[GRASS-user] Calculate statistics for raster values in polygons

[Micha Silver]

Luis Lisboa wrote:
> Hi all
> I'm reading the v.rast.stats Help and I'm a bit confused. It says 
> "Calculates basic univariate statistics from a raster map only for the 
> parts covered by the specified vector map". But for instance if all my 
> region is covered by different polygons and, if I want to calculate 
> for each polygon my average value from raster, is this function 
> helpful? (e.g. I have vector with
yes, exactly the function you need. It adds nine attribute columns to 
your vector layer with min,max,mean, etc values calculated from the raster.
> zip codes for my region and I want to calculate average elevation of 
> each zip code).
>
> On Wed, Apr 21, 2010 at 6:21 PM, Jarek Jasiewicz <jarekj at amu.edu.pl 
> <mailto:jarekj at amu.edu.pl>> wrote:
>
>     Luis Lisboa pisze:
>
>         Greetings
>
>         I have a vectorial data that divides my region in sub-areas. I
>         want to calculate the average value of  a raster but instead
>         for all pixel values, I want to calculate the average of pixel
>         values that are inside each polygonIs this possible in GRASS?
>         If yes, how?
>         Thank you
>         Luis
>         ------------------------------------------------------------------------
>
>
>
>         _______________________________________________
>         grass-user mailing list
>         grass-user at lists.osgeo.org <mailto:grass-user at lists.osgeo.org>
>         http://lists.osgeo.org/mailman/listinfo/grass-user
>          
>
>     v.rast.stats
>
>
>
> This mail was received via Mail-SeCure System.
> ------------------------------------------------------------------------
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
> This mail was received via Mail-SeCure System.
>
>
>   


-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://surfaces.co.il