Message-ID: <20110211144015.GT455@greode>
Date: 2011-02-11T14:40:16Z
From: Georg Ruß
Subject: help tp select points of border with spatstat
In-Reply-To: <AANLkTi=iKPT-puVQ10iGi6g9Ac14nchzVLyY_-Wz3qiT@mail.gmail.com>
On 10/02/11 21:56:02, gianni lavaredo wrote:
> I have a points shapefile with wave shape. I wish to select only the border
> points to create a border owin with the same wave shape. I tryed to use
> convex.hull but the final shape is not the same. Some researchers have some
> suggestions?
I once had a similar issue when I wanted to create a hull (i.e. select
only the border points) for a non-convex set of points, so-to-say. I ended
up doing some approximation and also came across the alphahull package.
Maybe "ahull" in that package with a suitable "alpha" parameter can help.
Georg.
--
Research Assistant
Otto-von-Guericke-Universit?t Magdeburg
research at georgruss.de
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