[Gvsig_english] Sum a raster within polygon boundaries

[Zi]

Hi all,

I'd like to sum the values of a raster set that fall within the boundaries
of polygons and assign those values as attributes to the polygon shapefile.
I used "grid statistics in polygons" (Sextante), but the result was the avg
-, min- and max-value (not the sum!). 

Does anyone know, how to calculate the sum?

Thanks!!



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