RECORD 07 SECTION HEADER RECORD File 2 data 99 VOLUME TERMINATION RECORD and so on File n data 99 VOLUME TERMINATION RECORD 99End Of Transfer Set0 2222 Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 51 of 75 Chapter 5 Record structures for the transfer of Boundary Line in NTF NTF record list This list comprises the valid record types used in the Boundary Line NTF transfer set Descriptor Description Record name 01 Volume Header Record defines the donor and data type VOLHDREC 02 Database Header Record transfers data about the database DBHREC 05 Feature Classification Record defines data classifications FEATCLASS 07 Section Header Record coordinate and structure types unit scale factors SECHREC and so on 14 Attribute Record defines the attributes for link name and polygon records ATTREC 21 Two dimensional Geometry Record defines the two dimensional geometry GEOMETRY 1 for a link 23 Line Record defines all of the line information This is included for LINEREC compatibility with other products
5. Template NOTE LINE ID GEOM ID and ID are the same variable number 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 61 of 75 Chain Record CHAIN 24 Field Position REC DESC 01 02 CHAIN ID 03 08 NUM PARTS 09 12 GEOM ID 13 18 DIR 19 19 CONT MARK EOR i variable integer Record examples Format Content A2 24 l6 Variable number 14 Variable number l6 Variable number I1 1 or 2 I1 0 or 1 A1 96 Description Record descriptor Unique in file ID of Chain Cross reference to CHAIN ID in Polygon Record Number of links for polygon within file 10 and DIR iterate this number of times Cross reference to 10 in Geometry Record for link Direction start to end or direction end to start No further records or continuation record follows Record terminator 2400007300120000321000012100001110000101000009100003110000591000064100006311 000000621000060100006110 Ses eem ears esee m em 8 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE Continuation record s CONTREC commence with the record descriptor 00 Polygon Record POLYGON 31 Field Position REC DESC 01 02 POLY ID 03 08 CHAIN ID 09 14 GEOM ID 15 20 NUM ATT 21 22 ATT ID 23 28 CONT MARK 29 29 EOR 30 30 Record example 31800
6. 18 Exception areas pP ET 19 pleine nde 20 National boundaries etsi notet RE aaa aeaa ER FER UN 21 CENSUS AGENCY CODES te apr ceo Eu e Enea ceat ep E deep es 21 UtnsannmeXed areas co 22 Unitary authoritles tior pe ti e Ete ya vei ples pe eti adde detta 22 The coastline and associated 22 Extentiof the realm EOR eee ee eere cuire araia ee dae ee 22 ee IDE UL UIN UID 23 Islands and rocks inthe Sea e nete ur ke 23 Mean high water springs erecti t eni e pl 24 Mean low water Springs eiciia i rere beer tke tih eee E 24 Boundary Line user guide contents v1 0 04 2007 Crown copyright Page 2 of 75 Annexe A Annexe B pl PER P MEER A 24 xj 24 Seaward 0 5 enne nennen enne nennen nnns 24 Structures in the 2200 enne nennen enne nnne eis 25 Change update Statutory Instruments SI and non SI changes in 2007 Boundary Line release eiii eet ich us CR RR RC 26 4495112 Me 26 Wale a 27 SCOUANG 27 Product and service performance re
7. Pec ccr EET 12345678901234567890123456789012345678901234567890123456789012345678901234567890 99End Of Transfer Set1 cote lese 9322 2 e B 22 e2969 8 9 Y 228 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template 00 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 67 of 75 AnnexeA Glossary absolute coordinates A coordinate pair or triplet measured directly from the origin of the coordinate system in which it lies and not to any other point in the system 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 blanket term used by Ordnance Survey to refer to all public administrative areas specifically local government management and electoral areas administrative unit A single administrative area alphanumeric Information in character form American Standard Code for Information Interchange ASCII A T bit code for encoding a standard character set 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 no
8. The code for a county consists of the first two characters followed by four spaces Example code for a county 13 Cheshire The code for a district consists of the first four characters followed by two spaces Example code for a typical district 13UB 13 Cheshire county and UB Chester district In two tier local government hierarchy areas the format of the codes is four letters followed by two spaces where the first two letters represent the unitary authority and the second two the ward Example code for a sample ward in a unitary authority ETMA ET Halton and MA Halton Brook ward The code for a unitary authority area consists of the first two characters followed by four spaces Example code for a unitary authority NJ Sir y Fflint Flintshire Any OP code is set at 999999 when the information is not available to Ordnance Survey The code is blank when the administrative unit does not have a code The Isles of Scilly have a unitary council but is considered as a district of the county of Cornwall and the Isles of Scilly for ONS coding purposes Operative dates This is a calendar date given in an Order Act or Statutory Instrument on which the specified boundary changes will come into operation Dates given may be up to four years after the publication of the Order Act or Statutory Instrument and may apply to any type of boundary other than parliamentary or European regions Each release of Boundary Line r
9. 24 Chain Record data about links forming polygons CHAIN 31 Polygon Record data about polygons POLYGON 33 Complex Polygon Record data about complex polygons CPOLY 34 Collection of Features Record data on how polygons and collections are COLLECT associated 40 Attribute Description Record defines attribute descriptions and their fields ATTDESC 42 Code List Record describes the coded values that appear in attribute fields CODELIST 99 Volume Termination Record defines the end of the transfer set VOLTERM Complex Polygon Record CPOLY are only included to deal with polygons with holes as described chapter 2 of the user guide Overview of Boundary Line otherwise all records are compulsory for all transfers NENNEN Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 52 of 75 Volume Header Record VOLHDREC 01 Field REC DESC DONOR RECIPIENT TRANDATE SERIAL VOLNUM NTFLEVEL NTFVER NTFOR EOR DIVIDER CONT MARK EOR Record example Position 01 02 03 22 23 42 43 50 51 54 55 56 57 57 58 61 62 62 63 63 64 64 65 65 66 66 O1ORDNANCE SURVEY Mp Format A2 A20 A20 D8 A1 I1 A1 3 Content 01 ORDNANCE SURVEY lt 5S gt lt 20S gt 20040219 0000 See note 1 below 3 0200 V 96 or S Description Record descriptor Supplier Not used Date of creation of the trans
10. Relative limits of file in metres see note 1 below Relative limits of file in metres see note 1 below Relative limits of file in metres see note 1 below Relative limits of file in metres see note 1 below Not used Not used Date of the annual snapshot of boundaries represented by the annual product release Not used Copyright date for the annual product release No further records Record terminator O7CHESHIRE C21000082000000010000000000000010000000000000000000000000000000001 00000032487900003389940000401780000038792900000000002000050400000000200005040 ap EREMO res ec ues rS ERROR PEE 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE 1 YMIN XMAX and YMAX values are calculated from a geometric square enclosing the delivery set In some cases this may mean that XMIN has a negative value Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 56 of 75 Attribute Record ATTREC 14 for Line Record LINEREC 23 Field Position Format Content Description REC_DESC 01 02 A2 14 Record descriptor ATT_ID 03 08 l6 Variable number Unique ID in file Cross reference to ATT ID in Geometry record VAL TYPE 09 10 A2 LK Mnemonic for GLOBAL LINK ID attribute VALUE 11 20 110 See note 1 Unique identifier for link VAL TYPE 21 22 A2 FC see note 3 below Mnemonic for FEAT CODE attribute optional
11. This means that the extent of realm will be e the mean low water mark mean low water springs in Scotland except when landward of a seaward extension or as shown below in Figure 3 5a and indicated as Point B e the mean high water mark mean high water springs in Scotland where coincident with mean low water or mean low water springs but not when landward of a seaward extension or Point B e Point B and e seaward extensions 0 00 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 22 of 75 Figure 3 5a Treatment of boundaries in estuaries Figure 3 5b Treatment of estuaries in Boundary Line Normal Tidal Limit NTL Sea Key N 1 pus RR esr un EOR MHW Boundary This figure shows how the features depicted in figure 3 5a are represented in Boundary Line t om oO og 5 c aD 70 Bt Level of sea at low water LWL Cross section Level of the sea at high water 1 Level of the sea at low water In this figure the extent of the realm EOR follows mean low water crossing the estuaries at LWL Foreshore The foreshore is taken to be the area of land between mean high water springs mark and the extent of the realm which will include e tidal water within a seaward extension and e tidal water above Point B Figure 3 5a to the normal tidal limit NTL together with the area between mean high water
12. 0 20 8996 7001 NOTE Full details of the British Standard can be accessed through the British Standards Institution s web site at www bsi global com Conventions used in this technical specification Certain conventions are adopted as an aid to interpretation In some cases the convention is dropped where the context is self evident Square brackets are placed around record names for example VOLHDREC Curly brackets denote field names for example REC is the Record Descriptor field 190 A two digit number following square brackets denotes the Record Descriptor which uniquely identifies the record name between the brackets lt S gt This represents the space character ASCII code 32 lt 3S gt This denotes three successive space characters This is the percentage character ASCII code 37 222222 Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 41 of 75 Version management Product version Each version of Boundary Line is defined by a unique product specification The product specification can be found in Boundary Line data in the field of the Database Header Record DBHREC This Technical Sheet reflects the product specifications current at the time of its production which are as follows Product Boundary Line Product specification A20N FC Product version date May 2006 Product version BL2006 v1 The FCDATE field of the Databas
13. 01 02 03 12 13 13 14 14 15 19 20 20 21 30 31 35 36 36 37 46 47 56 57 66 67 76 77 77 78 78 Format A2 A10 Content 07 Admin name 00008 2 0000000100 00000 0 0000001000 Coordinates Coordinates 0000000000 1 96 Template Description Record descriptor Unique identifier of the main administration Defines rectangular coordinates followed by spaces Defines vector data Refines X COORD and Y COORD to 8 digits Defines units as metres Multiplies coordinates by 0 100 Not used Not used Multiplies coordinates by 0 100 Eastings of file origin always 0 Northings of file origin always O Not used Continuation record follows Record terminator NOTE 1 The SECT REF field will comprise the first 10 characters of the main administration Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 55 of 75 Continuation record Field REC DESC XMIN YMIN XMAX YMAX XY ACC Z ACC SURV DATE LAST AMND COPYRIGHT CONT MARK EOR Position 01 02 03 12 13 22 23 32 33 42 43 47 48 52 53 60 61 68 69 76 77 77 78 78 Record examples Format A2 110 110 110 110 R5 2 R5 2 D8 D8 D8 Content 00 The smallest X value in file The smallest Y value in file The largest X value in file The largest Y value in file 00000 00000 YYYYMMDD 00000000 YYYYMMDD Description Record descriptor
14. An expression of the up to dateness of data data A representation of facts concepts or instructions in a formalised manner suitable for communication interpretation or processing database An organised integrated collection of data stored so as to be capable of use in relevant applications with the data being accessed by different logical paths Theoretically it is application independent but in practice rarely so d 0 00 Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 69 of 75 database NTF A group of one or more sections with common characteristics defined in a data dictionary Information and data being transferred in a transfer set is deemed to belong to one or more databases These may be databases in the literal sense or may be collections of data from a common source such as a national coverage of large scale mapping data capture The encoding of data In the context of digital mapping this includes map digitising direct recording by electronic survey instruments and the encoding of text and attributes by whatever means 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 which incorporates only those properties thought to be relevant to the application or applications at hand The data model would normally define specific group
15. Welsh Assembly electoral region WAE AA Greater London Authority Assembly LAC VA Westminster constituency WMC VA constituency London borough London borough ward LBW Scotland Metropolitan county MTC AA Description AC TY Metropolitan district MTD European region EUR VA Metropolitan district ward MTW VA Scottish Parliament constituency SPC VA Non civil parish or community NCP FA Scottish Parliament electoral region SPE AA Unitary authority Unitary authority authority electoral division UTE Unitary authority ward UTW Unitary authority ward UTW Unitary authority electoral division UTE VA Westminster constituency WMC VA Westminster constituency WMC VA NOTE 7 Punctuation is shown in names but not accentuation for example the name Westward Ho Ward includes the exclamation mark but Ynys M n is shown as Ynys Mon 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 59 of 75 Attribute Record ATTREC 14 for Polygon Record POLYGON 31 and Complex Polygon Record CPOLY 33 Field Position Format Content Description REC_DESC 01 02 A2 14 Record descriptor ATT_ID 03 08 l6 Variable number Unique in the file Cross reference to ATT ID in Polygon Record or Complex Polygon Record VAL TYPE 09 10 A2 PI Mnemonic for GLOBAL POLYGON VALUE 11 16 l6 See note 1 below Unique in dataset ID for polygon VAL TYPE 17 1
16. A specific NTF term for the data together with its supporting information which the customer receives 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 volume A physical unit of the transfer medium that is a single disk a single cartridge or a single tape Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 75 of 75
17. COLL 10 to its related London borough wards For each Scottish parliamentary electoral region named in the file the following will appear in COLLECT COLL 10 to its related Scottish parliamentary constituencies For each Welsh Assembly electoral region named in the file the following will appear in the COLLECT record COLL 10 to its related Welsh Assembly constituencies For each European region named in the file the following will appear in the COLLECT record None there is currently no administrative voting level below European region For each Westminster constituency named in the file the following will appear in the COLLECT record None there is currently no administrative voting level below Westminster constituency Transfer set structure Boundary Line data is in one or more transfer sets A transfer set equates to a single file Volume records Each transfer set starts with a Volume Header Record VOLHDREC and terminates with a Volume Termination Record VOLTERM Database records The beginning of each transfer set is structured with the following introductory or leading records 1 Database Header Record DBHREC which gives details of e the database name e NTF release date e feature classification table name and e the release date which applies to the whole of the transfer set Attribute Description Record ATTDESC which lists and gives a description of the attributes that can
18. ID Double NUMBERO Double POLYGON ID Double UNIT ID Double CODE Text HECTARES Double AREA Double TYPE CODE Text DESCRIPTO Text TYPE CODO Text DESCRIPT1 Text NOTE These fields are not in the data as they are virtual columns created by ArcGIS when accessing the table contents The FID column uniquely identifies each object stored in the table The SHAPE column provides information about the feature geometry Example field record for shapefile County FID 248 SHAPE Polygon NAME Bedfordshire County AREA_CODE CTY DESCRIPTO County FILE NAME BEDFORDSHIRE COUNTY NUMBER 17 NUMBERO 476 POLYGON ID 40935 UNIT ID 1158 CODE 09 HECTARES 119207 686 AREA 0 TYPE CODE AA DESCRIPTO CIVIL ADMINISTRATION AREA TYPE CODO DESCRIPT1 Example field record for shapefile Mean high water FID 0 SHAPE Polyline CODE 0071 DESCRIPTO High FILE NAME CHESHIRE COUNTY NUMBER 1348 LINK ID 60283 NOTE These fields are not in the data as they are virtual columns created by ArcGIS when accessing the table contents The FID column uniquely identifies each object stored in the table The SHAPE column provides information about the feature geometry 0 0 Boundary Line technical specification chapter 3 v1 0 04 2007 Crown copyright Page 39 of 75 File names for layered shapefile England Scotland Wales County region Inc GLAs district borough unitary region district borough unitary region county electoral divisio
