On Sun, Jan 11, 2015 at 9:03 PM, Markus Metz <[email protected]> wrote: > On Fri, Jan 9, 2015 at 9:35 AM, Moritz Lennert wrote: >> On 08/01/15 23:46, Markus Metz wrote: >>> >>> On Mon, Jan 5, 2015 at 12:17 PM, Benjamin Ducke 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 ;-) >> >> All these great addons ! >> >> For this particular one: would it be interesting / possible to integrate it >> directly into v.hull ? > > No, because v.hull is a C module and v.concave.hull a script which > does not use v.hull at all. Instead, v.concave.hull cleans the output > of v.delaunay to create concave hulls.
I have a similar problem: imagine a set of contour lines which describe the bathymetry of a lake, so essentially contour lines which are closing a polygon but consist of different lines. I would like to get the respective polygon representation, i.e. the outer lines only and those turned into a polygon. I just tried v.concave.hull on it, however, it expects points and not lines. Does anyone have an idea how to achieve that? thanks markusN _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
