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Ordnance Survey grid reference (2 to 10 digits), latitude and longitude, or eastings and northings.
Move and zoom the map to place the dashed frame. The data credits are always printed on the image, as the licences require.
Terrain. 1 m open LiDAR digital terrain models, merged and resampled to 100, 200, 400 and 800 m grids on the British National Grid: Environment Agency LiDAR Composite DTM (England); Welsh Government LiDAR DTM via DataMapWales (Wales); Scottish Government, SEPA, HES and OIC LiDAR via the Scottish Remote Sensing Portal (Scotland). Open Government Licence v3.0.
Gaps. Where no open LiDAR exists (parts of the Highlands and Islands, the Isle of Man) the terrain is GEM-15 v1, an experimental 15 m bare-earth model produced by Google from satellite imagery, CC BY 4.0 (Batchu et al. 2026).
Coast and water. Land is clipped to mean high water and inland water and foreshore are taken from OS Open Zoomstack. Contains OS data © Crown copyright and database right 2026.
Geology. BGS Geology 625k (DiGMapGB-625) bedrock, coloured by period with the international chronostratigraphic chart colours. Contains British Geological Survey materials © UKRI. Open Government Licence v3.0.
Method. Hillshade from central-difference slopes with a weighted four-direction sun (or a single sun), on a hypsometric tint. Heights are shown to 0.25 m. The finest grid here is 100 m; for the full 1 m LiDAR open LiDAR Lens.
Downloads and tiles. Ready-made images of the whole of Great Britain and Web Mercator base-map tiles: github.com/TimDaw37/gb-relief. Maps CC BY 4.0.
Tim Daw · sarsen.org
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