Ordnance Survey – Great Britain's national mapping agency
![Ordnance Survey home page [logo]](/images/gui/logo-os.gif){kind=logo}
Technical information
|
Specification |
Boundary-LineTM |
|||
|
Coverage |
Great Britain, (England, Scotland and Wales) |
|||
|
Availability |
Order by:
|
|||
|
Data source |
Boundary-Line original source compilation is the boundary alignments, textural descriptions contained in the Statutory Instruments and is digitised against 1:10 000 scale raster mapping. |
|||
|
Data structure |
Vector |
|||
|
Scale |
All boundaries depicted in Boundary-Line are captured and maintained against a generalised 1:10 000 scale raster product |
|||
|
Transfer format |
National Transfer Format (NTF) v2.0 Level 3 [BS 7567] ESRI® Spatial data format (Shapefile) MapInfo® Interchange format (MID/MIF) |
|||
|
Number of files in series |
Great Britain |
England |
Scotland |
Wales |
|
824 |
656 |
100 |
68 |
|
|
Storage volumes NTF Shapefile-nested* Shapefile-layered** MID/MIF-nested MID/MIF -layered (approximate) |
469.9 Mb 763.5 Mb 756 Mb 856.5 Mb 851.2 Mb |
197 Mb 417 Mb 409 Mb 469 Mb 467 Mb |
244 Mb 305 Mb 300 Mb 334 Mb 331 Mb |
39.9 Mb 62.5 Mb 62 Mb 71.7 Mb 71.2 Mb |
|
Supply media |
CD |
|||
|
Coordinate resolution |
The coordinates of Boundary-Line are stored to decimetre precision (0.1m) |
|||
|
Standard supply interval |
Once every 12 months (either spring or autumn release) |
|||
|
Update Interval |
Boundary-Line is revised twice a year and is released as a fully updated product each spring (May-NTF/ June-ESRI & MapInfo) and autumn (October NTF/ November ESRI & MapInfo), showing boundaries as at the first week of May of the year of release |
|||
|
Styling |
A separate symbol set is not supplied with this product |
|||
|
Geometric types |
Polygons |
|||
|
Coordinate reference system |
British National Grid (OSGB36 ®) |
|||
|
Unique identifier |
Persistant unique identifiers (PUI's)are provided with Boundary-Line |
|||
* 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 and county ED contained within. Unitary authority will have named unitary authority, unitary authority ward or unitary authority ED as appropriate, civil parish where appropriate, together with community in Wales.
** Layered; This is a simplified file structure supplying the boundaries as individual files, e.g. Parish layer contains only parishes and MHW only has the mean high water feature.
ESRI is a registered trademark of Environmental Systems Research Institute, Inc.
MapInfo is a registered trademark of MapInfo Corporation.
Borough update
Boundary-Line has a small addition to the text string and NAME field.
_(B) will be located on the file name and (B) will be found on the data name.
e.g. Unitary Authority
CITY_OF_ SOUTHAMPTON_(B) = File name
CITY OF SOUTHAMPTON (B) = NAME attribute
This addition is to purely denote which boundaries have Borough status in England without creating polygons or altering the specification in any way. It is similar to a spelling or name correction, which does not change the structure or specification of the product, and therefore it should not affect your GIS or translation software.
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 Data Folder of the Boundary-Line CD.
Sample data
The following data is available for download:
- Boundaries relating to the Wirral - NTF
- Cheshire Nested MidMif
- Cheshire Nested Shape
- Cheshire Layered MidMif
- Cheshire Layers Shape
User guide
The user guide contains information on the technical specification and product specification for Boundary-Line to help you understand how to use the data.
Boundary-Line user guide Version 1.4 (1.3 MB) PDF