19. Point B This is the intangible line across a channel where the level of the river meets the level of the sea at low water Within large channels or estuaries Point B is defined on the source documents for Boundary Line and is therefore shown as EOR In small channels Point B is not shown on the source documents so is assumed to be along the general line of low water and is shown as EOR Seaward extensions These are artificial extensions to the realm that have been made by Act of Parliament They extend the local government and parliamentary areas seaward of mean low water springs mark 0 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 24 of 75 Figure 3 6 A seaward extension WOODINGDEAN WARD MARINE WARD ROTTINGDEAN WARD Structures in the sea Breakwaters are structures of wood stone metal or other material built to break the force of waves They can be separate from or joined to the mainland If joined they are generally included in the local government and parliamentary areas If separate they are not part of the local government and parliamentary area unless they are placed therein by legislation of some kind for example Plymouth breakwater is included in the local government area whilst the centre portion of the Portland Harbour breakwater is not Permanent or solid structures in the sea such as the forts in the Solent off Portsmouth Harbour and Brighton Mari
20. Polygon Record CPOLY do not have any geometry or attributes but the containing polygon is held explicitly Data classification and metadata Attribute codes Attribute codes provide supplementary information on a feature providing such qualifying information as feature code feature name and so on See also Other attributes in chapter 2 Overview of Boundary Line of the user guide The structure of the attributes is described in the Attribute Description Record ATTDESC The Attribute Record ATTREC holds the attribute detail of a record The following attributes are used in the supply of Boundary Line data Mnemonic Name Description ADMIN AREA ID Unique identifier for administrative unit AC AREA CODE Coded value for the area FC FEAT CODE Feature code for selected links HA HECTARES Area of polygon within file LK GLOBAL LINK ID Unique identifier for a link NA NON INLAND AREA Area of non inland within an administrative area NM NAME Distinctive name of administrative unit NB NON TYPE CODE Coded value of matching non area OP CENSUS CODE Code allocated by ONS or GROS to administrative unit PI GLOBAL POLYGON ID Unique identifier for a polygon TY AREA TYPE Value indicating the type of administrative unit or area A Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 45 of 75 ADMIN AREA ID This attribute is conveyed in the Attribute Record for collection of features
21. See table below Field width FINTER 08 12 A5 See table below Attribute format ATT NAME 13 A See table below Attribute name See note 1 below DIVIDER Ex A1 Divider used to terminate variable length text fields CONT MARK s I1 0 No further records EOR TT A1 96 Record terminator Contents of ATTDESC VAL TYPE FWIDTH FINTER ATT NAME Al 006 16 ADMIN AREA ID FC 004 l4 FEAT CODE LK 010 110 GLOBAL LINK ID NM 38 A NAME see note 1 below OP 007 AT CENSUS CODE PI 006 16 GLOBAL POLYGON ID HA 012 R12 3 HECTARES AC 003 A3 AREA CODE NA 012 R12 3 NON INLAND AREA NB 003 A3 NON TYPE CODE TY 002 A2 AREA TYPE variable integer NOTE 1 Punctuation is shown in names but not accentuation for example the name Westward Ho Ward includes the exclamation mark but Ynys M n is shown as Ynys Mon Record examples 401 010110 GLOBAL LINK 0 40AIO0616 ADMIN AREA ID 0 402100616 GLOBAL POLYGON 0 40NAO012R12 3NON INLAND 0 40HA012R12 3HECTARESVO 40NM NAMEVOS 400P006A7 CENSUS 0 40 00242 AREA 0 40 00414 FEAT CODE 0 40ACO03A3 AREA CODE 0 40NB003A3 TYPE CODE 0 i deen Leis ERES etel laered eas e aO Rer 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 65 of 75 Code List Rec
22. and is a unique identifier for each administrative unit Each AI attribute is unique to the entire Boundary Line dataset and is retained through successive updates AC AREA CODE A code allocated by the Ordnance Survey to indicate the administrative or voting area type This is allocated to all administrative or voting areas The current values are given below and also include codes for future areas NOTE This list should be treated as dynamic as other types of boundaries may be added in the future Name Code Civil parish or community CPC County CTY County electoral division CED District DIS District ward DIW European region EUR Greater London Authority GLA Greater London Authority Assembly constituency LAC London borough LBO London borough ward LBW Metropolitan county MTC Metropolitan district MTD Metropolitan district ward MTW Nation NAT Non civil parish or community NCP Realm RLM Scottish Parliament constituency SPC Scottish Parliament electoral region SPE Sea SEA Unitary authority UTA Unitary authority ward UTW Unitary authority electoral division UTE Welsh Assembly constituency WAC Welsh Assembly electoral region WAE Westminster constituency WMC FC FEAT CODE The use of feature codes is reduced significantly With this specification they will only be used to define non standard link features The mean high water tide lines will have the code 0071 The CD TY attributes together with the COLLECT list will take over fro
23. be applied to features within the transfer set Feature Classification Record FEATCLASS which gives the MHW feature code Code List Record CODELIST which lists and describes the coded values that appear in the attribute records AC NB and TY These introductory records are followed by the data Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 48 of 75 Section records The section consists of two parts 1 Section Header Record SECHREC this gives the National Grid coordinates of the section and 2 section body this comprises all the features within the section Section body data Line feature Each line feature is represented by the use of the following records e Line Record LINE Geometry Record IGEOMETRY1 and e Attribute Record ATTREC Chain feature Each chain feature is represented by the use of the following records Chain Record CHAIN Geometry Record IGEOMETRY1 and e Attribute Record ATTREC Each chain feature is in the data only once One to many geometry records represent one chain record There is one attribute record to each geometry record Polygon feature Each polygon feature is represented by the use of the following records Polygon Record POLYGON Chain Record CHAIN and e Attribute Record ATTREC Each polygon feature is in the data only once One polygon record represents one chain record There is one attrib
24. collect for admin area or voting area relationships Cross reference to POLY ID of Polygon Record or CPOLY ID of Complex Polygon Record or the COLL ID of Collect Record The number of attribute identifiers which follow Cross reference to ID of Attribute Record for collection of features No further records or continuation record follows Record terminator 34002973005531001925340029723400297134002970340029693400296834002967340029661 003400296534002964340029633400288934002888340028673400286634002865340028641 003400286334002713340027123400271134002710340027093400270834002707340027061 003400270534002704340027033400270234002701340027003400269934002698340026011 003400260034002599340025983400259734002596340025953400250534002504340025031 003400250234002501340025003400249934002455340024543400245334002452340024511 003400245034002449010029730 5522255 NEP ER 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE Continuation record s CONTREC commence with the record descriptor 00 00 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 64 of 75 Attribute Description Record ATTDESC 40 Field Position Format Content Description REC_DESC 01 02 A2 40 Record descriptor VAL_TYPE 03 04 A2 See table below Attribute mnemonic FWIDTH 05 07 A3
25. grouping of Welsh Assembly constituencies Great Britain is divided into European regions Scotland Wales and nine English regions for voting purposes to elect members MEPs to the European parliament England Scotland and Wales are divided into parliamentary constituencies for voting purposes to elect members MPs to the Westminster parliament Parliamentary constituencies are made up of combinations of Wards or Electoral Divisions in Wales Boundary Line data is output in two structures e Nested The data is supplied by named files all the named files include all of the other sub levels of electoral boundaries that belong under that high level administration for example County file will have the named county district district ward civil parish county ED contained within Unitary authorities will have named unitary authority unitary authority ward or unitary authority ED as appropriate civil parish where appropriate together with community in Wales The nested structure is available in NTF ESRI Shapefile and MapInfo MID MIF e Layered This is a simplified file structure supplying the boundaries as individual files for example County file contains only counties and unitary authorities file contains just unitary authorities The layered structure is only available in ESRI Shapefile and MapInfo MID MIF 0 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 13 o
26. named files made up of 35 county files e 100 unitary authority files e 628 Westminster constituency files e 11 European region files e 36 metropolitan district files 1 Greater London Authority file e 8 Scottish parliamentary electoral region files and e 5 Welsh Assembly electoral region files e The dataset for England has 656 named files made up of 35 county files 46 unitary files 529 Westminster constituency files 9 European region files 36 metropolitan district files and e 1 Greater London Authority file e The dataset for Wales has 68 named files made up of 22 unitary authority files 40 Westminster constituency files e 1 European region file and e 5 Welsh Assembly electoral region files these include the Welsh Parliamentary files e The dataset for Scotland has named files made up of e 32unitary authority files e 59 Westminster constituency files e 1 European region file and e 8 Scottish parliamentary electoral region files these include the Scottish Parliamentary files As a consequence of the named file supply all coordinates in the supplied data file are full Ordnance Survey National Grid coordinates as there is no concept of local origin Requirements to utilise Boundary Line Hardware Provided that sufficient memory storage facilities and a suitable software viewer application see below are available there are no constraints on the hardware platforms
27. springs mark and the edge of the channel at mean low water springs Mean high water springs mark is represented in Boundary Line by a continuous link feature with feature code 0071 Mean low water springs mark is not shown although it is generally coincident with the EOR The area of non inland is referenced within each administrative unit using the NA attribute Islands and rocks in the sea The following rules govern the representation in Boundary Line of offshore islands and rocks in the sea Offshore rocks and islands will be shown if 0 4 hectares or more in area at high tide e offshore islands with buildings will always be shown irrespective of size Offshore islands or rocks will not be shown if they are beyond the defined extent of the realm irrespective of size or e covered at high tide If an offshore island or rock is shown it will be contained within all the relevant administrative unit collections 00 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 23 of 75 Mean high water springs The mean high water springs mark is shown to NTL Areas of salt marsh mud flats and so on often have very complicated tide lines For ease of digitising and to reduce data volumes mean high water may be generalised in these areas not Scotland Mean high water springs mark is represented in Boundary Line by a continuous link feature with feature code 0071 Mean hi
28. status report within 21 working days If you are posting this form please send it to Boundary Line 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 0 0 Boundary Line user guide annexe v1 0 04 2007 Crown copyright Page 29 of 75 Boundary Line Technical specification Contents Section Page no introductio seen enka bec 32 Purpose of this specification and 32 Copyright imn this Speci CatiON 32 Using the technical enne 32 What you need to use 2 32 HardWare MMC 32 HH 32 Chapter 1 Product contents 33 Source of Bourndary Liltie aid eder ee nee 33 ETE 33 Superseded 33 Census agency codes aede AM Ais tise A se ee VE Le RR ie 33 Tide lines and ui nels ketal eh aed dd ne dedi 33 Bein PE
29. that can be used The range of hardware that can typically be used varies from higher specification personal computers PCs to mainframe computers Software Boundary Line is inert data and does not include software for data manipulation To fully exploit Boundary Line itis necessary to use appropriate application software There are many proprietary systems available and Ordnance Survey publishes a list of GIS computer aided design CAD and digital mapping system suppliers who have independently confirmed their software can import Ordnance Survey NTF format data E NEN Boundary Line user guide chapter 1 v1 0 04 2007 Crown copyright Page 8 of 75 Transfer formats Boundary Line is created in BS 7567 NTF v2 0 Level 3 ESRI Shapefile MID MIF Media Boundary Line is supplied on CD ROM Update Boundary Line is now updated twice a year spring and autumn allowing a choice in which update is preferred The spring update represents boundaries as defined and modified by Orders Acts and Statutory Instruments at the date of the May local elections The autumn update also represents boundaries at the date of the May local elections and is operative from the previous spring May to autumn October release Each update is accompanied by details of all changes C Boundary Line user guide chapter 1 v1 0 04 2007 Crown copyright Page 9 of 75 Chapter2 Overview of Boundary Line Data overview B
30. 007 2006 377 Ward Order STIRLING 03 May 2007 2006 376 Ward Order WEST DUNBARTONSHIRE 03 May 2007 2006 547 Ward Order WEST LOTHIAN 03 May 2007 2006 535 Ward Order Changes not incorporated into the May 2007 Boundary Line update Residual Statutory Instruments SIs and non Sls Boundaries D District U A Unitary County os Op Date SI Yr SI No Comments Borough Met Dist Metropolitan District BEDFORDSHIRE BEDFORD 01 April 2007 2007 334 Parish Order BUCKINGHAMSHIRE AYLESBURY VALE 01 April 2007 2007 335 Parish Order HAMPSHIRE TEST VALLEY 01 April 2007 2007 336 Parish Order LANCASHIRE WEST LANCASHIRE 01 April 2007 2007 406 Parish Order WARWICKSHIRE WARWICK 01 April 2007 2007 656 Parish Order STOCKTON ON TEES 01 April 2007 2007 403 Parish Order BUCKINGHAMSHIRE AYLESBURY VALE 03 2007 2007 480 Ward Order BUCKINGHAMSHIRE SOUTH BUCKS 03 2007 2006 329 Ward Order BUCKINGHAMSHIRE CHILTERN 03 2007 2006 363 Ward Order DEVON NORTH DEVON 03 May 2007 2006 484 Ward Order EAST SUSSEX WEALDEN 03 May 2007 2007 488 Ward Order GLOUCESTERSHIRE COTSWOLD 03 2007 2007 150 Ward Order HERTFORDSHIRE ST ALBANS 03 May 2007 2007 328 Ward Order LANCASHIRE PRESTON 03 2007 2007 326 Ward Order LANCASHIRE WEST LANCASHIRE 03 May 2007 2007 489 Ward Order NORFOLK SO
31. 3 May 2007 2006 537 Ward Order CLACKMANNANSHIRE 03 May 2007 2006 472 Ward Order DUMFRIES AND GALLOWAY 03 May 2007 2006 434 Ward Order DUNDEE CITY 03 May 2007 2006 375 Ward Order EAST AYRSHIRE 03 May 2007 2006 428 Ward Order EAST DUNBARTONSHIRE 03 2007 2006 374 Ward Order EAST LOTHIAN 03 May 2007 2006 359 Ward Order EAST RENFREWSHIRE 03 May 2007 2006 391 Ward Order FALKIRK 03 May 2007 2006 392 Ward Order 03 2007 2006 510 Ward Order GLASGOW CITY 03 May 2007 2006 546 Ward Order HIGHLAND 03 May 2007 2006 481 Ward Order INVERCLYDE 03 May 2007 2006 373 Ward Order MIDLOTHIAN 03 May 2007 2006 460 Ward Order MORAY 03 May 2007 2006 372 Ward Order NA H EILEANAN AN IAR 03 May 2007 2006 558 Ward Order NORTH AYRSHIRE 03 May 2007 2006 427 Ward Order NORTH LANARKSHIRE 03 May 2007 2006 532 Ward Order ORKNEY ISLANDS 03 May 2007 2006 394 Ward Order PERTH AND KINROSS 03 May 2007 2006 370 Ward Order RENFREWSHIRE 03 May 2007 2006 551 Ward Order SCOTTISH BORDERS 03 May 2007 2006 533 Ward Order SHETLAND ISLANDS 03 May 2007 2006 562 Ward Order SOUTH AYRSHIRE 03 May 2007 2006 429 Ward Order Boundary Line user guide annexe v1 0 04 2007 Crown copyright Page 27 of 75 U A Unitary Authority Op Date SI Yr SINo Comments SOUTH LANARKSHIRE 03 May 2
