[GRASS-user] aspect map with azimuth values

[Glynn Clements]

Moritz Lennert wrote:

> > how can I convert aspect map's values to azimuth values?
> > or is there any way to create aspect map with azimuth values?
> 
> I think this should work (but you should double check):
> 
> if aspect <= 90, then azimuth = 90 - aspect
> else: azimuth = 450 - aspect
> 
> i.e.
> 
> r.mapcalc "azimuth_aspect = if(aspect <= 90, (90 - aspect), (450 - 
> aspect))"

Or:

	r.mapcalc "azimuth_aspect = (450 - aspect) % 360"

-- 
Glynn Clements <glynn at gclements.plus.com>