[GRASS-user] percentage of class in raster within polygons

[S. Koukoulas (listes)]

how about,
v.rast.stats with number/sum option and then field calculations?
regards,
sotiris

On 02/11/2015 01:15 PM, Margherita Di Leo wrote:
> Hi,
> 
> I have to calculate the percentage of given class of a raster within the
> polygons given in a vector (a regular grid). Since I'm dealing with large
> files and operations repeated in a chain, i should be focusing on what is
> the optimal (fastest) option to do that. I could vectorize the raster and
> use v.overlay and v.to.db, or using v.rast.stats i can count out the number
> of cells (should i use number for that or sum?) and then divide per  area
> of the grid. Any better idea?
> 
> Thank you in advance
> 
> 
> 
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