Ah ha. Even on the order of distance I'm working with, I lose one 30x30m pixel for a 4000m buffer around a point. So this question is something of a moot point. -- View this message in context: http://r-sig-geo.2731867.n2.nabble.com/extract-in-the-raster-package-tp7284748p7285124.html Sent from the R-sig-geo mailing list archive at Nabble.com.