National Elevation Dataset
United States database of topographic data / From Wikipedia, the free encyclopedia
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The National Elevation Dataset (NED) consists of high precision topography or ground surface elevation data (digital elevation model) for the United States. It was maintained by the USGS and all the data is in the public domain. Since the 3D Elevation Program came online, the NED was subsumed[1] into The National Map as one of its layers of information.