Dear Jun
I think you should consider to submit your question to R-SIG (special
interest group) about spatial data 

http://r-sig-geo.2731867.n2.nabble.com/ 

This will improve the probability you get some help.

Cheers 

Giuseppe Calamita

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Giuseppe Calamita
PhD at CNR-IMAA Italian National Council of Research - Institute of 
Methodologies for Environmental Analysis,  Tito Scalo -Potenza ITALY
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