[GRASS-user] add a centroid in the center of polygon

[Milton Ribeiro]

Hi Moritz

I agree that a flag would be a good way ..
Best wishes

miltinho

2014-01-27, Moritz Lennert <mlennert at club.worldonline.be>:
> On 25/01/14 12:52, Markus Metz wrote:
>> On Sat, Jan 25, 2014 at 12:27 PM, Markus Neteler <neteler at osgeo.org>
>> wrote:
>>> On Sat, Jan 25, 2014 at 12:08 PM, Markus Metz
>>> <markus.metz.giswork at gmail.com> wrote:
>>>> On Sat, Jan 25, 2014 at 12:10 AM, Milton Ribeiro
>>>> <miltinho.astronauta at gmail.com> wrote:
>>>>> Dear all,
>>>>>
>>>>> I have a polygon vector, and need to add point in the center of mass of
>>>>> each
>>>>> one.
>>>>> I used v.centroid, but it adds just a centroid, but not in the central
>>>>> position of the polygon area.
>>>>
>>>> v.centerpoint from addons [0] does that.
>>>>
>>>> Markus M
>>>>
>>>> [0] http://grasswiki.osgeo.org/wiki/AddOns/GRASS7/vector#v.centerpoint
>>>
>>> Right, I forgot about this nice addon!
>>> Perhaps its functionality might be merged into v.centroids [1]?
>>
>> No, because the center of mass is not always within the area.
>
> But couldn't that be a documented flag (e.g. something like this:
> 'always place centroid within the area (for GRASS polygon)').
>
> Personally, I support MarkusN's idea of merging the two, if that's
> possible from the code point of view. I find it more intuitive to look
> for a module creating centroids...
>
> Moritz
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