1/9th Arc-second Digital Elevation Models (DEMs) - USGS National Map 3DEP
          Downloadable Data Collection
This is a tiled collection of the 3D Elevation Program (3DEP) and is 1/9 arc-second
        (approximately 3 m) resolution.The 3DEP data holdings serve as the elevation layer of The
        National Map, and provide foundational elevation information for earth science studies and
        mapping applications in the …