 National Elevation Dataset

The National Elevation Dataset (NED) is a collection of elevation data created and maintained by the U.S. Geological Survey (USGS). It provides a high-resolution, consistent, and seamless representation of the Earth's surface elevation across the United States. The NED is built from various data sources, including satellite imagery, lidar, and traditional topographic maps, and it is available in multiple formats and resolutions to meet different user needs.