Hi Rolf, Thanks for the feedback, I am indeed using the 'spatstat' package and now have the info I need. Thanks again, Sam -- View this message in context: http://r.789695.n4.nabble.com/Idetntifying-nearest-topographic-contours-to-data-points-tp3452462p3454680.html Sent from the R help mailing list archive at Nabble.com.