Terrain (DTM) & Surface (DSM) elevation models of river basins derived from airborne LIDAR
survey systems. A Digital Terrain Model (DTM) is a digital file consisting of a grid of regularly
spaced points of known height which, when used with other digital data such as maps or
orthophotographs, can provide a 3D image of the land surface. This data is typically provided in
tiles of 1km x 1km, each containing elevations in a 1m x 1m grid. Tiles are grouped and can be
downloaded by area as shown on the index ‘River Basin LIDAR-Coverage Map’. Data acquired in
2009 & 2010 also contains Point Cloud files, a closely spaced (0.2m) irregular grid of elevations
from which the 1m x1m grids were derived. By download or use of this dataset you agree to abide
by the Open Government Data Licence.
This data is not a supported LPS product, supporting documentation has been provided to assist /
offer guidance on the data itself.