32. 33 Send It T 33 Boundary Line data properties esses eene nennen 34 Boundary Line data structure cette ep teat boca ee ever bnc nord 34 Boundary Line output resolution recenset eet reuera kh atre e E nte Fu ce 34 Chapter 2 Mapintfo MID MIF 5 oerte pore PER arn psp e kB oro ere Eee Fine Dod dpa NX 35 An overview of Boundary Line in MapInfo MID MIE ccce 35 Structure of Boundary Line in eene 35 Aroa Teate E 35 LINKTEATUFES MAW 35 Coordinate SySteltm codo terr 35 MID MIF table Structures tee vd 36 Example of a MID file record 36 Example of a MIF file header 36 Example of a MIF file header Mean high 36 Example of a MID file record Mean high 37 File names for layered nennen nnns 37 Directory names for nested MID MIF essssssseseeeeeeneeneeenen nennen 37 Chapter 3 ESRI shapefile CLE 38 An overview of Boundary Line in ESRI 38 Structure of Boundary Line in 38 gt 2 2 2 a 38 Link features
33. 463800463000000018004630 seem 3 Format Content A2 31 l6 Variable number l6 Variable number l6 000000 12 01 l6 Variable number I1 0 A1 96 Description Record descriptor Polygon ID unique in file for administrative unit Reference to PART 10 in Collect Record that is preceded by a value of 31 in REC DESC Unique in file ID for Chain Cross reference to CHAIN ID in Chain Record The number of attribute identifiers which follow Cross reference to ATT ID in Attribute Record No further records Record terminator 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE POLY 10 CHAIN 10 ID are the same variable number Co Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 62 of 75 Complex Polygon Record CPOLY 33 Field Position Format Content Description REC_DESC 01 02 A2 33 Record descriptor CPOLY_ID 03 08 l6 Variable number Unique ID in file for complex polygons Reference to PART ID in Collect Record that is preceded by a value of 33 in REC DESC NUM PARTS 09 12 4 Variable number Number of iterations of POLY D and SIGN POLY ID 13 18 l6 Cross reference to POLY D in Polygon Record SIGN 19 19 A1 For containing polygons or for contained polygons respectively GEOM ID l6 000000 NUM ATTS I2 01 The number of attribute ide
34. 8 A2 HA Mnemonic for HECTARES attribute VALUE 19 30 R12 3 Variable number Area of polygon or complex polygon CONT MARK 31 31 I1 0 No further records EOR 32 32 A1 96 Record terminator Record example 14000046PI800046HA0000039468770 amp eas ao S 258 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Zl eii ic b a cl Template NOTE 1 Valid VALUE for range is 040000 to 999999 0 00 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 60 of 75 Geometry Record GEOMETRY 1 21 Field Position Format Content Description REC_DESC 01 02 A2 21 Record descriptor GEOM ID 03 08 l6 Variable number For link cross reference from GEOM 10 in Chain Record GTYPE 09 09 I1 2 Defines as line geometry a link NUM COORD 10 13 4 Variable number Number of coordinate pairs 14 21 18 Variable number Easting offset to 0 1 m Y COORD 22 29 18 Variable number Northing offset to 0 1 m QPLAN 30 30 A1 lt S gt Not used ATT_ID l6 Variable number For links cross reference to 10 in Attribute Record CONT MARK 11 0 No further records or 1 or continuation record follows EOR 1 Record terminator variable integer Record examples 21000001200020000000000040009 0000000000000000 0000010 21000002200020000000000048909 000000000004000
35. 9 0000020 21800002200120000200000050857 0000209600050905 0000235200051086 1 000000269100051180 0000298200051282 0000343600051455 0000371300051573 1 000000408800051761 0000429400051866 0000457600052137 0000472600052285 1 000000492400052503 8000020 B iessleizi i2e 222292 291393 422 i2 94 922 22B 2 x 9 bs pes rtre Tesse arras 12345678901234567890123456789012345678901234567890123456789012345678901234567890 es os Template NOTE 1 X Y COORD iterate the number of times shown in NUM COORD NOTE 2 Continuation Record s CONTREC commence with the record descriptor 00 Line Record LINEREC 23 Field Position Format Content Description REC_DESC 01 02 A2 23 Record descriptor LINE_ID 03 08 l6 Variable number Line ID unique in file GEOM ID 09 14 l6 Variable number Cross reference to 10 in Geometry Record for link NUM ATT 15 16 I2 01 The number of attribute identifiers which follow ATT ID 17 22 l6 Variable number Cross reference to ATT ID in Attribute Record CONT MARK 23 23 I1 0 No further records EOR 24 24 A1 Record terminator Record example 23800463800463018004630 2 sect 2aaks laser de ves RR ve I RT ena 12345678901234567890123456789012345678901234567890123456789012345678901234567890
36. EMBLY CONSTITUENCYNWAENWELSH ASSEMBLY ELECTORAL REGION WM1 OOC WESTMINSTER 0 o 99 99 oe 42 2 O05AANCIVIL ADMINISTRATION AREANVANCIVIL VOTING AREA FA FI1 OOLLER AREANJANJUDICIAL AREA TA TOPOGRAPHIC AREA 0 42 NBA3 O06CPCNCIVIL PARISH OR COMMUNITYNCPWNCIVIL PARISH OR COMMU1 oo 00 WARDNCTYNCOUNTYNCEDNCOUNTY ELECTORAL DIVISIONNUTENUNITARY AUTHORITY EL1 OOECTORAL DIVISIONNUTWNUNITARY AUTHORITY WARD 0 s esses eass dan erer evens ces Beer 9 98 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 66 of 75 Volume Termination Record VOLTERM 99 Field Position Format Content Description REC_DESC 01 02 A2 99 Record descriptor FREE_TEXT 03 A See note1 below Message CONT_VOL 11 0 No further volumes or 1 or continuation volume follows EOR z A1 Record terminator variable integer NOTE If there are further volume s to follow the FREE field contains the following message End Of Volume nn Transfer Set Continues On Volume nn 1 If there are no further volumes the FREE TEXT field contains following the message End Of Transfer Set Record examples 99End Of Volume 01 Transfer Set Continues On Volume 02 1 cg
37. ID ID ID CPOLY 33 CHAIN 24 GEOM 10 GEOM 10 CHAIN ID CPOLY ID POLY 10 CHAIN ID POLY ID ID COLLECT 34 ATTREC 14 ATTREC 14 Collection of Polygon and CPOLY ID or POLY ID Features CPolygon COLL ID ID ID ID Additional relationships between record IDs The same ID number is used wherever there is a one to one relationship between different types of records Thus COLL ID ATT ID for collection of features The COLL ID is found in the Collection of Features Record The ID in the Attribute Record for collection of features CPOLY_ID ATT_ID for complex polygon The CPOLY ID is found in the Complex Polygon Record and the Collection of Features Record The ATT_ID is found in the Attribute Record for CPOLY POLY ID CHAIN ID ATT ID for polygon The POLY 10 is found in the Polygon Record and the Collection of Features Record The CHAIN ID is found in the Polygon Record The ID is found in the Attribute Record for polygon C Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 44 of 75 LINE ID GEOM IDJ ATT ID for links The LINE ID is found in the Line Record The GEOM 10 is found in the Geometry Record and the Chain Record The ATT ID is found in the Attribute Record for link Tidal and other coastal infor
38. O Boundary Line User guide and technical specification Boundary Line User guide Contents Section Preface Chapter 1 Chapter 2 Chapter 3 Page no 4 CONTACT det ils MA 4 Use of the product dees ite 4 P rpose and disclaimer 4 Copyright inthis GUJE 2 eet leiden Rea Dacus 4 Data copyright and other intellectual property rights 2 en 5 HN ccm 5 Back up provision of the 5 USING this 5 An introduction to Boundary Line nn nennt 6 Bouindary Lin6 Teatures RT E 6 Boundary Line benefits 1 1 2 1 eed arbe ado ada 7 Boundary Lime applications ettet E sette et 7 Boundary Line files and 7 Requirements to utilise enne nennen 8 aL e Y 8 8 Transfer formats a e von ERE RN TOP MR ERR 9 RE 9 Update
39. RNWOOD 01May2007 N A N A District 0 o Boundary Line user guide annexe v1 0 04 2007 Crown copyright 26 of 75 Boundaries D District U A Unitary Authority County LB London Borough Op Date SI Yr 1 Comments Met Dist Metropolitan District NORTHAMPTONSHIRE SOUTH 01 May 2007 N A N A Amend Parish name NORTHAMPTONSHIRE Hinton in the Hedges to Hinton in the Hedges SOUTH 01 May 2007 N A N A Adjust boundaries at MLW GLOUCESTERSHIRE SOUTH 01 May 2007 N A N A Amend Parish Bdy GLOUCESTERSHIRE Wales U A Unitary Authority Op Date SI Yr SI Comments WALES 03 2007 2006 1041 Assembly amp Assembly Const Order POWYS 01 May 2007 N A N A Llanrhaeadr ym Mochnant C has been divided into two Two Communities of the same name existed either side of the abolished District Bdy now ED When POWYS County was created in 1996 no provision was made for amalgamating the two communities Scotland U A Unitary Authority Op Date SI Yr SI No Comments ABERDEEN CITY 03 May 2007 2006 511 Ward Order ABERDEENSHIRE 03 May 2007 2006 416 Ward Order ANGUS 03 May 2007 2006 393 Ward Order ARGYLL AND BUTE 03 May 2007 2006 378 Ward Order CITY OF EDINBURGH 0
40. Record terminator 43 Other features S 43 Unique identifiers for administrative unit 43 Relationships between record 44 Tidal and other coastal 45 Complex 45 Data classification and 45 Attribute codes UNA S 45 Explicit administration and or voting area 47 Transfer set S TUCIUFG cete tane RET A 48 Mfel hu duenle 48 Database records eret rte ERR REX RENE AE CX e RA ua CX EARS 48 SEGUON elle 49 vecon body Calan 49 Section body TECONS aee Fedora Ede emere dde runs 50 How the section body data is 50 Section body record SITUCITUFO ede 51 Data Supply RH 51 Supply of data on formatted nenne 51 Record structures for the transfer of Boundary Line in 52 NTF record
41. UTH NORFOLK 03 2007 2007 485 Ward Order SURREY TANDRIDGE 03 May 2007 2007 331 Ward Order WARWICKSHIRE RUGBY 03 2007 2007 327 Ward Order WARWICKSHIRE WARWICK 03 2007 2007 685 Ward Order PETERBOROUGH 03 May 2007 2007 325 Ward Order NOTE Boundary Line only represents the boundaries that are currently operational Future dated or unsigned 5 5 will not be included this ensures that the boundary information currency is correct at the time of the dataset release Also Sl s that are operational May but signed off too late for inclusion in this May 2007 product would be included in the next suitable release 2222 Boundary Line user guide annexe v1 0 04 2007 Crown copyright Page 28 of 75 AnnexeB Product and service performance report form Ordnance Survey welcomes feedback from its customers about Boundary Line 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 By Co UT oa a 10 T Quotation or order reference 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
42. VALUE 23 26 l4 See notes 2 and 3 below Feature code optional CONT MARK 27 27 11 0 No further records EOR 28 28 A1 14800044LK0000000000FC00710 14800045LK00001509600 i EREXIT devas 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE 1 Valid VALUE for LK range is 0000040000 to 9999999999 NOTE 2 Valid VALUE for FC range is 0071 NOTE 3 Where optional fields are not present CONT MARK and EOR fields will be in positions 21 and 22 LL Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 57 of 75 Attribute Record ATTREC 14 for Collection of Features Record COLLECT 34 Field REC DESC ATT ID VAL TYPE VALUE VAL TYPE VALUE VAL TYPE VALUE VAL TYPE VALUE VAL TYPE VALUE VAL TYPE VALUE DIVIDER VAL TYPE VALUE CONT MARK EOR variable integer Position 01 02 03 08 09 10 11 16 17 18 19 30 31 32 33 39 40 41 42 43 44 45 46 48 49 50 51 Format A2 16 2 2 R12 3 A2 AT A2 A2 A2 A3 A2 A1 A2 A3 A1 Content 14 Variable number See note 1 below NA Variable number CC lt 5S gt or CCDD lt 3S gt or CCDDWW lt S gt or CCDDPAR or QOUA lt 3S gt or OOUAWW lt 1S g
43. ach county named in the file the following will appear in the COLLECT record COLL 10 to its related districts and COLL 10 to its related county EDs e For each district named in the file the following will appear in the COLLECT record COLL_ID to its related district wards COLL_ID to its related civil parishes or communities where present and COLL_ID to its related non civil parishes where present e For each unitary authority named in the file the following will appear in the COLLECT record COLL 10 to its related unitary authority wards or unitary authority EDs COLL_ID to its related civil parishes or communities where present and COLL_ID to its related non civil parishes or communities where present C Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 47 of 75 For each metropolitan district named in the file the following will appear in the COLLECT record COLL 10 to its related metropolitan district wards COLL 10 to its related civil parishes where present and COLL 10 to its related non civil parishes where present For the Greater London Authority the following will appear in the COLLECT record COLL ID to all the Greater London Authority Assembly constituencies and COLL ID to all the London boroughs including the City and County of London For each London borough named in the file the following will appear in the COLLECT record
44. al or support materials without the prior written consent of Ordnance Survey Using the technical specification This technical specification for Boundary Line provides specific details of the structure content and format of the product for those using the data in geographic information or other computer system It should be used in conjunction with the introductory Boundary Line user guide which gives guidelines and advice on how a customer might derive the maximum value from the product Ordnance Survey is committed to providing customers with consistently high quality geographic information As such Ordnance Survey regularly applies several data quality measures to the product These quality measurements are based on the principles identified in ISO 19113 Geographic Information Quality principles 2002 Please refer to the glossary if you are unfamiliar with any of the words or terms used The glossary can be found at annexe A What you need to use Boundary Line Hardware Provided that sufficient memory storage facilities and a suitable software viewer application see below are available there are no constraints on the hardware platforms that can be used The range of hardware that can typically be used varies from higher specification personal computers PCs to mainframe computers Software Boundary Line is inert data and does not include software for data manipulation To fully exploit Boundary Line it is necessary to use ap
45. ame Date of standard data dictionary Not used Not used Continuation record follows Record terminator Description Record descriptor Product specification The name of the feature classification scheme being transferred Product specification date Not used Not used Default model is used No further records Record terminator 000000001 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 54 of 75 Feature Classification Record FEATCLASS 05 Field Position Format Content Description REC_DESC 01 02 A2 05 Record descriptor FEAT CODE 03 06 l4 0071 Feature code for MHW CODE COM 07 16 A10 108 Not used STCLASS 17 36 A20 208 Not used FEATDES E A High Water Mark HWM For MHW DIVIDER E A1 Divider used to terminate variable length fields CONT MARK ia I1 0 No further records EOR 1 variable integer Record example 050071 High Water Mark HWM 0 i sescledes sess 29d e9 decc5ed eR 8 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Section Header Record SECHREC 07 Field REC DESC SECT REF COORD TYP STRUC TYP XYLEN XY UNIT XY MULT ZLEN Z UNIT Z MULT X ORIG Y ORIG Z DATUM CONT MARK EOR Position
46. ard 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 Land Line Landplan and OSGB36 are registered trademarks and Boundary Line is a trademark of Ordnance Survey the national mapping agency of Great Britain Free Adobe and Acrobat Reader are registered trademarks of Adobe Systems Incorporated ESRI are registered trademarks of Environmental Systems Research Institute Inc MapInfo is a registered traemark of MapInfo Corporation Back up provision of the product You are advised to copy the supplied data to a back up medium Using this guide The documentation is supplied in portable document format PDF only Free Adobe Acrobat Reader software which displays the guide incorporates search and zoom facilities and allows you to navigate within Hyperlinks are used to navigate between associated parts of the guide and to relevant Internet resources by clicking on the blue hyperlinks and the table of contents If you are unfamiliar with any words or terms used and require clarification please refer to the glossary at the end of the document 0 Boundary Line user gu
