[Qgis-user] Creating cross tables

Otto Dassau otto.dassau at gmx.de
Wed Nov 24 07:56:21 EST 2010


Hi,

you can use the GRASS statistic modules for that. They allow to add several
input raster maps. 

in your case have a look at:
http://grass.osgeo.org/grass64/manuals/html64_user/r.average.html

r.average - Finds the average of values in a cover map within areas assigned
the same category value in a user-specified base map. 

Regards,
 Otto

Am Wed, 24 Nov 2010 14:21:00 +0200
schrieb "Dr. F. Patrick Graz " <fgraz at unam.na>:

> Hi folks,
> I would like to create a cross table between raster maps, but can't seem to
> find a way to do this. 
> 
> I have a raster map (in GRASS) that contains a number of properties. I also
> have vegetation biomass data for x numbers of years (also in GRASS).
> 
> I would now like to calculate the average biomass for each property, for
> each year. 
> 
> So far I have not found the right command to do this job - or I have been
> using the wrong syntax.
> 
> Any suggestions are welcome.
> 
> Patrick
> 
> ------------------------------------------
> Dr. F. Patrick Graz
> Snr. Researcher, 
> Multidisciplinary Research Centre, 
> University of Namibia
> 
> 
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