Author
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Daniel, John |
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Submitted to: American Society of Agronomy
Publication Type: Abstract Only Publication Acceptance Date: 10/26/1997 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: The use of many hydrologic computer simulations rely on Digital Elevation Models (DEM's) to provide information for delineation of watershed boundaries and provide necessary hydrologic parameters. DEM's consist of a regular array of ground surface elevations referenced horizontally in the UTM coordinate system, but depending on the method of derivation the general data quality characteristics can vary. DEM's exist in two levels of quality: levels 1 and 2. Level 1 DEM's have a Root Mean Square (RMS) tolerance of 7m, however, values up to 15 m are permitted while Level 2 have a maximum RMS error of 1/2 a contour interval. Therefore, use of Level 1 DEM's to delineate watershed boundaries and calculate parameters may produce questionable and suspect results. In this paper a comparison of boundary delineation of Level 1, Level 2, and constructed DEM's of small watersheds containing closed depressions will be discussed. A comparison of hydrologic parameters of the different watersheds will also be covered. |
