#DTM DIGITAL TERRAIN MODEL MANUAL#

Available to download as GeoTiff files in 5km grids, data is presented in metres, referenced to Ordinance Survey Newlyn, using the OSTNвЂ™15 transformation.

#DTM DIGITAL TERRAIN MODEL MANUAL#

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.

Dtm digital terrain model