In GRASS you could do: - Convert vector file to raster (*v.to.rast.attr*), using the land use class as raster category - Use* r.stats* or* r.report *to calculate coverage of each land use class. The r.report functions offer more output options, the r.stats output is easier to use in e.g., a spreadsheet.
These GRASS GIS commands are also available in the GRASS toolbox or the Sexante Toolbox in QGIS. To find the functions mentioned above, both toolboxes have a filter / search box making it easy to find any command / function. Note that to the GRASS toolbox you will need the extra step of importing your data in a GRASS GIS database. If you don't have your data in a GRASS GIS database, you probably want to try the Sextante toolbox. On Sun, Dec 2, 2012 at 11:43 AM, Dietrich Heintz <[email protected]> wrote: > Hi all, > I have a raster with landuse classification from Modis and would like > to aggregate the hectarage of each class within administrative boundaries. > > Is there a tool in QGIS or Grass that aggregates the percentual coverage > of each (landuse) class within each feature of the shape directly from > the raster? > > At the moment I polygonize and intersect, but it turned out to be very > time consuming, > due to the processing. > > If someone has a useful idea or solution I would be very much pleased. > > Dieter > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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