Tuesday 25 August 2015

hydrology - Is there hydrologically correct water-course data for Africa


I was wondering if there are any hydrologically correct river-channel data available for download for Africa?


By hydrologically correct, I mean





  1. the topology should be correct. Connected river reaches should be connected in the GIS file.




  2. there should be (ideally ) flow directions on the polylines reflecting real flow directions




I looked at VMAP0 data, the rivers are broken and disconnected like this:


enter image description here




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