Hi, I don't understand what the 'proj4string' argument in map2SpatialPolygons() does. map() in the maps package has a 'projection' argument:
,-----[ *help[R](map)* ] | projection: character string that names a map projection to use. See | 'mapproject' (in the 'mapproj' library). The default is to | use a rectangular projection with the aspect ratio chosen so | that longitude and latitude scales are equivalent at the | center of the picture. `----- so I don't know what projection was actually used in a given map() call with that default 'projection' argument. I suppose 'proj4string' in map2SpatialPolygons() should match the actual projection used in the map() call, shouldn't it? Thanks. Cheers, -- Seb
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