Ordnance Survey – Great Britain's national mapping agency
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Technical Information
| Specification | Land-Form PROFILE | ||
| Contours | DTM | ||
| Tiles in series | 10 575 | 10 549 | |
| Data structure | Vector point and line | Point | |
| Feature codes/layers | 6 | 1 | |
| Height Accuracy |
Areas with 5m vertical interval | + or - 1.0m | + or - 2.5m |
| Areas with 10m vertical interval (mountain and moorland) |
+ or - 1.8m | + or - 5.0m | |
| Storage Volumes |
NTF | Average: 1.2Mb Maximum: 2.8Mb |
1.5Mb |
| DXF* | Average: 4.0Mb Maximum: 9.5Mb |
19.5Mb | |
| Data source | Contours surveyed at 1:10 000 scale | ||
| Availability | National cover | ||
| Tile coverage | 5 km by 5 km | ||
| Transfer format |
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* Due to large file sizes, orders for DTMs in DXF format are limited to 1,000 tiles.
Sample data
The following self-extracting archives of data are available for download:
- Contours tile SS78NE (DXF release 12)
- Contours tile SS78NE (NTF)
- DTM tile SS78NE (DXF release 12)
- DTM tile SS78NE (NTF)
If you haven't downloaded or used sample data before, we recommend that you read our guidance notes.
User guide
The user guide contains information on the technical specification and product specification for Land-Form PROFILE to help you understand how to use the data.
Land-Form PROFILE user guide (Version 4, May 2001), PDF format.