A new quality assessment report from NASA’s Commercial Satellite Data Acquisition (CSDA) program evaluates data from the Polar Geospatial Center’s (PGC) EarthDEM product. The results of the evaluation help inform NASA program management and the user community about the quality of commercial Digital Elevation Models (DEMs) for use in NASA science.
Issued August 8, 2026, the CSDA Polar Geospatial Center EarthDEM Quality Assessment Reportwas conducted by NASA Digital Elevation Model (DEM) subject matter experts (SMEs) enlisted to evaluate the horizontal and vertical accuracy of two PGC EarthDEM1 (i.e., Digital Elevation Model) products: the center’s “Mosaic Tile” and “Strip” Digital Surface Models (DSMs).
To assess the vertical and horizontal accuracy of the EarthDEM Strip DSM and Mosaic Tile products over a variety of surface characteristics, the SMEs compared them to airborne lidar data samples from across the United States and Senegal. They found the horizontal accuracy of the EarthDEM products (Strip DSM: 0.5-meter (m) Root Mean Square Error Horizontal (RMSEH); Mosaic Tile: 0.3 m RMSEH) agreed with the specifications provided by the PGC and graded them “Excellent.” The vertical accuracy results of the EarthDEM Strip DSM (5.6 m Root Mean Square Error Vertical (RMSEV)) and the Mosaic Tile (4.9 m RMSEV) products varied by land cover type, with all land cover types exceeding the specification provided by the PGC (0.5 m RMSEV). Strip DSM vertical accuracy was found to vary from 4.6-6.8 m RMSEV depending on the cloud cover metadata field generated by the PGC. Given this variation, the vertical accuracy compliance for the EarthDEM products was graded as “Basic.”
