You can do this with rgeos and the gBuffer function. The package is available on cran as a binary for windows or can be installed from source on OSX or linux if you have the geos library installed. -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/polygon-buffer-tp6343166p6343195.html Sent from the R-sig-geo mailing list archive at Nabble.com.