zonal statistics, was: Re: [Qgis-user] Anything faster than v.rast.stats

[Giovanni Manghi]

On Tue, 2011-06-21 at 14:55 +0100, Frederico Mestre wrote:
> Hello,
> 
> 
> I'm trying to retrieve some statistics from several rasters, based on
> overlaying vectors.


I gave a try to the new "zonal statistics" tool available in qgis-trunk.
After choosing the raster and vector map and the prefix for new table
columns, when pressing "ok" it seems to do nothing.

Actually if the vector is added again to the project the 3 new columns
are there (sum,avg,count), but are filled with NULLs.

Anyone else is getting the same?


cheers

-- Giovanni --