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Author: Matthew M McPherson 609 Second Street Phone: (530) 756-1104 The U.S. Army Corps of Engineers Hydrologic Engineering Center and Sacramento District prepared USGS 30-meter DEMs for a study of the 55,000-square-mile Sacramento/San Joaquin basin. The authors' experiences show that the quality and accessibility of GIS data for hydrologic modeling are improving, as are the hardware and software necessary to process it. However, the day of bringing terrain-based modeling to the great unspecialized masses hasn't yet arrived. Problems to overcome include downloading and processing around 3,000 7.5' SDTS DEMs, with disparate units and vertical datums, and manually screening and editing them into shape for drainage analysis. |
