When we extract drainage from DEM in the areas occupied by reservoir, lake etc. we are not getting correct drainage pattern. In these areas we get straight lines in the water body areas. How to get correct drainage pattern in these areas? Also how to get topography of the ground below water bodies? Can we get these information from DEM by any image processing method?
hi
i note that in some modeling systems, like Watershed modeling system, that it should add a reservoir if you has a lake. for the topographic corrections of the lake; I think it should directly measured in many cross sections by Dipmeters then it the dem should transfer into contours map and then the actual elevations of the lake could be delineate by modifying the contours lines (this is possible in wms).
The straight lines arise from the hydrological correction of the DEM (which you performed, I assume). There is a different approach using an unmodified DEM and a least cost path algorithm for routing through the DEM. This approach is implemented in GRASS GIS. Depending on your application this might be worth to check.
For an overview you can check a conference paper of us (and the references in it).
Conference Paper Channel Network Derivation from Digital Elevation Models – A...
Of course, this approach also does not give you the bathymetry of the water bodies, but maybe is a small step in the right direction...
Florian
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