47. asic principles Boundary Line is the key dataset of administrative and voting boundaries in Great Britain It is a representation in computer readable form of a specialist large scale map including real world objects which may be tangible such as the mean high water mark or intangible such as a district boundary GIS software provides the functionality to store manage and manipulate this digital map data The properties of the data make it suitable as a key base for users wishing to develop applications Boundary Line is also suitable for use within other digital mapping systems Boundary Line is coordinated on the National Grid which allows for the easy superimposition of other datasets Links represent all linear features that is boundaries extent of the realm EOR and mean high water springs mark MHW They are strings of coordinated line segments and have relationships to polygon features in order to convey descriptive characteristics of the link Links in Boundary Line may comprise up to several thousand line segments A chain is the closed loop of links bounding a polygon Nodes are the representation of the points at the start and end of a link 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 Nodes are implicit in Boundary Line Polygons are continuous areas defined by sets of bounding closed lin
48. c analysis e customised graphic output asset management Boundary Line files and sub levels The data is supplied as named files The named files include all of the other relevant sub levels of electoral boundaries that belong under that high level administration these are Named file type Possible sub level of boundaries within the named file County The named county district district ward civil parish county electoral division ED Unitary authority The named unitary authority unitary authority ward or unitary authority ED as appropriate civil parish where appropriate together with community in Wales Metropolitan district The named metropolitan district metropolitan district ward civil parish where appropriate Greater London Authority The Greater London Authority Greater London Authority Assembly constituency London borough London borough ward Scottish parliamentary electoral region The named Scottish parliamentary electoral region Scottish parliamentary constituency Welsh assembly electoral region The named Welsh Assembly electoral region Welsh Assembly constituency Westminster constituency The named Westminster constituency European region The named European region Boundary Line user guide chapter 1 v1 0 04 2007 Crown copyright Page 7 of 75 The following table represent the named files contained in Boundary Line NTF May 2006 specification Acomplete dataset of Great Britain has 824
49. ction of related records The records on a file may be related by a specific purpose format or data source and the records may or may not be arranged in sequence A file may be made up of records fields words bytes characters or bits font The style of text character used format The specified arrangement of data for example the layout of a printed document or the arrangement of the parts of a computer instruction or the arrangement of data in a record A specification that defines the order in which data is stored or a description of the way data is held in a file 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 computer database and appropriate applications software header See map header implicit Data that is not directly described in a digital form The relationship between two adjacent objects may be implicit in that they are within a specified distance of each other To determine this further processing is required layer A subset of digital map data selected on a basis other than position For example one layer might consist of all features relating to counties and another to wards Also known as a level 0 0 o NMENENENMHIBD OENB E Rb OR RNMNgNMNMNEN Boundary Line technical specification ann
50. dentifiers for administrative unit link and polygon There are three identifiers in Boundary Line that help you identify features and which are provided to create consistent references between successive releases of Boundary Line data They are unique within each feature type throughout the whole dataset and maintained through successive annual updates See chapter 2 in the technical specification for Other attributes and ID information These identifiers are never modified only created or deleted If a feature is deleted from the Boundary Line database then the identifier ceases to exist ADMIN AREA 10 GLOBAL LINK ID GLOBAL POLYGON ID Text There is no direct cartographic text in Boundary Line Names area values and census agency codes are held as attributes 00 Boundary Line user guide chapter 2 v1 0 04 2007 Crown copyright Page 12 of 75 Chapter 3 Boundary Line explained Relationships of administrative areas The Boundary Line product supplies the administrative area relationships explicitly within the COLLECT record A district is a division of a county a civil parish is a division of a district A county is divided for voting purposes into Electoral Divisions EDs and a district is divided for voting purposes into district wards With the introduction of unitary authorities there are now two and three tier local government hierarchies The three tier system remai
51. dicating the type of area for example CPC meaning civil parish or community NB selected areas have this code to indicate a non area is coincident with this area NA coastal areas carry the area of non land that constitutes this area Unique identifiers for administrative unit ADMIN AREA Al Each administrative unit carries a unique identifier Al this is the same identifier that was supplied in the previous specification of Boundary Line The same Al attribute is associated with every component polygon forming part of an administrative unit irrespective of the number of polygons The same attribute is also associated with every component administration forming part of an administrative unit even if the administration carries different name attributes NM for example MILTON CP and MILTON CP Det No 1 22222 Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 43 of 75 GLOBAL LINK 10 LK Each link carries a unique identifier LK This is the same identifier that was supplied in the previous specification of Boundary Line GLOBAL POLYGON ID Each polygon carries a unique identifier This is generally the same identifier that was supplied in the previous specification of Boundary Line Relationships between record IDs Figure 5 1 Relationships between record IDs LINEREC 23 GEOMETRY1 21 Link ATTREC 14 LINE ID Link ID ID GEOM
52. e Header Record DBHREC indicates the effective date of this product specification Product release Boundary Line updates are released twice a year spring and autumn The updates represent boundaries as defined and modified by Orders Acts and Statutory Instruments as at a date that falls typically during the first week of the preceding May This date appears in each Section Header Record SECHREC in the SURV DATE field The copyright date of each release is the same as the SURV and is shown in each Section Header Record SECHREC in the COPYRIGHT field NTF version The current version is NTF v2 0 Level 3 and will be supplied until further notice The NTFVER field of the Volume Header Record VOLHDREC indicates the NTF version The effective date of the definition of NTF v2 0 in Boundary Line is 15 May 1992 and is indicated by the DDATE field of the Database Header Record DBHREC Specific Boundary Line NTF Information Area measurement Area measurements are delivered for each polygon and complex polygon in each file and include the foreshore and tidal water They are quoted to a precision of 0 001 ha which is the current DCLG specification The accuracy of the measurement is dependent upon the source data used see Resolution Coordinates Coordinate values and the number of coordinate pairs in a feature are transferred in the Geometry Record GEOMETRY 1 All coordinates are expressed as strings of eight nu
53. e and or containing it A node is only deleted if the link containing it as a terminating node is deleted northings See rectangular coordinates object A collection of entities which form a higher level entity within a specific data model object real world A recognisable discrete part of the real world operative date The date the order was made not necessarily the day it becomes live and in use origin The zero point in a system of rectangular coordinates physical record NTF A physical record may be a fixed length containing 80 characters or variable length containing up to 80 characters point and line data A form of vector data designed for map production in which all map features are designated as points lines or text Point and line data does not carry the topological relationships between features point feature A zero dimensional spatial abstraction of an object with its position defined by a coordinate pair Points are represented by nodes which may be isolated or part of a link terminating Points may also be represented by symbols which 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 is 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 connec
54. e with all of the sub levels of boundary within it The London Boroughs and the City and County of the City of London have been classified as London Boroughs The Metropolitan Districts within the former Metropolitan Counties disbanded in 1985 are classified as Metropolitan Districts e Greater Manchester e Merseyside e South Yorkshire e West Yorkshire e Tyne and Wear and e West Midlands The Inner and Middle Temples The places known as The Inner and Middle Temples are within the City of London only for some purposes They are not shown in Boundary Line but their areas have been wholly included within the City and its Wards for this dataset There are two distinct areas with other areas held jointly and the boundaries are so intermixed that they have never been published by Ordnance Survey separately A record of these boundaries is however held in the Boundary Record Library for reference purposes Isles of Scilly The Isles of Scilly are administered by a single tier authority the Council of The Isles of Scilly and are not part of the County of Cornwall although linked with it for some purposes For the purposes of this dataset however it is classified as a County There are no Districts Electoral Divisions or Wards within this area Parish Community Wards Divisions of parishes England and communities Wales not included in Boundary Line Lands common to These are areas where the limits o
55. electoral boundaries for the whole of Great Britain It has been digitised against Ordnance Survey generalised 1 10 000 Landplan mapping The process of generalising for 1 10 000 scale mapping may have caused certain features to be moved from their true ground position for the purposes of map clarity The result being Boundary Line and large scale boundaries will not always be coincident Feature attribute data An attribute is the descriptive characteristic of a feature that is a non spatial element In Ordnance Survey map data terms an attribute can be a feature type these are character codes or a distinctive name number or code for example Bassett ward or 145 232 hectares Attribute codes relevant to NTF are fully described in chapter 4 of the technical specification Area codes Each administrative unit is classified by means of an area code AC These area codes are allocated when each feature is initially interpreted and captured from source This means that a county is distinguished from a ward by the area code allocated to it The polygon features can be classified by tracing their relationships to administrative units Consequently links can be classified by tracing their relationships to polygons These area codes are all listed in chapter 2 of the technical specification Other attributes It is possible with appropriate software for you to add other names or values of your own choice as attributes of features Unique i
56. epresents boundaries as defined and modified by Orders Acts and Statutory Instruments where available to Ordnance Survey as at a date that falls typically during the first week of the preceding May Boundaries having an operative date that has not yet been reached by this date are not represented in that release of Boundary Line 2222 _ _ Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright 21 of 75 Order Act or Statutory Instrument A document signed by the relevant Secretary of State or a local authority letter describing and giving legal authority for boundary changes Other Acts and Orders can effect the addition of new boundary information for example seaward extensions and harbour acts Superseded date This is the last date on which a boundary was current Where an effective date applies the superseded date will be the day before the next dissolution of Parliament or the day before the next European Assembly election in the United Kingdom Boundaries are no longer shown in Boundary Line if they have been superseded at the time of the annual snapshot of boundaries that each release of Boundary Line represents Survey change When changes occur to tide lines rivers or streams caused by natural and gradual forces any boundaries that are linked to these altered features will move with them When the movement of a boundary MHW or EOR alignment in Boundary Line reflects such c
57. er CoordSys Earth Projection 8 79 m 2 49 0 99960127 17 400000 100000 Bounds 7845061 1011 15524202 1641 8645061 1011 4470074 53373 Columns 15 Name Char 60 Area Code Char 3 Area Description Char 50 File Name Char 50 Feature Serial Number Integer Collection Serial Number Integer Global Polygon ID Integer Admin Unit ID Integer Census Code 7 Hectares Decimal 12 3 Non Inland Area Decimal 12 3 Area Type Code Char 2 Area Type Description Char 25 Non Area Type Code Char 3 Non Area Type Description Char 36 Example of a MIF file header Mean high water Version 300 Charset WindowsLatin1 Delimiter CoordSys Earth Projection 8 79 m 2 49 0 99960127 17 400000 100000 Bounds 7845061 1011 15524202 1641 8645061 1011 4470074 53373 Columns 5 Feature Code Char 4 Feature Description Char 5 File Name Char 50 Feature Serial Number Integer Global Link ID Integer Data CL Em Boundary Line technical specification chapter 2 v1 0 04 2007 Crown copyright Page 36 of 75 Example of a MID file record Mean high water 0071 High CAMBRIDGESHIRE COUNTY 982 58737 File names for layered MID MIF England County inc GLAs county electoral division district borough unitary district borough unitary ward european region greater london const high water parish Scotland district borough unitary district borough unitary ward european region high wa
58. ered files MID MIF district borough unitary district borough unitary ward european region scotland and wales const see note and wales region see note Westminster const NOTE Scotland and Wales files contain only Scottish information in the Scotland data folder and only Welsh information in the Wales data folder Figure 3 2c An example of the Welsh directory and layered files MID MIF district borough unitary european region cotland and wales const see note scotland and wales region see note unitary electoral division westminster const NOTE Scotland and wales files contain only Scottish information in the Scotland data folder and only Welsh information in the Wales data folder Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 16 of 75 Boundary Line principles and features This following explains the representation of features in Boundary Line and describes various definitions and exceptions Administrative area A term used by Ordnance Survey to refer to all public administrative areas For the Boundary Line dataset the following are included under this term e n England e county e unitary authority e metropolitan district e district e civil parish NOTE depicted if appropriate notification has been received Not all parishes have councils Isles of Scilly e European Electoral region e parliamentary Westmins
59. es They are representational of areas such as electoral wards and have relationships to administration collection features in order to convey descriptive characteristics of the polygon These are explicit within the data and can be viewed and manipulated with appropriate software Each link feature has associated geometry this will be two or more coordinate pairs Boundary Line data source Boundary Line is currently updated by mapping against Landplan 1 10 000 scale and in certain cases large scale sources Complex polygons Complex polygons are polygons that wholly enclose other polygons They only occur when an administrative unit wholly encloses one or more others at the same level for example a rural district surrounding an urban district 0 Boundary Line user guide chapter 2 v1 0 04 2007 Crown copyright Page 10 of 75 Figure 2 1 A complex polygon Cambridge District surrounded by South Cambridgeshire District HUNTINGDONSHIRE DISTRICT SOUTH CAMBRIDGESHIRE DISTRICT CAMBRIDGE DISTRICT Feature information Boundary Line has three feature classes e administrative units with attributes e polygon features with attributes and e linear features links with attributes and geometry The position and shape of real world features are represented in Boundary Line data as geometric structures of links They are arranged into recognisable categories Full listings
