Attribution statement: © Environment Agency copyright and/or database right 2015. exporting of digital terrain models (DTMs) with different formats and coordinate. This metadata record is for Approval for Access product AfA458.Īttribution statement: (c) Environment Agency copyright and/or database right 2020. The Environment Agency’s open data LIDAR archives includes the Point Cloud data, and derived raster surface models of survey specific areas dating back to 1998 and composites of the best data available in any location. The Digital Terrain Model (DTM) product is an image file that represent elevations for an area imaged in stereo by HiRISE. This document describes the DTM standard products. Up to 500,000 measurements per second are made of the ground, allowing highly detailed terrain models to be generated at spatial resolutions of between 25cm and 2 metres. An additional, derived product is produced from HiRISE stereo image pairs: 3) Digital Terrain Model (DTM) Products. Light Detection and Ranging (LIDAR) is an airborne mapping technique, which uses a laser to measure the distance between the aircraft and the ground. All LIDAR data has a vertical accuracy of +/-15cm RMSE. Available to download as GeoTiff files in 5km grids, data is presented in metres, referenced to Ordinance Survey Newlyn, using the OSTN’15 transformation.
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. The DTM (Digital Terrain Model) is produced from the last return LIDAR signal. Please refer to the survey index files which shows, for any location, what Time Stamped survey or National LIDAR Programme block went into the production of the LIDAR composite for a specific location. The 2019 LIDAR Composite contains surveys undertaken between 6th June 2000 and 1st September 2019. Where data was resampled a bilinear interpolation was used before being merged. Where repeat surveys have been undertaken the newest, best resolution data is used.
Produced by the Environment Agency in 2019, this dataset is derived from a combination of our Time Stamped archive and National LIDAR Programme, which has been merged and re-sampled to give the best possible coverage. The LIDAR Composite DTM (Digital Terrain Model) is a raster elevation model covering >80% of England at 1m spatial resolution. New version of this dataset, published in June 2020 is available here: This dataset is no longer available on the Data Services Platform.