If a tile crosses two UTM zones, it is delivered in both zones. The spatial reference used for tiles of the one-meter DEM within the conterminous United States (CONUS) is Universal Transverse Mercator (UTM) in units of meters, and in conformance with the North American Datum of 1983 (NAD83).Īll bare earth elevation values are in meters and are referenced to the North American Vertical Datum of 1988 (NAVD88). One-meter DEM surfaces are seamless within collection projects, but, not necessarily seamless across projects. USGS standard one-meter DEMs are produced exclusively from high resolution light detection and ranging (lidar) source data of one-meter or higher resolution. The elevations in this DEM represent the topographic bare-earth surface. Scientists and resource managers use 3DEP data for hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. Lidar point cloud data is also available over many areas of the US. Raster datasets include: Digital Elevation Models (DEMs), Orthoimagery, and Land Cover. The vector datasets include: The National Hydrography Dataset(s), Watershed Boundary Dataset, Governmental Boundary Units, Transportation, Structures, Elevation Contours and Geographic Names. If you have any more question, please contact.
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