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Original Product Resolution (OPR) Source Digital Elevation Models (DEMs) - USGS National Map 3DEP Downloadable Data Collection This data collection is the Original Product Resolution (OPR) Digital Elevation Model (DEM) as provided to the USGS. This source DEM is delivered in the original resolution, units and horizontal and vertical spatial references. These data may be used as the source of updates to the 3D Elevation Program (3DEP), which serves as the elevation layer of the National Map. Types: Citation; Tags: 3D Elevation Program, 3DEP, Bare Earth, Cartography, DEM, All tags... Digital Elevation Model, Digital Mapping, Digital Terrain Model, Elevation, GIS, Geodata, High Resolution, Hydro-Flattened, LIDAR, Light Detection and Ranging, Mapping, NED, National Elevation Dataset, Raster, Terrain Elevation, Topographic Surface, Topography, U.S. Geological Survey, US, USGS, USGS:1004ada7-1e9f-4fcf-adfb-677868b7317c, United States, elevation, Fewer tags