[R-sig-Geo] How to clip a map using shapefiles?

[Thiago Veloso]

  Dear r-siggers,
  Does anybody know how to clip, or cut a map using a previous loaded shapefile? To produce the attached map, I'm using the following code: image(lon,lat,testedec1[111:133,15:43],col=rainbow(10))par(new=T)plot(brazil)
  Where "brazil" is a shapefile loaded with maptools library. Is it possible to use this shape as a mask to filter the map values? The result would be only the values which are inside the contour...
  Thanks in advance,
  Thiago Veloso.


      
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