Have a look at:
*akima <http://cran.r-project.org/src/contrib/akima_0.3-4.tar.gz>: Interpolation of irregularly spaced data*
Linear or cubic spline interpolation for irregular gridded data
Kris
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http://perswww.kuleuven.ac.be/~u0027178/VCard/mycard.php?name=krisn
http://gloveg.kuleuven.ac.be/
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