Hi I'm not a geostatistic expert. I'm trying to interpolate raingauges precipitation measures using radar precipitation as covariate. The resulting field obtained by KED is filled of precipitation even over the sea where neither raingauges nor radar have measured precipitation. The result changes if I reduce the maximum distance of the variogram computation (i.e. 20 km), but I have no idea on what produces this change. Using 20 km of maximum distance the variogram shape is poor. The variogram shape is well defined starting from 50 km of maximum distance, but in this case the precipitation is spread over the sea . I didn't note any substantial difference changing the fitting model of the variogram: exponential, spherical or gaussian. Any suggestion? Anna
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