[GRASS-user] [GRASSLIST:1146] spatially group point

[Luca Casagrande]

Hi Pierluigi!
Don't know if my approach would be good, but I'd follow this way..

1) Add a new column called "group" in the 300 points layer;
2) Create a vector layer extracting  only 1 point and assign the number of 
group you want;
3) With v.distance, found the distance between each points of the original 
layer (with some threshold you could speed up the process..) and this point, 
and upload it to the attribute table.
4) Select only the 3 elements with low value of distance, extract them, add a  
and v.patch with the point in section 2.
5) Repeat extracting the second point..
6) Merge all the layer from section 4.

Let me know if it works...

Bye
Luca

Alle 15:51, lunedì 03 luglio 2006, Pierluigi De Rosa ha scritto:
> Dear Users,
>
> I'm working with vector with about 300 point.
> I would want to group and classify spatially the points in groups of 4 so
> as to characterize for every group the 4 more neighbors between they. For
> example in my case, I wont  75 (300/4) group of points more close spatially
> between them.


-- 
"L'ambizione è l'ultimo rifugio del fallito (Oscar Wilde)"

GENTOO-GIS Development Team
jabber: casagrande at jabber.linux.it