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The development of a hydrologically improved Digital Elevation Model and derived products for South Africa based on the SRTM DEM
Expanded Title:Digital Elevation Models (DEMs) represent the topography in a landscape and are an important data source used in numerous hydrological and geo-hydrological studies/projects. There are several DEMs available for South Africa, but usually they require significant editing before they can be used for hydrological modelling. Therefore this project is an attempt to provide a readily usable set of data products for hydrological modelling. The aim of the project was to prepare a hydrologically improved Digital Elevation Model for South Africa from the Shuttle Radar Topography Mission (SRTM) DEM. The SRTM DEM provides a readily accessible resource that can be effectively exploited to guide regional planning especially in data scarce areas where prohibitive costs preclude the use of high resolution equivalents. Although the utility of the SRTM-derived DEM is incontrovertible, effective use of this dataset is constrained firstly by areas of missing data which are mostly associated with water bodies, mountainous areas and desert regions and secondly by occasionally elevated elevation values in flow paths caused by bridges, high trees with large crowns, steep cliffs etc. obscuring the flow path below. These ‘blockages’ in the data cause wrong flow path extraction and the formation of ‘inland lakes’ in the data. In very flat areas elevated elevation values can cause serious misrepresentation of large meandering rivers.
Date Published:01/01/2012
Document Type:Research Report
Document Subjects:Water Resource Management/IWRM - Catchment Management
Document Keywords:Hydrology
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1908/1/11
ISBN No:978-1-4312-0217-1
Authors:Weepener HL; van den Berg HM; Metz M; Hamandawana H
Project No:K5/1908
Originator:WRC
Organizations:ARC; IRIS International, Potchefstroom
Document Size:11 863 KB
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