Remko Duursma <remkoduursma <at> gmail.com> writes: > > Here is a different solution: > > library(gpclib) > p1 <- as(poly1, "gpc.poly") > p2 <- as(poly2, "gpc.poly") > > area.poly(p2) + area.poly(p1) - area.poly(union(p1,p2)) > > I.e., take areas of both polygons and subtract the union (check > plot(union(p1,p2)) ) to get the area of the intersection. > > greetings, > Remko
Thanks for the hint. I didn't know that the "polygon clipping library" has been packaged for R, I could have used it several time before. There are too many package, though this time I admit it would have been easy to hit upon it by searching CRAN carefully. Hans Werner Hans Werner ______________________________________________ R-help@r-project.org mailing list 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.
