[GRASS-user] Thiessen Polygons

[Lyle E. Browning]

The messages from Kurt Spring and Jean Roc Morreale point to  
archaeological work using GRASS. How many other archaeologists are  
there on the list using GRASS. I'd be interested in hearing about  
archaeological applications as I have just begun the learning curve  
for my own archaeological work.

Thanks,

Lyle Browning


On Feb 12, 2009, at 5:49 PM, MORREALE Jean Roc wrote:

> 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
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