![]() However, owing to the fact that elevation differences in wetlands typically fall below or just into the range of contour intervals of standard topographic maps being generally 20 m, and 5m for some areas, the latter fail to give enough detail. They are of particular value in areas of comparatively flat topography, where such tasks are often difficult to perform. North-West University, Potchefstroom Campus, School of Environmental Science and Development, Private Bag X6001, Potchefstroom 2520, South Africaĭigital elevation models (DEM) generated in geographical information systems (GIS) have proven to be useful tools in hydrological research, aiding, amongst others, the delineation of catchment areas, identification of drainage patterns and flow pathways as well as for runoff determinations. Generating high-resolution digital elevation models for wetland research using Google Earth TM imagery an example from South Africa
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