Hi Marco,
a small example will be helpful to get better to the point.
But I suggest you either to address this question to 
R geo mailing list
 https://stat.ethz.ch/mailman/listinfo/r-sig-geo
and eventually take a look to GeoXp library.

Cheers

Anna

 
Anna Freni Sterrantino
Department of Statistics
University of Bologna, Italy
via Belle Arti 41, 40124 BO.


________________________________
 Da: marco milella <vrukol@gmail.com>
A: r-help@r-project.org 
Inviato: Domenica 14 Ottobre 2012 12:02
Oggetto: [R] plotting principal components on geographic map

Dear all,
I have a dataset representing several geographical points (locations), each
one having a specific value after performing a PCA.
Now I'm trying to understand how to separately represent on a geographic
map (of Europe) the pattern of PC1,2, ecc.with colors (e.g.heatmap)
I have to add that the dataset includes relatively few points. Therefore, I
would also like to interpolate the values for the uncovered geographical
areas.
Thanks in advance for any feedback,

best
marco

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