Ordnance Survey – Great Britain's national mapping agency
![Ordnance Survey home page [logo]](/images/gui/logo-os.gif){kind=logo}
| Tiles in series | 10 548 | |
| Data structure | Point | |
| Height accuracy (Route Mean Square Error) |
Data source - recent LiDAR | +/- 0.25 m or better |
| Data source - recent photogrammetry | +/- 0.5 m or better | |
| Base data* | +/- 2.5 m (10m in mountain and moorland) | |
| Resolution | Data source - recent LiDAR and photogrammetry | 2 m |
| Base data* | 10 m | |
| Storage volumes per tile | NTF | 5 Mb compressed 40 Mb uncompressed |
| DXFTM** | 18 Mb compressed 1 Gb uncompressed |
|
| ArcGRID | 12 Mb compressed 60 Mb uncompressed |
|
| Data source | LiDAR, photogrammetric capture, Land-Form PROFILE | |
| Availability | GB coverage | |
| Tile size | 5 km by 5 km | |
* Base mapping is the existing Land-Form PROFILE data that will exist where no higher accuracy data has been ingested.
** Due to large file sizes, orders for DTMs in DXF format are limited to 1,000 tiles.
Sample data
By downloading the following data you agree to be bound by the 'Discover' Data Licence terms and conditions
Sample data is available in the following zipped archives:
TF16SE NTF (9.04 Mb; NTF files)
TF16SE ArcGrid (7.41 Mb; ArcGrid files)
TF16SE DXF (29 Mb; DXF files)
If you haven't downloaded or used sample data before, we recommend that you read our guidance notes.
User guide
The user guide (PDF) contains information on the technical specification and product specification for Land-Form PROFILE Plus to help you understand how to use the data.
DXF is a trademark of Autodesk Inc.