1 Creating Geopak TIN Surfaces from USGS DEM Data This procedure provides a step by step process on using USGS 7.5-minute topographic maps and 10 meter DEM (digital elevation model) data to produce a Geopak digital terrain model or TIN file for use in drainage or preliminary roadway design using MicroStation and Geopak. The USGS Digital Elevation Model ... Each 7.5-minute DEM is based on 30- by 30-meter data spacing with the Universal Transverse Mercator projection. Each 7.5- by 7.5 ...
Mosaicked DEM files are distributed in 50 km x 50 km sub-tiles. Mosaicked DEMs are provided at 2-meter spatial resolution in 32-bit GeoTIFF format. Reduced resolution versions are also available at 10 meter, 32 meter, 100 meter, 500 meter, and 1 kilometer resolutions. Elevation units are meters and are referenced to the WGS84 ellipsoid.
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