LIDAR Composite DTM 2017: 50cm Digital Terrain Model of England

2017 LIDAR Composite DTM (Digital Terrain Model) is a raster elevation model covering areas of England at 50cm spatial resolution. Produced by the Environment Agency, it is derived from a merged and re-sampled archive, using the newest, best resolution data from repeat surveys. The data has a vertical accuracy of +/-15cm RMSE and is available in 2km grids.

Use Cases

• Terrain analysis and hydrological modeling based on the 50cm resolution Digital Terrain Model.
• Integrating elevation data for infrastructure planning based on the +/-15cm vertical accuracy.
• Creating shaded relief visualizations based on the available WMS feed.
• Tracking survey provenance for specific locations based on the available Time Stamped survey index files.

Strengths

• 50cm spatial resolution provides detailed terrain data.
• Vertical accuracy of +/-15cm RMSE ensures reliable elevation measurements.
• Composite is updated annually to include the latest survey data.
• Data is derived from a full time-stamped archive merged for best coverage.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Row count is unknown, which may limit suitability assessment.
• The dataset is noted as no longer available on the original platform, requiring users to find a new version.

Provenance

Source

Environment Agency, United Kingdom.

Collection Method

Derived from airborne LIDAR surveys, with bespoke algorithms and manual editing to remove surface objects from the Digital Surface Model.

Time Range

2017 (composite), with annual updates incorporating newer surveys.

Freshness

Composite is updated annually; the base dataset is from 2017.

Geography

Areas of England.