[GRASS-user] Re: How to rescale an aspect map

[Moritz Lennert]

On 13/02/12 11:16, leonidas wrote:
> Moritz,
> how did you choose 170?

315 = 255
90 = 0

Between the two you have 135 degrees (45 from 315 to 360 plus 90 from 1 
to 90). 45 / 135 = 1/3, so 360 is at 255 - 255/3 = 170.

Obviously this means that you go from 255 to 0 much quicker when you 
move counter-clockwise than when you move clockwise. Up to you to decide 
whether this is what you want.

Moritz