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 -- Best regards, Dr. Margherita DI LEO Scientific / technical project officer European Commission - DG JRC Institute for Environment and Sustainability (IES) Via Fermi, 2749 I-21027 Ispra (VA) - Italy - TP 261 Tel. +39 0332 78 3600 margherita.di-...@jrc.ec.europa.eu Disclaimer: The views expressed are purely those of the writer and may not in any circumstance be regarded as stating an official position of the European Commission.
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