[GRASS-user] Thiessen Polygons

[MORREALE Jean Roc]

Moritz Lennert a écrit :
> On 12/02/09 04:15, Dylan Beaudette wrote:
>> On Wed, Feb 11, 2009 at 5:03 PM, Dylan Beaudette
>> <debeaudette at ucdavis.edu> wrote:
>>> On Wednesday 11 February 2009, MORREALE Jean Roc wrote:
>>>> Hamish a écrit :
>>>>> Kurt Springs wrote:
>>>>>> Does anyone know how to do Thiessen Polygons in GRASS?
>>>>>>
>>>>>> I need to use them around various types of megalithic tomb
>>>>>> sites that are in point vector files.
>>>>> v.voronoi
>>>>>
>>>>>
>>>>> there is some replacement test code to look at in grass-addons as 
>>>>> well:
>>>>>  http://trac.osgeo.org/grass/browser/grass-addons/vector/voronoi
>>>> While we are on this topic, is there a way to get a weigthed voronoi
>>>> diagram using grass ?
>>>>
>>>> The ability to rank a point to tune the area's influence would be 
>>>> great,
>>>> for that purpose I've been using an arcgis'extension* but with grass it
>>>> is not possible**. Is there a way to get a similar result ?
>>>>
>>>> *http://www.geog.unt.edu/~pdong/software.htm
>>>> **http://osdir.com/ml/gis.grass.user/2004-04/msg00036.html
>>>>
>>>> Regards,
>>>> MORREALE Jean Roc
>>
>> Now that I have read about 'weighted voronoi diagrams', 
> 
> One version of such diagrams are Reilly surfaces [1],[2] used in retail 
> geography to identify the influence/attraction zone of a city, often 
> depending on population size.

I didn't knew about it, I'll try look for the reference you gave thank. 
My aim is quite similar to your example as it consists in balancing the 
influence zone of a archeological settlement, not by the estimated 
population, but by a factor resulting from the amount of data collected 
(historical&material).

Regards,
MORREALE Jean Roc