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I thinh spproj is not available for Mac Users ? > rSpatial = "http://r-spatial.sourceforge.net/R" > install.packages("spproj", repos=rSpatial) Avis : unable to access index for repository http://r- spatial.sourceforge.net/R/bin/macosx/powerpc/contrib/2.3 Avis dans download.packages(pkgs, destdir = tmpd, available = available, : no package 'spproj' at the repositories > Jacques Vernin