60. exe v1 0 04 2007 Crown copyright Page 71 of 75 level A level corresponds to a single type of administrative unit for example a ward or a district and is conceptual in form See also layer 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 coordinate pairs and may be curved or straight Curved lines consist of a series of very short straight line segments As an object abstraction a line has no width line segment A vector connecting two coordinated points line and or link collect Whenever an update occurs the original Boundary Line is broken into many links due to the need to retain the old part of the boundary This entity allows the original line to be recreated using the current links There are as many occurrences of this entity for a given line as there are links that make it up Any query concerning the history of a line for example to recreate a Boundary Line at a point in time needs to retrieve all the relevant occurrences and join the links together to form the geometry of the original line This entity should relate to the NTF Collect record link or edge Links are the representation of line features They are made up of one or more consecutive non intersecting link segments with common attributes between two
61. f 75 Figure 3 1a Relationships of administrative areas for England nested Local Administrative Area Local Government Government Europe i Voting Area Voting Area 1 Nested England Nested t Electoral Division Isle of Wight only 1 Electoral Division Nested Nested London Boroughs amp Metropolitan County District parts of parts of England England Unitary Authority parts of England Nested Ward except Isle of Wight Nested NOTE Some Dist s UA s have or are non Parished Areas Nested Nested Civil Parish some Metropolitan Districts only Civil Parish Nested Administrative Area Voting Area Nested Nested Electoral Division Unitary Authority Nested Community Ward Community Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 14 of 75 Figure 3 1c Relationships of administrative areas for Scotland nested Voting Area Administrative Area Europe jt Nested Scotland Nested Unitary Authority county electoral division district borough unita district borough unitary ward european region greater london const unitary electoral division Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 15 of 75 Figure 3 2b An example of the Scottish directory and lay
62. f the parishes concerned have not been determined and the area itself is common to or belongs to two or more parishes In Boundary Line they are classified as separate parishes with the name LANDS COMMON TO THE PARISHES OF applied sometimes abbreviated to LCPs___ These areas are allocated their own attributes and so on 0 00 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 19 of 75 Figure 3 4 An example of Lands common to ATWORTH CP BROUGHTON GIFFORD CP LCPs of BROUGHTON GIFFORD and MELKSHAM WITHOUT CP MELKSHAM WITHOUT CP HILPERTON CP SEMINGTON CP River Dee The boundary between Merseyside the former county of and the county of Cheshire and the Flintshire unitary authority area has not been determined and the line adopted in Boundary Line is for the purposes of Ordnance Survey only so that polygons can be created River Mersey Certain sections of the boundary between Merseyside the former county of the county of Cheshire and the districts of Liverpool Wirral Ellesmere Port and Neston Vale Royal and Halton have never been determined For the purposes of Boundary Line and by agreement with DCLG 1 the district boundaries of those parts of Ellesmere Port and Neston Vale Royal and Halton that abut the Mersey estuary have been made coincident with the limits of the relevant districts wards at the centre of the channel at high water CCHW 2
63. feature An item of detail within a map which can be a point and or symbol text or line 0 Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 70 of 75 feature NTF The formal representation of an object A simple feature or primitive exists in NTF when a point line complex line polygon text string or external record is created with or without associated attribute records A complex feature exists in NTF when a group of simple and or complex feature records are combined in a complex polygon or collection of features record with or without associated attribute records feature classification record A specific named NTF record FEATCLASS which 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 either of the object surveyed or its representation on the map or both feature record The logical information both spatial and attribute describing a feature or entity feature serial number FSN A number used as a feature identifier usually allocated on a sequential basis field A specified part of a record containing a unit of data such as the date of digitising The unit of data may be a data element or a data item In NTF a field is a subdivision of a physical record Every field has a name and a predefined interpretation file An organised colle
64. fee you will be provided with a replacement dataset for all Boundary Line files supplied in accordance with your licensing agreement Boundary Line features A list of the features within Boundary Line includes e civil parish England and community Wales e county e district e metropolitan district e electoral division county and unitary European Electoral region Greater London Authority London borough including the county of the City of London Greater London Authority Assembly constituencies the London Proportional Representation voting areas e metropolitan district parliamentary Westminster constituency e parliamentary Scottish constituency and electoral region e unitary authority e ward district unitary metropolitan and London borough e Welsh Assembly constituency and electoral region e extent of the realm EOR either mean low water mark England and Wales mean low water springs mark Scotland or seaward boundary extensions e mean high water mark England and Wales and or mean high water springs mark Scotland both are abbreviated to MHW in this user guide e distinctive names e census agency codes in England Wales and Scotland for counties unitary authorities districts wards and electoral divisions e area measurements e unique administrative unit link and polygon identifiers and annual updates of the dataset 0 0
65. fer set Not used Volume sequential number NTF Level 3 NTF version 2 0 Variable length records Character used for EOR on unformatted media If default then EOR is 96 for formatted media Divider used to terminate variable length text fields No further records Record terminator 2004021900000130200V 0 22294 oes s e229 9 2 ote Tesne own 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE 1 VOLNUM is 01 for the first volume and is incremented for subsequent volumes Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 53 of 75 Database Header Record DBHREC 02 Field Position REC DESC 01 02 DBNAME 03 22 DDNAME 23 42 DDATE 43 50 DDBASE 51 70 DDBDATE 71 78 CONT MARK 79 79 EOR 80 80 Continuation record Field Position REC DESC 01 02 FCNAME 03 22 FCDATE 23 30 DQNAME 31 50 DQDATE 51 58 DATA MODEL 59 60 CONT MARK 61 61 EOR 62 62 Record examples 02Boundary Line 00A20N FC Format A2 A20 A20 D8 A20 D8 I1 A1 Format 12 20 08 20 DEFAULT 02 00 20021001 Content 02 Boundary Line 7 S gt DEFAULT 02 00 lt 75 gt 19920515 208 00000000 1 Content 00 A20N FC 13s YYYYMMDD 208 00000000 00 0 19920515 00000000000 ema Description Record descriptor Product name Standard NTF data dictionary n
66. future Effective date A future event of unknown date for example the next general election at which time the changes specified in an Act Order or Statutory Instrument will come into operation This term is solely applied to parliamentary Westminster and European region boundaries Boundary changes are not incorporated into Boundary Line unless they have become operative at the time of the annual snapshot of boundaries that each release of Boundary Line represents Because of this parliamentary constituencies and European regions in Boundary Line are normally those in which the MPs AMs MEP s and MSP s are or were sitting at the time of the annual snapshot of boundaries that each release of Boundary Line represents For example the new Scottish Westminster parliamentary constituency boundaries which became effective at the time of the May 2005 general election were first represented in the October 2005 Boundary Line release 0 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 18 of 75 Exception areas The following are specific exceptions to the normal rules Greater London and the metropolitan counties Greater London covers the area of the 32 London Boroughs plus the City and County of the City of London Greater London is no longer a County The Greater London Authority which has no authority over the autonomous London Boroughs is held as one named fil
67. gh water springs mark is subject to continuous change but the captured alignment of a tide line is a snapshot on one day It is not practical to revise tide lines very frequently Mean low water springs Mean low water springs mark is shown as the extent of the realm except when contained within a seaward extension when it is then omitted Banks of sand mud shingle or rock separated from the main line of mean low water springs and covered at high tide are not shown When there are large areas of these banks separated from the main foreshore by narrow channels the channels are ignored and the whole bounded by mean low water springs The extension of the line of mean low water springs into a channel above Point B becomes edge of channel and is not shown Mean low water springs mark and hence EOR is subject to continuous change but the captured alignment of a tide line is a snapshot on one day It is not practical to revise tide lines very frequently Normal tidal limit NTL The point at which the level of a river or stream ceases to be affected by the tidal flow This point is often an artificial barrier such as a lock or weir Pier A pier under which water flows is not normally considered to be within the realm There are some cases however where a structure has specifically been included within the realm by Act or Order in which case mean high water springs mark and EOR is shown around the limits of the structure
68. hanges this will be noted in the Update notes that accompany each release of Boundary Line Un annexed areas This is an area within the realm which is not included in all the relevant administrative units The area will remain un annexed until further legislation changes its situation and the polygon represents a hole in that level of administration Unitary authorities Unitary authorities and counties effectively create a contiguous layer of administrative units throughout the whole of Great Britain They represent single tier administrations with responsibility for all areas of local government The coastline and associated items Extent of the realm EOR The external bounding line of the Boundary Line dataset is the extent of the realm This means the boundary extent is digitised on the alignment of the mean low water springs MLWS for the seaward extent Boundary Line does not contain a separate mean low water springs MLWS only FC0071 representing the mean high water MHW NOTE To display the EOR both mean high water MHW and another type of boundary for example European electoral region or Westminster constituency need to be displayed together The Territorial Waters Jurisdiction Act 1878 and the Territorial Waters Order in Council 1964 confirm that the extent of the realm of Great Britain as used by Ordnance Survey is properly shown to the limit of mean low water for the time being except where extended by Parliament
69. ide preface v1 0 04 2007 Crown copyright Page 5 of 75 Chapter 1 An introduction to Boundary Line This user guide is an introduction to Boundary Line which offers guidance and advice on how to deliver the maximum value from the product The technical specification provides specific details of the structure content and formats of Boundary Line for customers using the data in a geographical information system GIS or other systems The technical specification should be used in conjunction with the user guide Boundary Line provides administrative and electoral boundaries and their names for England Scotland and Wales Boundary Line represents the hierarchy of boundaries in Great Britain Boundary Line for England and Wales was initially digitised from Ordnance Survey s boundary record sheets at 1 10 000 scale or in some cases at 1 10 560 scale The 1 10 000 scale published mapping has being progressively withdrawn as it is replaced by Landplan Boundary Line now uses this as the source document occasionally mapped against large scale source The census agency codes are supplied by Office of National Statistics ONS and General Registers of Scotland GROS Appropriate software is needed to use the data for your intended application Update notes detailing previous release changes accompany each product release contained within the doc file on the CD and the Change Update document Subject to payment of the annual licence
70. in any further coordinates required to complete a line feature How the section body data is arranged NOTE is designed to transfer any geographic data therefore there is no standard order of records This description of the order of records is specifically for the transfer of Boundary Line data Link feature LINEREC GEOMETRY 1 ATTREC for completed file followed by Polygon feature POLYGON Polygon ATTREC CHAIN and or Complex polygon feature POLYGON Repeating CHAIN CPOLY ATTREC Complex polygon Collection of features COLLECT Collection of features ATTREC for completed file Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 50 of 75 Section body record structure Complex polygon records are included only to deal with polygons with holes as described elsewhere Otherwise all records are compulsory for all transfers Figure 5 2 Hierarchy of records COLLECT Admin unit ATTREC POLYGON AV OP NM NB EN Md oP OLY ren Toygan Complex Polygon ATTREC ATTREC CHAIN PHA POLYGON LINEREC links REN GEOMETRY1 ATTREC LK HW Data supply structure Supply of data on formatted media Boundary Line data is not blocked but is written directly to the output device The transfer set has one dataset and one section One or more transfer sets are put onto the medium
71. ing area type that is defined by the corresponding administrative or voting area s polygon The current values are as follows Name Code Civil parish or community CPC County CTY County electoral division CED Unitary authority electoral division UTE Unitary authority ward UTW OP CENSUS CODE This attribute is conveyed in the Attribute record for the collection of features and provides the code allocated by or GROS to the administrative unit See user guide chapter 3 Boundary Line explained in the user guide for details of the structure and meaning of the codes Where the code is unavailable to Ordnance Survey the attribute value is set to 999999 PI GLOBAL POLYGON ID A unique identifier for every polygon Each attribute is unique to the entire Boundary Line dataset and is generally retained through successive updates of Boundary Line TY AREA TYPE A code allocated by Ordnance Survey to indicate the type of area The current values are as follows Name Type Description Civil administrative area AA Applied to the set of administrations for civil organisation Civil voting area VA The set of voting areas for civil administrations Filler area FA Topographic area TA Judicial area JA Explicit administration and or voting area relationships The COLLECT record has been expanded to show the relationships between administrations and the administrations voting areas explicitly The rules applied are as follows e For e
72. is boundaries extent of the realm and mean high water springs mark All links are broken when they intersect with one another The first and last coordinate pairs in a link correspond exactly with the end coordinates of the adjoining link s Links may comprise up to several thousand line segments Coordinate system The coordinate system is National Grid NG The National Grid coordinates are to a resolution of 0 1 metre This is the resolution of the source data 0 0 Boundary Line technical specification chapter 2 v1 0 04 2007 Crown copyright Page 35 of 75 MID MIF table structures Regions Polylines Title Type Title Type Name Char 60 Feature Code Char 4 Area Code Char 3 Feature Description Char 21 Area Description Char 50 File Name Char 50 File Name Char 50 Feature Serial Number Integer Feature Serial Number Integer Global Link ID Integer Collection Serial Number Integer Global Polygon ID Integer Admin Unit ID Integer Census Code Char 7 Hectares Decimal 12 3 Non Inland Area Decimal 12 3 Area Type Code Char 2 Area Type Description Char 25 Non Area Type Code Char 3 Non Area Type Description Char 36 Example of a MID file record County Bedfordshire County CTY County BEDFORDSHIRE COUNTY 19 489 40935 1158 09 119207 686 0 000 AA CIVIL ADMINISTRATION AREA Example of a MIF file header County Version 300 Charset WindowsLatin1 Delimit
73. izontal distances along original axes Alternatively triplets 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 continuation mark A logical record may contain more data than can be held in a single physical record The physical record contains a continuation mark the penultimate character of the record in NTF to indicate whether more data is to be found in a continuation record continuation record A specific NTF term A continuation record is used where space does not allow one logical record to be contained wholly within one physical record copyright Copyright is a legal property right which enables the creator and or owner 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 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
74. m the polygon seed feature codes The boundary links will have implied codes through their roles in the various polygon CHAIN records HA HECTARES The area of the polygon quoted to a precision of 0 001 ha but subject to the source data accuracies See Resolution LK GLOBAL LINK ID A unique identifier for each link Each LK attribute is unique to the entire Boundary Line dataset and is retained through successive updates NA INLAND AREA The area of the administrative unit that is currently defined as non inland This will include foreshore and tidal water The value is quoted to a precision of 0 001 ha 0 Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 46 of 75 NM NAME This attribute is conveyed in the Attribute record for collection of features and contains the distinctive name of the administrative unit for example LISS CP The name will always include the type of the area in the text string for example HAMPSHIRE COUNTY rather than HAMPSHIRE Exceptions to this rule include County of Hertfordshire which is a unitary authority and The Isles of Scilly which is classified as a county for the purposes of Boundary Line The addition of B at the end of the NAME is to identify the presence of boroughs without affecting the data structure NB NON TYPE CODE A code allocated by the Ordnance Survey to indicate the non administrative or non vot
75. mation See also mean high water springs and mean low water springs in chapter 3 of the Boundary Line user guide EOR The external bounding line of the Boundary Line dataset is the extent of the realm NOTE To display the EOR both mean high water MHW and another type of boundary for example European electoral region or Westminster constituency need to be displayed together MHW Mean high water springs mark is shown as continuous lines within each delivered dataset The lines do not interact with the administrative area lines Mean high water springs mark is represented in Boundary Line by a continuous link feature with feature code 0071 Mean low water springs mark is not shown although it is generally coincident with the EOR The area of non inland is referenced within each administrative unit using the NA attribute Complex polygons Administrative units wholly surrounding others of the same type are examples of polygons with holes in them These are known as complex polygons The Complex Polygon Records CPOLY establish the connection between the single containing polygon and the contained polygons The Complex Polygon Record CPOLY are referenced by the Collection of Features Record COLLECT for the administrative area of which they are part They also have an Attribute Record ATTREC for polygon and collection of features and a Geometry Record GEOMETRY 1 for polygons The polygons associated with a Complex
76. meric characters for the eastings and eight numeric characters for the northings Where appropriate leading zeros are present to complete the eight characters All coordinates are full National Grid coordinates measured from the National Grid origin Link features Links represent all linear features that is boundaries extent of the realm and mean high water springs mark Link features are transferred in the Geometry Record GEOMETRY 1 All links are broken when they intersect with one another The first and last coordinate pairs in a link correspond exactly with the end coordinates of the adjoining link s Links may comprise up to several thousand line segments NN Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright Page 42 of 75 Names The distinctive name of an administrative area is conveyed by way of the NM attribute of the Collection of Features record Punctuation is shown in names but not accentuation for example the name Westward Ho Ward includes the exclamation mark but Ynys M n is shown as Ynys Mon Each administrative area also carries a unique identifier known as the Admin area identifier or Al The same attribute is attached to every component forming part of an administrative area for example MILTON CP and MILTON CP Det No1 Census agency codes See chapter 3 of the user guide Boundary Line explained These codes are conveyed in the OP attribute of the Collection of Feat
77. n region district borough unitary ward region european region region district borough unitary region european region region high water polyline district borough unitary ward region high water polyline parish region european region region parish region scotland and wales const region greater london const region scotland and wales const region scotland and wales region region high water polyline scotland and wales region region unitary electoral division region parish region westminster const region westminster const region unitary electoral division region westminster const region Directory names for nested shapefile England Scotland Wales County European Region European Region European Region Scottish Parliamentary Electoral Region Unitary Authority London Administration Unitary Authority Welsh Assembly Electoral Region Metropolitan District Westminster Constituency Westminster Constituency Unitary Authority Westminster Consituency See chapter 3 Relationships of administrative areas for a hierarchical relationship of the boundaries contained with these files and directories C Boundary Line technical specification chapter 3 v1 0 04 2007 Crown copyright Page 40 of 75 Chapter 4 NTF explained For convenience BS 7567 National Transfer Format v2 0 Level 3 is referred to as NTF The purpose of this document is to e provide a brief description of the presentation of Boundary Line in the NTF transfer format and e pr
78. n spatial qualification of a spatially referenced entity For example a name or descriptive code indicating what an entity represents or how it should be portrayed attribute class A specific group of attributes for example those describing measure serviceability structure or composition attribute code An alphanumeric identifier for an attribute type attribute value A specific quality or quantity assigned to an attribute boundary Boundaries define the areas of the various national local government and some European authorities CAD Computer aided design centroid The position of the centre of gravity of an entity often used to reference polygons character A distinctive mark an inscribed letter one of a set of writing symbols Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 68 of 75 chain A closed loop of links bounding a polygon 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 read by laser coordinate pair A coordinate pair is an easting and a northing coordinates Pairs of numbers expressing hor
79. na are usually included in local government and parliamentary areas d 0 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 25 of 75 Annexe A Change update Statutory Instruments SI and non SI changes in May 2007 Boundary Line release England Boundaries D District U A Unitary Authority County LB London Borough Op Date SI Yr SI Comments Met Dist Metropolitan District GLOUCESTERSHIRE FOREST OF DEAN 02 May 2002 2002 1035 Ward Order LINCOLNSHIRE NORTH KESTEVEN 03 2007 2006 1405 Ward Order NORTHAMPTONSHIRE CORBY 03 2007 2006 1404 Ward Order CITY OF LONDON 02 2002 2002 N A Ward Order HERTFORDSHIRE DACORUM 03 May 2007 2007 139 Ward Order HERTFORDSHIRE 03 May 2007 2006 3112 Ward Order LINCOLNSHIRE SOUTH HOLLAND 03 May 2007 2007 145 Ward Order LINCOLNSHIRE LINCOLN 03 2007 2006 3110 Ward Order NORTHAMPTONSHIRE KETTERING 03 May 2007 2006 3109 Ward Order NORTHAMPTONSHIRE dit AMPTONSHIRE 03 2007 2006 3111 Ward Order NORTHAMPTONSHIRE pue AMPTONSHIRE 03 May 2007 2007 140 Ward Order NORTHUMBERLAND CASTLE MORPETH 03 May 2007 2007 138 Ward Order NORTHUMBERLAND WANSBECK 03 May 2007 2007 148 Ward Order NOTTINGHAMSHIRE 03 May 2007 2007 142 Wa
80. nested Amount of files 30 24 24 Size 409 Mb 300 Mb 62 Mb Format Shapefile layered Shapefile layered Shapefile layered Amount of files 1848 358 234 Size 472 Mb 334 Mb 71 7 Mb Format MID MIF nested MID MIF nested MID MIF nested Amount of files 20 16 16 Size 466 Mb 331 Mb 71 2 Mb Format MID MIF layered MID MIF layered MID MIF layered C Boundary Line technical specification chapter 1 v1 0 04 2007 Crown copyright Page 34 of 75 Chapter2 MID MIF An overview of Boundary Line in MapInfo MID MIF The transfer format is as defined by the MapInfo Professional User s Guide Export MapInfo Interchange Format MIF is an ASCII file format that can fully describe a MapInfo database Both graphic and tabular data are exported into MIF files The graphic data is in a file with a mif extension and the tabular data is in a file with a mid extension MapInfo Interchange Format files can be translated into other formats with other programs An overview of the data structure of a Boundary Line file in MID MIF is shown below Files listed below are supplied in the Data folder on the CD me MIF The files below are created for each layer as they are imported into Maplnfo County DAT County ID County MAP County TAB Structure of Boundary Line in MapInfo Area features Area Features are Polygons with attributes added Link features MHW Links represent all linear features that
81. ns unchanged the two tier system has unitary authorities replacing the county and district levels of administration Unitary authorities may be divided into civil parishes or communities except in Scotland and unitary authority wards or unitary authority EDs for voting purposes In Wales the voting area is the unitary authority ED in Scotland it is the unitary authority ward and in England it is the unitary authority ward except in the Isle of Wight where it is the unitary authority ED England also has metropolitan districts these have no county administration These districts are divided for voting purposes into metropolitan district wards With the introduction of the regional government for London in this document called the Greater London Authority the proportional representation voting area for this new administration is the Greater London Authority Assembly constituency The existing London borough structure also has a relationship with the new Greater London Authority and each London borough is divided for voting purposes into London borough wards Scotland is divided into parliamentary constituencies for voting purposes to elect Members of the Scottish Parliament MSPs The Scottish parliamentary electoral region is a grouping of Scottish parliamentary constituencies Wales is divided into assembly constituencies for voting purposes to elect Assembly Members AMs to the Welsh Assembly The Welsh Assembly electoral region is a
82. nted by a county area boundary Ceremonial counties A ceremonial county is an area that has an appointed Lord Lieutenant and High Sheriff Ceremonial counties are not explicitly represented in Boundary Line Detached parts The description Detached Det only applies to portions of local government or parliamentary constituency areas which are separated from the main area being completely surrounded by other local government or parliamentary constituency areas and not connected by direct access on the ground The description will not be applied to islands or parts of islands in the sea Detached parts have the same attribute and census agency code where applicable as the main area Where there is more than one detached part they are numbered consecutively within the name for example MILTON CP Det No 1 Divorcement Part of a boundary separated from another originally on the same alignment Divorcements are created by the revision of one boundary and not the other Figure 3 3 Divorced boundaries Cardiff South and Penarth Boro Const Vale of Glamorgan Vale of Glamorgan Co Const Cardiff Figure 3 3 shows a boundary divorcement The unitary boundary between Vale of Glamorgan and Cardiff has been realigned whilst the parliamentary Westminster constituency boundary has remained in its original position It is likely that the parliamentary Westminster constituency boundary will also be realigned at some time in the
83. ntifiers which follow ATT ID l6 Variable number Cross reference to ATT ID in Attribute Record CONT MARK 11 0 No further records or 1 or continuation record follows EOR A1 96 Record terminator variable integer Record example 338008840002800614 800865 000000018008840 sees eel 12345678901234567890123456789012345678901234567890123456789012345678901234567890 s e m e E e o c e o Template NOTE Continuation record s CONTREC commence with record descriptor 00 0 0 Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 63 of 75 Collection of Features Record COLLECT 34 Field REC DESC COLL ID NUM PARTS REC DESC PART ID NUM ATTS ATT ID CONT MARK EOR variable integer Record example Position 01 02 03 08 09 12 13 14 15 20 Format Content A2 34 l6 Variable number 14 Variable number A2 31 or 33 or 34 l6 Variable number I2 01 l6 Variable number I1 0 or 1 A1 96 Description Record descriptor Unique identifier Number of iterations of REC DESC and PART ID that is the number of polygons comprising an administrative area together with the number of voting areas Polygon or complex polygon or
84. ntract made between you and Ordnance Survey If there is an inconsistency between the terms of your customer contract and this guide then the terms of your customer contract prevail If you or your organisation has not signed a valid current customer contract then you are not entitled to use the product Purpose and disclaimer This guide is provided for guidance only and does not constitute any warranty representation undertaking commitment or obligation express or implied about the product or its suitability for any particular or intended purpose Any warranties representations undertakings commitments and obligations given by Ordnance Survey about the product and or its suitability for any particular or intended purpose are set out in your customer contract It is your responsibility to ensure that this product is suitable for your intended purpose Ordnance Survey does not accept any liability whether for breach of contract negligence or otherwise for any loss or liability you or any third party may suffer in relying on this guide and any guidance suggestion advice or explanation provided in it Any liability that Ordnance Survey has to you in relation to the product its supply use accuracy data supplied functionality or any other liability arising out of or in connection with the product is limited as set out in your customer contract We may change the information in this guide at any time without notice We do not accept re
85. o NENENENME RREERR N KMHM Rks d g g h p G EN NEN Boundary Line user guide chapter 1 v1 0 04 2007 Crown copyright Page 6 of 75 Boundary Line benefits The high specification of Boundary Line offers you a number of benefits Full coverage of Great Britain supplied as England Scotland and Wales The key boundary dataset for Great Britain suited to multiple applications using a geographical information system GIS and other digital mapping systems The full hierarchy of boundaries Structured vector format offering great functionality census agency codes where available allow you to link Boundary Line polygons with census statistics Area values for every polygon Mean high water springs mark enables you to build and explicitly identify dry land areas within coastal polygons Documented annual updates allow you to easily identify relevant changes Unique administrative area identifiers are retained at each update allowing revised boundaries to be related to your existing data Boundary Line applications Boundary Line provides a detailed and comprehensive dataset of coverage in Great Britain of administrative and voting boundaries that is designed to support a wide range of GIS and desktop mapping applications such as e political analysis e planning applications e environmental analysis legal work e statistical analysis for social or marketing decision making e reference and research or geodemographi
