[GRASS-user] points in polygon query
dylan.beaudette at gmail.com
Fri May 18 13:44:36 EDT 2007
This sounds like a form of quadrat counting
some ideas might be found the the approach used in R, try searching google
quadrat count r-help
On Friday 18 May 2007 08:48, Markus Neteler wrote:
> someone asked me today a similar question as expressed by Maximiliano,
> still no idea how to calculate this in an elegant way.
> Any suggestions how to count the number of points falling into polygons
> of another map?
> Massimiliano Cannata wrote:
> > Hi all,
> > I have a task to accomlpish but I don't know how to perform it...
> > Maybe someone can give me some hinits.... :-)
> > I have a points layer and a polygon layer.
> > I want to generate a map with the geometry of the polygons and an
> > attribute that is the count of the points that fall inside.
> > Example:
> > polygons: Municipalities
> > points: car accidents
> > resulting map: Municipalities represented for number of car accidents
> > Thanks you all,
> > Maxi
> > --
> > Dr. Eng. Massimiliano Cannata
> > Scuola Universitaria Professionale della Svizzera Italiana
> > Istituto Scienze della Terra
> > Via Trevano, c.p. 72
> > CH-6952 Canobbio-Lugano
> > Tel: +41 (0)58 666 62 14
> > Fax +41 (0)58 666 62 09
Soils and Biogeochemistry Graduate Group
University of California at Davis
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