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Homepage » Topographic » Slope


Slope represents the change of elevation over a specific area. Slope is generated from ⅓ arc-second Digital Elevation Models (DEM), previously referred to as the National Elevation Dataset (NED). The ⅓ arc-second DEM is part of the USGS 3D Elevation Program (3DEP), which provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and insular areas in a seamless format. The 3DEP ⅓ arc-second DEMs are derived from diverse source data, processed to a common coordinate system and unit of vertical measure.

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