86. of 75 Record examples 14002553A1012343NA0000245218620P13 TYAAACCTY NMCHESHIRE COUNTY 0 14001588AI016261NA0000024823860PA45UH TYAAACDISNMWORTHING DISTRICT NBCPCO 14000183AT025588NA0000089982980PEE TYAAACUTANMREDCAR AND CLEVELAND NBUTENB1 00 0 z bewesleere ee os a28 12345678901234567890123456789012345678901234567890123456789012345678901234567890 Template NOTE 1 Valid VALUE for Al range is 000000 to 999999 NOTE 2 CC represents a two digit county code element DD WW and UA represent two letter code elements for district ward and unitary authority respectively See census agency codes in chapter 3 of the Boundary Line user guide NOTE 3 Continuation Record s CONTREC commence with the record descriptor 00 NOTE 4 Civil parish or community CPC County CTY County electoral division CED Unitary authority electoral division UTE Unitary authority ward UTW NOTE 5 Civil administrative area AA Civil voting area VA Topographic area TA Judicial area JA Filler area FA NOTE 6 England Wales Description AC TY Description AC TY Civil parish or community CPC AA Civil parish or community CPC AA County European Region EUR VA County electoral division CED VA Non civil parish or community NCP FA District DIS AA Unitary authority District ward DIW VA Unitary authority electoral division UTE VA European region EUR VA Welsh Assembly constituency WAC VA Greater London Authority GLA
87. of individual features are listed in chapter 2 of the technical specification Specific Boundary Line NTF Information Each feature has the following component e feature attribute data Each geometric feature has an additional component e feature position Each link has a geometric and attribute component The geometric component defines the positional characteristic of the feature and explicit relationships exist between administrative units and polygons and the links and polygons The attribute component defines the descriptive characteristics of the feature together with the classification Feature position The geometry of map features is defined in terms of coordinates All coordinates used in Boundary Line are based on the Ordnance Survey National Grid NG coordinate referencing system and are quoted to a 0 1 m resolution Despite this Boundary Line data can be no more accurate than its source primarily the generalised 1 10 000 scale mapping There will be positional differences between the boundaries in Boundary Line and Ordnance Survey large scale topographic products This is due to the large scale products being surveyed to a higher degree of accuracy and associated to ground surface features at scales such as 1 1250 and 1 2500 0 0 Boundary Line user guide chapter 2 v1 0 04 2007 Crown copyright Page 11 of 75 Boundary Line has been created as a more generalised set of administrative and
88. ompleteness Completeness is a measure of the correspondence between the real world and the specified data content During digitising all Boundary Line data is checked thoroughly against source documents to ensure as far as reasonably possible that no features have been omitted or misaligned 0 0 Boundary Line technical specification chapter 1 v1 0 04 2007 Crown copyright Page 33 of 75 Boundary Line data properties Boundary Line is a structured link and polygon dataset The data comprises three levels of features 1 the administrative unit has attributes which include the administrative unit s name and census code The administrative unit feature is classified by means of a feature type It also has explicit pointers to the polygons that define its area 2 the polygon includes attributes that define its area value it also has explicit pointers to the links that chains or makes up its edge and may have pointers to holes within the area and 3 the links have a geometry that defines their shape Administrative units polygons and links have unique identifiers to enable you to create consistent references between successive releases of Boundary Line Boundary Line data structure Real world administrative and voting units are modelled and named and have explicit pointers to the polygons that define their area of influence Boundary Line NTF data is defined geometrically as a structured link and
89. ord CODELIST 42 Field Position Format Content Description REC_DESC 01 02 A2 42 Record descriptor FIELD NAME 03 12 A10 108 Not used VAL TYPE 13 14 A2 AC TY or NB Two letter mnemonic FINTER 15 19 A5 2 lt 3 gt or lt 3 gt Format of CODE VAL where 3S denotes three spaces following the text NUM CODE 20 22 I3 Variable number Number of codes defined in list CODE VAL 23 A The code DIVIDER 1 Divider used to terminate variable length text fields CODE DES s A Description of the code DIVIDER dd A1 Divider used to terminate variable length text fields CONT MARK uid I1 0 No further records or 1 or continuation record follows EOR m A1 Record terminator variable integer Record examples 42 ACA3 028 PARISH OR COMMUNITYNCPWNCIVIL PARISH OR COMMU1 00 WARDNCTYNCOUNTYNCEDNCOUNTY ELECTORAL DIVISION DIS DISTRICT DIW DISTRIC1 00 WARD EUR EUROPEAN REGIONNGLANGREATER LONDON AUTHORITYNLACNGREATER LONDON 1 OOAUTHORITY ASSEMBLY CONSTITUENCY LBO LONDON BOROUGH LBW LONDON BOROUGH WARD 1 OOMTC METROPOLITAN COUNTY MTD METROPOLITAN DISTRICT MTW METROPOLITAN DISTRICT1 00 WARD NAT NATION NCP NON CIVIL PARISH OR COMMUNITY NPW NON CIVIL PARISH OR 1 OOCOMMUNITY WARD PSD PETTY SESSIONAL DIVISION RLM REALM SPC SCOTTISH PARLIAME1 OONT CONSTITUENCYNSPENSCOTTISH PARLIAMENT ELECTORAL REGION SEA SEA UTA UNITAR1 00 AUTHORITYNUTENUNITARY AUTHORITY ELECTORAL DIVISIONNUTWNUNITARY AUTHORITY 1 OOWARD WAC WELSH ASS
90. ose of this specification and disclaimer This is the technical specification hereafter referred to as the specification applicable to the Boundary Line 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 rights reserved Any part of this specification may be copied for use internally in your organisation or business so that you can use Boundary Line 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 promotion
91. ovide details to enable Boundary Line files in NTF to be understood and processed in GIS application software The term data structure refers to the organisation and sequence of the records in the data file and not to the geographical topology of the data An overview of Boundary Line in NTF Boundary Line data is supplied in the British Standard national format namely NTF and is transferred in level 3 as variable length records The British Standard for NTF stipulates the following for level 3 This level supports a variety of data models that may include network data polygons semantic relationships and complex features This level is designed for e transferring basic geometry and simple features through the use of geometry and feature records e relating basic geometrical and topological elements to one or more features through the use of chain records e combining features to form complex features through the use of collection and complex polygon records e Using text records both to relate text strings to features and cartographic output and referencing and positioning external features for example raster data the record structure at this level may also be defined to be compatible with data in levels 1 and 2 The governing body for the industry standard NTF is the British Standards Institution BSI Their address is British Standards Institution 389 Chiswick High Road London W4 4AL Tel 44 0 20 8996 9001 Fax 44
92. polygon database Linear boundary features are represented as links a series of connected coordinated points Chains of one or more links form explicit closed polygons Each NTF polygon has explicit pointers to the links that represent its boundaries NTF link geometry and polygon chains within the data model determine the geometric positional characteristics of the data Each real world administrative or electoral voting unit is classified by means of an area code The polygons are classified indirectly by the administrative or electoral voting unit collection in which they appear These polygons within the data model also have associated attributes these give the entities meaning representing the geometric characteristic of an entity with items like area or a unique identity Boundary links are classified indirectly by the polygon chains in which they appear Administrative or electoral voting units polygons and links each have unique identifiers that enable you to create consistent references between successive releases of Boundary Line Boundary Line output resolution A suggested output within 2596 of the source scale 1 10 000 should allow all data to be plotted or displayed without distortions occurring Country England Scotland Wales Amount of files 656 100 68 Size 196 Mb 244 Mb 39 9 Mb Format NTF NTF NTF Amount of files 2772 537 351 Size 417 Mb 305 Mb 62 9 Mb Format Shapefile nested Shapefile nested Shapefile
93. port form nnmnnn 29 v1 0 04 2007 Boundary Line user guide contents v1 0 04 2007 Crown copyright Page 3 of 75 Preface This user guide hereafter referred to as the guide is designed to provide an overview of Boundary Line 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 B 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 Business enquiries 44 0 23 8030 5030 General enquiries calls charged at local rate 08456 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 co
94. propriate application software There are many proprietary systems available and Ordnance Survey publishes a list of GIS computer aided design CAD and digital mapping system suppliers who have independently confirmed their software can import Ordnance Survey NTF format data 0 0 Boundary Line technical specification 0 v1 0 04 2007 Crown copyright Page 32 of 75 Chapter 1 Product contents Source of Boundary Line The main data sources used for the creation of Boundary Line are Ordnance Survey s 1 10 000 scale boundary record sheets and Landplan digital data Update currency Boundary Line is updated twice a year spring and autumn The updated product is a full replacement for all the listed administrative and electoral boundaries The represented boundaries and administrative unit names are defined and modified by Orders Acts and Statutory Instruments SI s Only changes that are operational from the 1st week of May in the current year of release will be included NOTE Orders Acts and 575 in exceptional circumstances due to processing or constitutional constraints may be excluded until the next suitable release Superseded boundaries Boundaries are no longer shown in Boundary Line if they have been superseded at the time of the annual snapshot of boundaries that each release of Boundary Line represents Census agency codes Revisions to census agency codes are incorporated into Bo
95. rd Order SOMERSET TAUNTON DEANE 03 May 2007 2007 146 Ward Order SOMERSET MENDIP 03 2007 2007 141 Ward Order WILTSHIRE NORTH WILTSHIRE 03 May 2007 2007 143 Ward Order WILTSHIRE WEST WILTSHIRE 03 May 2007 2007 323 Ward Order E isa 03 May 2007 2007 144 Ward Order BRADFORD 01 April 2007 2006 3417 Parish Order ESSEX CASTLE POINT 01 April 2007 2006 3467 Parish Order LEICESTERSHIRE 01 April 2007 2006 3469 Parish Order NORFOLK 01 April 2007 2006 3450 Parish Order WARWICKSHIRE RUGBY 01 April 2007 2006 3470 Parish Order SURREY TANDRIDGE 01 April 2007 2006 2499 Parish Order TORBAY 01 April 2007 2006 3280 Parish Order EAST SUSSEX WEALDEN 01 April 2007 2006 3468 Parish Order DURHAM WEAR VALLEY 01 April 2007 2006 3279 Parish Order BUCKINGHAMSHIRE WYCOMBE 01 April 2007 2007 65 Parish Order ESSEX BASILDON 01 April 2007 2007 333 Parish Order BUCKINGHAMSHIRE CHILTERN 01 April 2007 2007 332 Parish Order YORK 04 August N A N A Parish Name Change 2006 Rufforth to Rufforth with Knapton NOTTINGHAMSHIRE BASSETLAW 01 April 2007 N A N A Parish Name Change from Clarborough to Clarborough and Welham NORFOLK NORTH NORFOLK 01 April 2007 N A N A Parish Name Change from Corpusty to Corpusty and Saxthorpe WORCESTERSHIRE BROMSGROVE 01 April 2007 N A N A Parish Name Change from Stoke Prior to Stoke LEICESTERSHIRE BLABY CHA
96. relationship to a named area amalgamation or a change of name to an area are made by order string 1 Aset of items which can be arranged into a sequence according to a rule 2 Asequence of coordinate pairs or triplets making up a line or a link structured data Data within which collections of features of any type form objects Topographically structured data also contains topological information defining the relationships between features and objects terminator A character character string field or record used to signal the end of a record or section or volume or database topographic database A database holding data relating to physical features and boundaries on the surface of the Earth topography The study of the physical features of the Earth A topographic map s principal purpose is to portray and identify the features of the Earth topology The study of the properties of a geometric figure which are not dependant on position such as connectivity and relationships between lines nodes and polygons 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 transfer transfer medium The physical medium on which digital data is transferred from one computer system to another For example CD ROM transfer set
97. s 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 data quality Attributes of a dataset which define its suitability for a particular purpose for example completeness positional accuracy currency logical structure and so on dataset Data as supplied in a particular format to customers whether internal or external to Ordnance Survey 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 derived map A map which has been produced by reference to other source maps rather than directly from a survey digital Data which is expressed as numbers digits in computer readable form is said to be digital distinctive name A text feature consisting of text string s which form s a proper name eastings See rectangular coordinates entity Something about which data is stored in a databank or database For example boundary and name The data may consist of relationships attributes positional and shape information and so on Often synonymous with feature explicit Data that is directly represented in digital form For example the relationship between two objects is explicit if recorded by such means as pointers and does not have to be deduced by further analysis of the data
98. sponsibility 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 00 Boundary Line user guide preface v1 0 04 2007 Crown copyright Page 4 of 75 No part of this guide may be reproduced or transmitted in any form or by any means including electronically for commercial exploitation without the prior written consent of Ordnance Survey No part of this guide may be copied or incorporated in products services or publications that you generate for onward sale or as free promotional or support materials without the prior written consent of Ordnance Survey Data copyright and other intellectual property rights The Crown or where applicable Ordnance Survey s suppliers owns the intellectual property rights in Ordnance Survey digital map data Full details of the terms and conditions under which Ordnance Survey digital map data may be processed and or manipulated or copied by a customer whether or not for use on PCs or workstations or for making h
99. t OOUAPAR or 999999 lt S gt or lt 7S gt TY AC NM See note 3 below NB See note 4 below 0 or 1 Description Record descriptor Unique in file Cross reference to ATT_ID in Collect Record Mnemonic for ADMIN AREA ID attribute Unique in dataset number which is the Admin area ID 000000 for non areas Mnemonic for NON INLAND AREA Area of non land Mnemonic for CENSUS CODE attribute County census agency code See note 2 below District census agency code See note 2 below ED and or ward census agency code in district See note 2 below Parish census agency code See note 2 below Unitary census agency code See note 2 below Ward census agency code in unitary area See note 2 below Parish or community census agency code in unitary area See note 2 below Census agency code unavailable to Ordnance Survey No census agency code allocated Type of admin area or voting area AA or VA or FA for non area or TA for sea See note 5 below Code of admin area or voting area See note 6 below Mnemonic for NAME attribute See note 7 below Admin area name or sea Divider used to terminate variable length text fields Mnemonic for NON_TYPE_CODE optional Code for the non type that exactly matches this area No further records or continuation record follows Record terminator Boundary Line technical specification chapter 5 v1 0 04 2007 Crown copyright Page 58
