[STATSGRASS] gstat: problem with prediction value at point location

[Edzer J. Pebesma]

This is a well-known property of kriging if locations coincide exactly: 
if measured, the best estimate is the measurement itself. It's also 
cause of the problem that you can't have duplicate observations in 
kriging. Even with a nugget, gamma(0)=0. You may want to shift your 
points or your grid e.g. a few centimeters to get rid of it.
--
Edzer

Jarek Jasiewicz wrote:
> Hi
> when I tested prediction values kirging result I found that values at 
> pixel exactly at point location has the same values as points. It 
> gives that in points appear thin peaks with values strongly different 
> from neigbours. It looks like gstat do not use prediction values but 
> used exact values.
> Variogram I used had the nugget
>
> Jarek
>
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