Bob Moskovitz wrote:
> I was just wondering why aspect is measured from the east
> and increased counterclockwise instead of the north and
> clockwise? It seems to run counter to what is done in other
> GISs.
It is just measuring theta positive from the x-axis, in the mathematical
sense.
It stays like that for historical reasons, probably been that way for 20+
years. (aka we can only guess at the original logic)
Convert between that and the compass (CW from north) convention with
"90 - angle". Most modules which deal with aspect maps should already
have an option to read the different type.
Hamish
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