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From the U.S. Geological Survey's National Map: "Bare earth digital elevation model (DEM) data from the NED, previously available through the Seamless Server Viewer, is accessed in The National Map Viewer with the 'Download Data' tool. Use the following procedures to download DEM data: Zoom to your area of interest. Click the Download Data tool near the top right corner of the viewer banner. Use the current map extent, choose a reference area polygon from the Download options dropdown menu, or create your own custom polygon. Select the data theme of Elevation and product format. Select available NED products, such as 2 arc-second (Alaska only), 1 arc-second (conterminous U.S., Hawaii, Puerto Rico, portions...
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