![]() ![]() ![]() These derived DEMs were used as terrain inputs for performing spatial analysis and obtaining derivative products. In the study two categories of DEMs were developed with 5 m contour and planimetric topographic data bare earth DEM and built environment DEM. This paper explores the use of contour data and planimetric features extracted from topographic maps to derive digital elevation models (DEMs) for watershed delineation and flood impact analysis (for emergency preparedness) of part of Accra, Ghana in a GIS environment. Geographical Information Systems (GIS) and Digital Elevation Models (DEM) can be used to perform many geospatial and hydrological modelling including drainage and watershed delineation, flood prediction and physical development studies of urban and rural settlements. ![]()
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