[R-sig-Geo] External "Envelope" of a set of points in space - not convex hull

[Michael Sumner]

Try the alphahull package, which is on CRAN.

I don't believe it will smooth the result for you, but you could take
it from there and use other R functions to do that.

Cheers, Mike.


On Fri, Jun 22, 2012 at 4:56 PM, PCB <pedrocontebarros at gmail.com> wrote:
> Dear All,
>
> I have a set of observations on an area, and I would like to define the
> "investigated area" as the smallest polygon (preferably smoothed with e.g.
> splines fit) that encloses all the points. This is similar to the convex
> hull problem, except that my data have "gulfs", i.e. areas that are not
> sampled (and should not be), between two "fingers" of areas investigated. I
> am sure I have seen something about solving this lately, but after a couple
> days searching could not find it (I am sure I am using the wrong
> keywords...).
>
> Any help would be appreciated
>
> --
> View this message in context: http://r-sig-geo.2731867.n2.nabble.com/External-Envelope-of-a-set-of-points-in-space-not-convex-hull-tp7580290.html
> Sent from the R-sig-geo mailing list archive at Nabble.com.
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo



-- 
Michael Sumner
Hobart, Australia
e-mail: mdsumner at gmail.com