I have extracted Aspect values in degree from DEM in ArcMap 10.2 full license. I want to investigate effect of Westness in my model so I was using conversion formula of Folded Aspect : ABS (180- ABS(Aspect-270)) But it seems like this works when we deal with radiation and sunlight. There is another formula to calculate southwestness of aspect yet it gives degree between 0-200 with ((cos(aspect-255)+1) * 100). (( And why 255?Shouldn't be 225?))
Do you have any idea of the formula for converting to "Westness" from 0-180?
My model is not water-related so that formula having catchment area is also not useful for me.