[GRASS-dev] integrate v.concave.hull into v.hull [was point cloud analysis: new features]]

Markus Metz markus.metz.giswork at gmail.com
Sun Jan 11 12:03:04 PST 2015

On Fri, Jan 9, 2015 at 9:35 AM, Moritz Lennert
<mlennert at club.worldonline.be> wrote:
> On 08/01/15 23:46, Markus Metz wrote:
>> On Mon, Jan 5, 2015 at 12:17 PM, Benjamin Ducke <benducke at fastmail.fm>
>> 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.

Markus M

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