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

[Marco Hugentobler]

> 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?

Just tested and the zonal statistics seems to work here. However, I think it 
only works with single band rasters. Please fill a ticket and attach test data.

Regards,
Marco

Am Dienstag, 21. Juni 2011, 16.50:03 schrieb 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 --
> 
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-- 
Dr. Marco Hugentobler
Sourcepole - Linux & Open Source Solutions
Churerstr. 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee