On 08/01/15 23:46, Markus Metz wrote: [..]
>> Thanks Markus, this is excellent progress. >> It seems to me that the approximation of cluster shapes from grouped >> points is a generic problem that would best be solved with a separate >> module. As long as the shapes are roughly convex, the existing v.hull >> should work fine. For concave shapes, AFAIK things become messy because >> common methods such as alpha shapes require the user to provide >> threshold values. > > This is true, but v.concave.hull [0] could help ;-) > > Markus M > > [0] > https://trac.osgeo.org/grass/browser/grass-addons/grass7/vector/v.concave.hull > Wow. And it's been there for a while. How could I not see that? I think it's high time that I switch from GRASS 6 to 7. Nevertheless, since you did all that work on v.cluster in GRASS 6, maybe it would be worth implementing this: http://grasswiki.osgeo.org/wiki/Create_concave_hull ... in a GRASS 6 shell script? I am looking forward to trying the new clustering algorithms, especially "density" and "optics2" Many thanks, Ben -- Dr. Benjamin Ducke {*} Geospatial Consultant {*} GIS Developer Spatial technology for the masses, not the classes: experience free and open source GIS at http://gvsigce.org _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
