Findings on the latest research results regarding the reduction of distributed subcatchment properties into a representative value for the subcatchments are also presented. These include the identification of drainage in the presence of pits and flat areas in the DEM, the determining role of channel source definition in drainage network configuration, and network analysis capabilities for raster networks. Issues related to the automated extraction of topographic and drainage information from DEMs are presented. Specifically, data availability, quality and resolution are discussed from an application perspective. ![]() The capabilities and limitations of DEMs for use in water resources model applications are reviewed. ![]() The automated extraction of topographic parameters from DEMs is recognized as a viable alternative to traditional surveys and manual evaluation of topographic maps, particularly as the quality and coverage of DEM data increases. Topography plays an important role in the distribution and flux of water and energy within natural landscapes. Digital Elevation Model Issues in water resources Modeling
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