Dear list, I'd like to use the function smooth.map{maps} to smooth out aggregated spatial data. The first argument to this function must be a map object. I have a shape file which I read with readShapeSpatial{maptools} and I got an object of class "SpatialPolygonsDataFrame". Is it possible to create a map object from a SpatialPolygonsDataFrame object? Alternatively, is there any other function similar to smooth.map that will work with a SpatialPolygonsDataFrame? Thanks for any help, Axel. [[alternative HTML version deleted]]