National Elevation Dataset
http://dbpedia.org/resource/National_Elevation_Dataset
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 came online, the NED was subsumed into The National Map as one of its layers of information.
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National Elevation Dataset
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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 came online, the NED was subsumed into The National Map as one of its layers of information.
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1608