#Alpha-shapes with #R and lattice | (R news & tutorials)
▻http://www.r-bloggers.com/alpha-shapes-with-r-and-lattice
A package called alphahull includes functions for computing alpha shapes and hulls in R.
Working with Spatial Data
▻http://casoilresource.lawr.ucdavis.edu/drupal/book/export/html/519
A collection of notes, examples, references, and thoughts on working with spatial data.