[Qgis-user] basic raster processing

[Carson Farmer]

John,
> I'm relatively new to QGIS.  I've used it for viewing various sources 
> of data and some vector editing and geoprocessing.  Now, I'd like to 
> do some basic raster processing, like simply multiplying and adding 
> rasters, conditional expressions (e.g., if value < 0, then = 0, else 
> value), slope, aspect, etc....
>
>
> What is the method to do these via QGIS?   GRASS may be an option but 
> I understand it takes some preprocessing to get your files into GRASS 
> datasets, which could be a lot of work (numerous data sets, some 
> several GBs in size.)    Thanks.

Have a look at Barry Rowlingson's rasterlang plugin:
http://www.maths.lancs.ac.uk/~rowlings/Qgis/Plugins/plugins.xml

Barry also has a google code page which would likely have his latest 
version/improvements:
http://code.google.com/p/bsrplugins/source/browse/#svn/trunk

Carson

-- 
Carson J. Q. Farmer
ISSP Doctoral Fellow
National Centre for Geocomputation (NCG),
Email: Carson.Farmer at gmail.com
Web:   http://www.carsonfarmer.com/
       http://www.ftools.ca/