Michel, In addition to the comments that have already been made, there is an example of overlying results (IDW, but kernel estimation can be done in a similar way) here:
http://www.asdar-book.org/book/die.R Look at chunks 41 to 44. Hope this helps. Virgilio _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
