I have a vector layer with the determined polygons and a raster layer that is a cutout of a DEM with calculated aspects. I have tried to use "zonal statistics" in QGIS, but then it only calculates one mean aspect for each polygon and most of the polygons then get a mean southern slope.
The reason I want to have the proportion is to evaluate how much of the area in a polygon is suitable for an alpine species according to northern slopes being preferably unsuitable with longer snow coverage etc.
Hey Oscar!
Maybe the solution is to recclasify the slopes (I mean to change real values of slope raster to the new values, i.e. north = 1, and south, east, west = 0). Next - just calculate polygon areas and north slopes areas. You van try it!
All the best!
Bartek
Instead of trying to accomplish the task in a single raster operation, think in terms of a sequence of raster operations using the various zonal statistics.
Hello Mr. Østvold, I would suggest to use r.report in QGIS, before that use vector layer mask on raster layer (r.mask.vect or r.mask.rast).
I hope that helps.
Ulrich Ondřej
PS: in the attached file is the example of the output file of the r.report algorithm with classes of land-use in analysed basin.
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