On 2015-07-09 00:51, Glynn Clements wrote:
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"
Even better, thanks !
Added as a FAQ [1] and to the r.slope.aspect manual (r65553).
Moritz
[1] http://grasswiki.osgeo.org/wiki/Transform_CCW_aspect_to_azimuth
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