GeoPerspectives DTM & DSM
Digital Surface and Digital Terrain Models are being produced from aerial photography, with urban areas captured using LiDAR technology so available at a higher accuracy and resolution. Our DSM and DTM are the first elevation models to include buildings and vegetation heights.
These products, which are Crown copyright free, can be delivered in a file format of your choice so are easily integrated into your GIS.
| DSM Feature |
Digital Surface Models |
|
| |
National Perspectives |
Urban Perspectives |
| Resolution |
2m |
1m |
| Coverage Status |
England & Wales 5 year capture programme |
Areas with population >100,000
Many available now |
| Accuracy XY RMSE |
1m |
50cm |
| Accuracy Z RMSE |
1.5m |
25cm |
| Optimum Viewing Scale |
1:5,000 |
1:5,000 |
| Update Programme |
Every 5 years |
Every 5 years |
| DTM Feature |
Digital Terrain Models |
|
| |
National Perspectives |
Urban Perspectives |
| Resolution |
5m |
1m |
| Coverage Status |
Full England & Wales coverage available from October 2006 |
Areas with population >100,000
Many available now |
| Accuracy XY RMSE |
1m |
50cm |
| Accuracy Z RMSE |
1.5m |
25cm |
| Optimum Viewing Scale |
1:10,000 |
1:1,000 |
| Update Programme |
Every 5 years |
Every 5 years |
From 2005 onwards, a new generation of DTM and DSM will be rolled out with a resolution of 1m (for the DSM) and increased accuracy.
|
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