USGS 3DEP Elevation Availability Index (NED) Overlay Map Service from The National Map - National Geospatial Data Asset (NGDA) National Elevation Data Set (NED)
The USGS 3D Elevation Program (3DEP) Index service from The National Map shows two general categories of downloadable elevation data: (1) digital elevation model (DEM) datasets at standardized horizontal resolutions, and (2) elevation source data including that used to produce standard DEMs, and additional datasets …