I used grass gis v.surf.rst function to interpolate a surface using vector points. But it is very difficult to find a optimum parameters to be used. I am still unable to develop a accurate terrain

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    Welcome to gis.stackexchange! Please note that a good question on this site is expected to show some degree of research on your part, i.e. what you have tried and - if applicable - code so far. For more info, you can check our faq. – underdark Feb 6 '16 at 22:27

At first, as you did not tell, you want to create a raster form the points. A similar question about this can be found here: How can I create a DEM from Point Data? Second, I think there are tools in grass, callable from qgis, to make a depressionless dem, like the r.fill.dir tool. Other GIS-people tend to use saga gis functions, as described here: http://www.saga-gis.org/saga_module_doc/2.1.3/ta_preprocessor_4.html. For myself I always used arcgis functions from hydrology toolbox.

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  • I used grass v.surf.rst function to interpolate raster from points.But it is difficult to find optimum parameters to be used and i am still unable to develop an accurate terrain – Thilina Feb 7 '16 at 14:23

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