摘要: Digital elevation models (DEMs) are frequently used for hydro-geomorphic applications involving overland flow routing. These applications are sensitive to the occurrence of elevation errors that result in spurious depressions because flow directions are indeterminate at depression bottoms. Therefore, in effect, simulated overland flow becomes" trapped" within digital depressions. It is a common practice to remove all depressions (ie, artifact and actual) and enforce uninterrupted flow paths. This dissertation considers the appropriateness of this practice by (1) comparing methods for distinguishing artifact from actual depressions,(2) determining the prevalence of artifact depressions in DEMs,(3) evaluating the impacts of the removal of artifact depressions to the DEM and its derived attributes, and (4) examining the importance of actual depressions in DEMs used for hydrological purposes. The comparison of methods …
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