Lidar data, similarly to 5m Height Data, are provided in the form of a regular grid of points at 1 or 2m intervals with +/- 0.15m vertical accuracy.
Each point has X, Y and Z coordinates in the British National Grid represented as 6 + 2 digits that gives theoretical positioning precision of 0.01m. For example 530871.00 (X), 189359.00 (Y), 23.51(Z).
Digital Surface Model (DSM) – is a topographic model of the earth’s surface that includes buildings, vegetation, roads, and natural terrain features. The key benefit of the DSM is that it provides a geometrically correct base map.
Digital Terrain Model (DTM) – is a topographic model of the bare earth that has had vegetation, buildings, and other cultural features digitally removed, enabling users to infer terrain characteristics possibly hidden in the DSM.
Unfortunately at the moment there is only coverage for most of the major cities. For towns and rural areas our 5m height data may prove sufficient.
Prices start at £25 + vat for 200 metres x 200 metres of coverage.
To view dxf samples customers must have a version of CAD/Microstation/Vectorworks e.t.c.
Stanfords Geostore Lidar DTM (dxf) (3.5 MB)
Stanfords Geostore Lidar DSM (dxf) (3.5 MB)