LIDAR DTM Time Stamped Tiles: Raster Terrain Elevation for England

LIDAR DTM Time Stamped Tiles is an archive of raster elevation data produced by the Environment Agency for England. Surveys began in 1998, with repeated coverage in areas like the coast, and data is available at resolutions of 25cm, 50cm, 1m, and 2m. The data represents the bare-earth terrain, is delivered in 5km GeoTIFF tiles, and has a vertical accuracy of +/-15cm RMSE.

Use Cases

• Flood risk modeling based on high-resolution bare-earth terrain data.
• Coastal change analysis using time-stamped surveys of the same location.
• Infrastructure planning and volumetric calculations from the Digital Terrain Model (DTM).
• Environmental monitoring of landforms and erosion using multi-temporal elevation data.

Strengths

• Provides multi-temporal coverage for specific areas, with surveys conducted since 1998.
• Offers high vertical accuracy, with all data having a root mean square error (RMSE) of +/-15cm.
• Available at multiple spatial resolutions (25cm, 50cm, 1m, 2m) to suit different project needs.

Limitations

• Spatial coverage is limited to site-specific surveys across England, not a complete national snapshot.
• Key metadata such as row count, file size, and specific license terms are not provided in the available sources.
• The transformation and geoidal model applied are specific to the survey time period, requiring user awareness.

Provenance

Source

Environment Agency

Collection Method

Site-specific LIDAR surveys, with data processed using bespoke algorithms and manual editing to create DTMs from the last return signal.

Time Range

1998 to present

Freshness

2026-04-07 14:26:56.110683

Geography

England, with specific sites and repeated coverage in coastal zones.