For the datasets listed below, pre-computed raster data are available from OpenTopography. These data include digital elevation model (DEM) layers computed from aerial lidar surveys and raster data from the Satellite Radar Topography Mission (SRTM) and other global datasets. DEMs from aerial lidar surveys are available as Digital Terrain Model (DTM), Digital Surface Model (DSM), or intensity (strength of laser pulse) tiles. Some datasets also have orthophtotographs available. All raster data can be output in common GIS formats and are compressed to reduce their size.
For information on the size of the datasets above see our dataset metrics page
and for usage information see our usage metrics page