[GRASS-user] Cross-validation output

[Casagrande Luca]

Hello everybody,

I am using v.surf.rst to interpolate a bathymetry survey. Following the
examples on the 3rd Grass Book, I have 
interpolated the results from the cross-validation procedure to check if
there are areas that need a more accurate sampling.
Most of the surface is ok, but there is a small area where the difference is
very high; you can check it out from this picture:

http://www.thebighouse.biz/data_cv.png

The issue is that there are bigger zones with no points that show a lower
difference value.
Why this?

Thank you very much for your help.
Luca
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