LIDAR DTM Time Stamped Tiles

The LIDAR DTM (Digital Terrain Model) Time Stamped Tiles product is an archive of raster elevation data produced by the Environment Agency. Site specific surveys have been carried out across England since 1998, with certain areas, such as the coastal zone, being surveyed multiple times. Data is available at varying resolutions of 25cm, 50cm, 1m and 2m, depending on project requirements.

The DTM (Digital Terrain Model) is produced from the last return LIDAR signal. We remove surface objects from the Digital Surface Model (DSM), using bespoke algorithms and manual editing of the data, to produce a terrain model of just the surface. Available to download as ASCII files in 5km zips, data is presented in millimeters, referenced to Ordnance Survey Newlyn and data aligned to the OS Grid. All LIDAR data has a vertical accuracy of +/-15cm RMSE. The transformation used on the data is specific to the time period of survey. You can also download survey index files which show, for any location, what Time Stamped data is available, the specific dates of survey, resolution of product and what transformation and geoidal model used.

Light Detection and Ranging (LIDAR) is an airborne mapping technique, which uses a laser to measure the height of the terrain and surface objects on the ground such as trees and buildings. Hundreds of thousands of measurements per second are made of the ground allowing highly detailed elevation models to be generated at spatial resolutions of between 25cm and 2 metres.

To find out more about LIDAR and the various surface models we produce please read our story map

This metadata record is for Approval for Access product AfA457. Attribution statement: © Environment Agency copyright and/or database right 2019. All rights reserved. Attribution statement: © Environment Agency copyright and/or database right 2019. All rights reserved.