Hello all,
I used geoR package to compute kriging with krige.conv() , and to draw map I used contour() like this :
>contour(kc,locations, filled=TRUE, coords.data=geodata$coords,
>+color=terrain.colors)
And I want to limit the prediction inside data locations (with borders()) which are not rectangular, so how can I create a polygon which could contain my data? Or if someone knows where I can find polygons data frame for the states of the US?
Another question : the geodata$coords correspond to three states and is it possible to draw the point data in three different colors ? 
I hope someone understand my questions, and I thank you in advance!
Chloé Archinard
CEFE_CNRS Montpellier, France

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