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National Elevation Dataset (NED) products are staged at resolutions of 1 arc-second (about 30 meters) and 1/3 arc-second (about 10 meters), and are available in either ArcGrid, GridFloat, or IMG formats in 1x1 degree tiles in The National Map Viewer. NED products at 1/9 arc-second (about 3 meters) resolution are staged only in IMG format in 15x15-minute tiles. For dynamic extracts of NED to include other formats, such as GeoTIFF or BIL_16INT, use the Multi-Resolution Land Characteristics (MRLC) Viewer. The default output format for NED in the MRLC Viewer is ArcGrid but you can then modify the data request to change to other formats prior to download.
Learn more: Data Delivery Updates - NED