Hi,
Postgis SVN (2.0) has a function called ST_ConcaveHull
(http://www.postgis.org/documentation/manual-svn/ST_ConcaveHull.html) -
it says it builds upon GEOS - (but probably only in geos-svn) - so there
should be some way to expose it in a future QGIS version.
See also this thread:
http://www.mail-archive.com/[email protected]/msg10785.html
and Regina's examples:
http://www.bostongis.com/postgis_concavehull.snippet
I currently can't find the GEOS class/method that calculates it, but
since Postgis makes a reference to GEOS it has to be somewhere in GEOS.
If you want to speed up the process, you can perhaps pay a developer to
include it.
Andreas
On Tue, 3 Jan 2012 11:36:28 +0800, maning sambale wrote:
We have a nifty convex hull in ftools/vector plugin. I'm looking for
ways to create concave hulls. I have a set of csv points as a source
to generate the polygon. This is updated regularly by non-geo field
workers. Any workaround to generate concave hull in QGIS?
Mappy new year to all!
PS. I've seen old discussions in the qgis-dev list.
--
--
Andreas Neumann
Böschacherstrasse 10A
8624 Grüt (Gossau ZH)
Switzerland
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