[GRASS-dev] partitioning of vector polygon?

Moritz Lennert mlennert at club.worldonline.be
Thu Aug 16 09:28:54 PDT 2018

On 16/08/18 17:04, Markus Neteler wrote:
> On Thu, Aug 16, 2018 at 10:34 AM Moritz Lennert
> <mlennert at club.worldonline.be> wrote:
>> On 15/08/18 15:56, Anika Bettge wrote:
>>   > does anyone know how I can split a polygon into n polygons?
>>   >
>>   > For performing area image classification I need to spatially divide my
>>   > training data (points in the polygon) into spatial clumps with those I
>>   > want to train different classifiers, so that I do not need to load the
>>   > image data for the whole polygon at once in the mapset. The image area
>>   > contains 4*10^9 pixels.
>> Maybe I don't really understand what you are trying to do, but would
>> v.mkgrid be the solution for you ?
> Unfortunately not: we want to split the area of interest (vector
> polygon) into subareas.
> It looks like this:
> https://doc.cgal.org/latest/Partition_2/index.html
> but with the need of specifying the number of subareas (e.g. roughly
> of the same size).
> The polygon may have "any" shape.
> With v.mkgrid we may end up with tiny polygon chunks here and there.

You could clean those in a second step with v.clean tool=rmmarea.

Otherwise, maybe the skeleton option (-s) of v.voronoi could help ?


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