Re: [R] Creating polygons from scattered points

2012-03-14 Thread Keith Jewell
No time to really think about this, but: a) to "convert scattered point distributions to polygons" you might look at convex hulls; e.g. convhulln {geometry} b) to identify islands some kind of cluster analysis Hope that helps a little. KJ "Louise Mair" wrote in message news:camkzt57pep1zkpgm

Re: [R] Creating polygons from scattered points

2012-03-14 Thread R. Michael Weylandt
This might be a question for the R-SIG-Geo or R-SIG-Ecology lists. Best, Michael On Wed, Mar 14, 2012 at 7:13 AM, Louise Mair wrote: > Hello, > > I have a distribution dataset for species consisting of xy coordinates at > the 1km resolution, with only presence data. So a simplified example of a

[R] Creating polygons from scattered points

2012-03-14 Thread Louise Mair
Hello, I have a distribution dataset for species consisting of xy coordinates at the 1km resolution, with only presence data. So a simplified example of a species distribution might be: y <- rbind(as.integer(rnorm(100,50,20)), as.integer(rnorm(200,100,30)), as.integer(rnorm(100,180,15))) x <- rbi