I need the most suitable areas (with SE aspect) to have the value of 255 and the unsuitable (North aspect) to have the value of 0. Grass returns N=90 and SE=315 and flat=0. So the minimum value of aspect raster is flat areas and the max is areas with 359 degrees of east. I should set North as the minimum value and SE as the max value (most suitable areas). I should rescale the raster because I need to include it in an AHP method. All rasters will be rescaled in a common 0-255 scale.
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