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The United States Geological Survey's 3D Elevation Program (3DEP) provides a tiled collection of bare-earth topographic data covering the conterminous United States, Hawaii, Puerto Rico, other territorial islands, and much of Alaska and Canada. The seamless 1/9th arc-second (approximately 30-meter) resolution DEMs are derived from diverse source data, processed to a common coordinate system (NAD 83) and vertical datum (NAVD 88), with all elevation values in meters. This collection serves as the foundational elevation layer for The National Map and is updated continually as new data become available.
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