> I have two sets of points for which I've already determined which ones points > for the boundaries with the chull function. What I need for what I'm doing is > the coordinates where the two resulting polygons overlap.
There's a relevant answer on mathoverflow that might help if you're thinking of writing code: see http://mathoverflow.net/questions/130577/how-to-find-overlap-between-two-convex-hulls-along-with-the-overlap-area. The other 'obvious' approach is to find one of the various shapefile packages in R, convert your chull to such an object and use something like gIntersection() from rgeos or intersect from raster (see http://gis.stackexchange.com/questions/140504/extracting-intersection-areas-in-r) S Ellison ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