100. ter parish scotland and wales const scotland and wales region westminster const Directory names for nested MID MIF England County European Region London Administration Metropolitan District Unitary Authority Westminster Consituency Scotland European Region Scottish Parliamentary Electoral Region Unitary Authority Welsh Assembly Electoral Region Westminster Constituency Wales district borough unitary european region high water parish scotland and wales const scotland and wales region unitary electoral division westminster const Wales European Region Unitary Authority Westminster Constituency NOTE See the user guide chapter 3 Relationships of administrative areas for a hierarchical relationship of the boundaries contained with these files and directories Boundary Line technical specification chapter 2 v1 0 04 2007 Crown copyright Page 37 of 75 Chapter3 ESRI shapefile An overview of Boundary Line in ESRI shapefile ESRI shapefiles are a simple non topological format for storing the geometric location and attribute information of geographic features A shapefile is one of the spatial data formats that you can work with in ArcGIS The shapefile format defines the geometry and attributes of geographically referenced features in as many as five files with specific file extensions that should be stored in the same project workspace They are shp the file that stores the feature geometr
101. ter constituency e electoral division of county or unitary authority e ward of district metropolitan district London borough unitary authority e London borough including the county of the City of London e Greater London Authority and e Greater London Authority Assembly constituency e n Wales e unitary authority e community NOTE depicted if appropriate notification has been received European Electoral region e parliamentary Westminster constituency e electoral division of unitary authority e Welsh Assembly constituency and e Welsh Assembly electoral region e n Scotland e unitary authority e European Electoral region e parliamentary Westminster constituency e ward of unitary authority e Scottish parliamentary constituency and e Scottish Parliament electoral region Area values Area values exist for every polygon in Boundary Line area values are quoted to the current Department for Communities and Local Government DCLG specification of 0 001 hectare The value is subject to the inherited accuracies of the generalised 1 10 000 scale published mapping used as the source for Boundary Line 0 0 Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 17 of 75 Boundary A boundary is the limit of a preset and established area whose limit is determined by one or more lines For example in Boundary Line an administrative unit boundary is represe
102. terminating nodes Links have no connection with other links except at the start or end via common shared terminating nodes points All links contain their terminating coordinates Links may form the boundaries of polygons and may be shared between polygons link and node data A form of vector data in which linear features are represented as links Links are terminated where they intersect other links These intersection points and link ends may carry nodes whose feature records express the geometric relationships between links link and node structure A data structure in which links and nodes are stored with cross referencing link segment A straight line or vector between two coordinated points logical record A logical record contains all the information relating to a data entity for example a feature record A logical record may comprise one or more physical records map generalisation A reduction in map detail so that the information remains clear and uncluttered when the 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 header Data at the start of the digital map file describing that data It may contain information on the source and history of the geometric data within the map and the coordinate system in use as well as holding information essential to the management of Ordnance Survey s digital mapping system map scale The ratio between
103. the extent of a feature on the map and its extent on the ground normally expressed as a representative fraction such as 1 1250 or 1 10 000 00 o MENENENENMNHNE R RORKNMNMNMNMNMNMNMNMNMNMNNNN Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 72 of 75 name The proper name or label of an object real world or feature object abstraction The descriptive name might consist of one or more text strings or be an attribute of the object or object abstraction National Grid A unique referencing system which can be applied to all Ordnance Survey maps of Great Britain GB at all scales It is used by Ordnance Survey on all post war mapping to provide an unambiguous spatial reference in Great Britain for any place or entity whatever the map scale The National Grid is defined by the OSGB369 spheroid NTF A format designed in 1988 specifically for the transfer of spatial information it is published as British Standard BS 7567 and is administered by the British Standards Institution see chapter 2 of the technical specification NTF explained node An object representation of a point which either does not form any part of a link isolated node or polygon seed point or the representation of a point at the start or end of a link terminating node The position of a node is defined by a single coordinate pair which is repeated within all links logically connected at that nod
104. the true position in space 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 is 1 metre but the accuracy may be 5 metres or worse section In NTF terminology a subdivision of a database In Ordnance Survey terms this equates to a single map unit that is a digital map file or a tile seed point A coordinated point isolated node within an area usually a defined polygon to which alphanumeric information may be attached as an attribute for example a name or feature code Also called a polygon Seed area seed or representative point segment A chord defined by two consecutive coordinates in a line string source scale The scale of the source information from which the map was digitised The scale of survey for a basic scale map or the scale of the source map for a derived map spatial data Data which includes a reference to a two or three dimensional position in space as one of its attributes It is used as a synonym for geometric data 0 Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 74 of 75 Statutory Instrument An order made by a Minister under delegated power from Parliament Contains changes to boundary information the alignment type or
105. the undetermined part of the southern boundary of Liverpool district in the Mersey estuary has been made coincident with the limits of that district s wards at the centre of the channel at high water CCHW 3 the undetermined part of the county boundary between Merseyside the former county of and Cheshire in that part of the estuary between the districts of Ellesmere Port and Neston and Liverpool has been made coincident with the limits of the electoral divisions at the centre of the channel at high water CCHW and 4 the northern limit of the parliamentary constituency of Ellesmere Port and Neston is the mean high water mark on the south side of the Mersey estuary The wards of Windsor Castle The Upper and Middle wards of Windsor Castle do not form part of the district of Windsor and Maidenhead but have been included for the purposes of this dataset Honorary titles Honorary titles granted to local government areas such as city and town are not included in Boundary Line Boroughs in England have been identified as from the October 2006 release with B in the file name and B in the Name attribute for example CITY SOUTHAMPTON File name CITY OF SOUTHAMPTON B NAME attribute The borough B will only be depicted on Unitary Authorities District and Metropolitan Districts A list of these boundaries and their borough status will be provided in the Doc Folder of the Boundary Line product CD This addition is to purel
106. ting 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 which identifies the polygon 00 Boundary Line technical specification annexe v1 0 04 2007 Crown copyright Page 73 of 75 polygon boundary The link s which enclose a polygon projected into the horizontal plane A chain polygon point See seed point positional accuracy The degree to which the coordinates define a point s true position in the world directly related to the spheroid and or projection on which the coordinate system is based precision The exactness with which a value is expressed whether the value be right or wrong record A set of related data fields grouped for processing rectangular coordinates Also known as X Y coordinates and as eastings and northings These are two dimensional coordinates which measure the position of any point relative to an arbitrary origin on a plane surface for example a map projection relative accuracy The measure of the internal consistency of the positional measurements in a dataset For many local area purposes for example records of utility plant relative accuracy is more important than absolute accuracy In this case accurate measurement of offsets from fixed points is required rather than knowledge of
107. undary Line as soon as practicable after the information is made available to Ordnance Survey Tide lines and rivers Additional coastline reconciliation with the Landplan product was introduced in May 2005 Changes to the Boundary Line tide lines plus natural and gradual changes to rivers and streams have been implemented along side the previous boundary coast association to enhance the MHW 0071 All boundary alignment changes in Boundary Line will be reported in the Change Update document accompanying each release of Boundary Line Resolution The resolution of the coordinate system is 0 1 m However it is not possible to calculate meaningful accuracy limits for Boundary Line data due to both the graphic nature and scale of the primary source 1 10 000 scale published mapping Such mapping is subject to limited map generalisation where an impression of the ground detail is made due to the complexity of the detail and importance of certain features such as roads This means that boundary alignments are cartographically represented in areas where accurate positional representation would be impossible Boundary Line is derived from the basic scale of 1 10 000 The relationship of boundaries to ground detail mirrors the accuracy achieved on the source Ordnance Survey 1 10 000 Landplan A consequence of this is if Boundary Line is superimposed upon boundaries in basic scales Land Line data variations in the two alignments will be seen C
108. ures Record COLLECT Record size NTF data is written to the media in variable length records with a maximum record length of 80 characters which includes any continuation mark CONT MARK and end of record EOR which should not to be confused with EOR meaning extent of the realm Record terminator EOR The end of record terminator is the percent character 96 ASCII code 37 for both formatted and unformatted media Other features Each polygon carries the following attributes PI polygon ID a number unique to the polygon for example 070087 and HA area of polygon recorded to a precision of 0 001 hectare Each link carries the following attributes where relevant LK link ID a number unique to the link for example 0000064368 and FC selected links carry feature code 0071 for MHW Each administrative area collection of polygon features carries the following attributes where relevant administrative unit ID a number unique to the administrative unit for example 024431 NM distinctive name of administrative unit for example Hampshire County OP census agency code provided by the Office of National Statistics England and Wales and the General Register Office for Scotland where available county district unitary authority ward and some electoral divisions only see chapter 3 Boundary Line explained for a full explanation TY the type of the non area for example VA meaning voting area AC code in
109. ute record to each polygon record NOTE If the polygon record is part of a complex polygon record then the polygon record does not reference an attribute record Complex polygon feature Each complex polygon feature is depicted by the use of the following records Complex Polygon Record CPOLY Polygon Record POLYGON and e Attribute Record ATTREC Each complex polygon feature is in the data only once More than one polygon record is required for each complex polygon record There is one attribute record to each complex polygon record Collection of features Each collection of features is depicted by the use of the following records e Collect Record COLLECT e Polygon Record either and POLYGON e Complex Polygon Record either CPOLY e Collect Record optional COLLECT and e Attribute Record ATTREC Boundary Line technical specification chapter 4 v1 0 04 2007 Crown copyright 49 of 75 The collection of features must have at least one polygon record or complex polygon record A collect record is a combination of zero to many polygon records and or zero to many complex polygon records and zero to many collect records There is one attribute record to each collect record Section body records Geometry Record contains the coordinate position s to 0 1 m of the feature Line features contain two to many pairs Geometry continuation records conta
110. y shx the file that stores the index of the feature geometry dbf the dBASE file that stores the attribute information of features When a shapefile is added as a theme to a view this file is displayed as a feature table sbn and sbx the files that store the spatial index of the features These two files will only exist if you perform theme on theme selection spatial joins or create an index on a theme s SHAPE field Structure of Boundary Line in shapefile Area features Area Features are Polygons with attributes added Link features MHW Links represent all linear features that is boundaries extent of the realm and mean high water springs mark All links are broken when they intersect with one another The first and last coordinate pairs in a link correspond exactly with the end coordinates of the adjoining link s Links may comprise up to several thousand line segments Coordinate system The coordinate system is National Grid NG The National Grid coordinates are to a resolution of 0 1 metre This is the resolution of the source data 2222 Boundary Line technical specification chapter 3 v1 0 04 2007 Crown copyright Page 38 of 75 Shapefile table structures Regions Polylines Title Type Title Type FID Object ID FID Object ID SHAPE Geometry SHAPE Geometry NAME Text CODE Text AREA CODE Text DESCRIPTO Text DESCRIPTO Text FILE NAME Text FILE NAME Text NUMBER Double NUMBER Double LINK
111. y denote which boundaries have Borough status in England without creating polygons or altering the specification in any way ss gs sese NN Boundary Line user guide chapter 3 v1 0 04 2007 Crown copyright Page 20 of 75 National boundaries The boundaries between England and Wales and England and Scotland are treated as county boundaries in Boundary Line which have been created from the local authority boundaries Census agency codes These codes are a unique system of referencing for administrative units The following types of unit are coded in Boundary Line where they have been made available counties districts metropolitan districts London boroughs unitary authorities district wards unitary authority wards and unitary authority EDs The codes are allocated by the Office of National Statistics ONS for England and Wales and by the General Register Office for Scotland GROS for Scottish areas NOTES The codes for Scotland were included for the first time in the 1997 release of Boundary Line The NTF OP record has a maximum of seven characters for the census codes In three tier local government hierarchy areas the format of the codes is a combination of two digits for county and two letters each for district and ward in the form CCDDWW see the following example codes or CCDDPAR for Parish census agency code Example codes for typical wards in Cheshire 13UBGU College ward 13UHGY Helsby ward 13UDGH Birchin ward

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