[GRASS-dev] point cloud analysis: new features

[Markus Metz]

On Mon, Jan 5, 2015 at 12:17 PM, Benjamin Ducke <benducke at fastmail.fm> wrote:
>>
>> On Sun, Jan 4, 2015 at 9:02 PM, Markus Metz
>> <markus.metz.giswork at gmail.com <mailto:markus.metz.giswork at gmail.com>>
>> wrote:
>>
>>
>>     Done in trunk r63952 as v.cluster. It is not a GRASS7 addon because it
>>     does not work with G7.0. At the moment it only identifies and labels
>>     clusters. Connectivity graphs and cluster shapes are not implemented.
>>     In future, I would like to add OPTICS because OPTICS can better handle
>>     different clusters with different densities.
>>
>
> 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