Before revision: It is maintained by the USGS and all the data are in public domain Source The NED dataset is a compilation of data from a variety of existing high-precision datasets such as LiDAR data , contour maps, USGS DEM collection, SRTM and other sourcesNational Elevation Dataset FAQ, Sources .
After revision: (see also National LIDAR Dataset - USA)It is maintained by the USGS and all the data are in public domain Source The NED dataset is a compilation of data from a variety of existing high-precision datasets such as LiDAR data , contour maps, USGS DEM collection, SRTM and other sourcesNational Elevation Dataset FAQ, Sources .