A lake is a body of relatively still water of considerable size, localized in a basin, that is surrounded by land apart from a river, stream, or other form of moving water that serves to feed or drain the lake. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and ...

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Lake Victoria bathymetric data

I am trying to find bathymetry for Lake Victoria (or portions). Any GIS format and almost any resolution will do. As a last resort a hydrographic chart will suffice.
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Whats the best way to create bathymetric contour lines?

I have a raster dataset with both Topographic and Bathymetric stored in it. What is the best way to create exact contours of the lake-bed? This becomes tricky when I want to make the contour for depth ...