How does NED compare to SRTM?
The Shuttle Radar Topography Mission (SRTM) digital elevation dataset were collected by a modified radar system that flew onboard the Space Shuttle Endeavor in February 2000, using a technique known as Interferometric Synthetic Aperture Radar to generate the most complete high-resolution digital topographic database of the Earth. SRTM data were collected for approximately 80% of the Earth’s surface. Read more about the mission at the SRTM homepage. The National Elevation Dataset (NED) is a raster product assembled by the U.S. Geological Survey. NED is designed to provide National elevation data in a seamless form with a consistent datum, elevation unit, and projection. Various source data are used in the generation of NED data as well as a wide range of production methods and source dates. The NED is a collaborative effort among the USGS and other Federal, State, and local partners to improve and deliver topographic information for the Nation. Additional information can be found at the
