(This article was first published on dylan's blog, and kindly contributed to R-bloggers)
Just read about a new R package called alphahull (paper) that sounds like it might be a good candidate for addressing this request regarding concave hulls. Below are some notes on computing alpha-shapes and alpha-hulls from spatial data and converting the results returned by ashape() and ahull() into SP-class objects. Note that the functions are attached at the bottom of the page. Be sure to read the license for the alphahull package if you plan to use it in your work.
Alpha-Shape Example
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
