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National Elevation Dataset The National Elevation Dataset (NED) is the primary elevation data product of the USGS. The NED is a seamless dataset with the best available raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data. All NED data are public domain. The NED is derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. NED data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). All elevation values are in meters and, over the conterminous United... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: DEM, Digital Elevation Model, NED, NPLCC, National Elevation Dataset, All tags... United States Geological Survey, usgs, Fewer tags