The National Elevation Dataset (NED) 1/3 Arc Second is a raster product assembled by the U.S. Geological Survey (USGS). NED 1/3 Arc second is designed to provide National elevation data in a seamless form with a consistent datum, elevation unit, and projection. Data corrections are made in the NED 1/3 Arc Second assembly process to minimize, but not eliminate, artifacts, perform edge matching, and fill sliver areas of missing data. This data set has been reprojected into Albers Equal Area at 30m resolution.