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Whitebox Geospatial Analysis Tools
Description: An open-source and transparent geographical information system (GIS) and remote sensing package that is flexible and powerful. This is the replacement for the much-used Terrain Analysis System (TAS).
TAS GIS (no longer supported but still available for download)
Description: a freely available geographical information system (GIS) for performing spatial analysis operations in the environmental sciences.
Reference: Lindsay, J. B. (2005), The Terrain Analysis System: A tool for hydro-geomorphic applications, Hydrol. Proc., 19(5), 1123–1130.
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