I have been recently exposed to an aspect map that looked like this:
I wonder why North-y orientations (N, NE, NW) are shown in red and orange while South-y orientations (S, SE, SW) are shown in light and dark blue?
According to the color theory, blue is a cold color and red is a warm color. If I understand things right, in the Northern hemisphere, areas with the North aspect are exposed to the sun less that the ones with the South aspect. This makes me think of areas with South aspect as of "warmer" areas and ones with North orientation as of "colder" areas, so I would reverse the color schema used.
Is there any particular reason why these colors are used as a standard for aspect maps? I have browsed through many aspect maps online (link1, link2, link3) and all of them use the same color ramp I referred above.