Hi Gustavo,

depends on how your thematic maps are stored.
Give a look on SPATIAL / CRAN at
http://cran.r-project.org/web/views/Spatial.html

If your data is raster-based, try to give a look on raster package.

bests

milton

On Tue, Aug 25, 2009 at 7:20 PM, dalposso <gustavodalposso@hotmail.com>wrote:

>
> how to create a cross table to quantify the classes of two thematic maps?
>
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