[GRASS-user] aspect map with azimuth values

[Ahmet Temiz]

thank you all

On Thursday, July 9, 2015, Moritz Lennert <mlennert at club.worldonline.be>
wrote:

> 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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-- 
Ahmet Temiz
Jeoloji Müh.
Afet ve Acil Durum Yönetimi Başkanlığı
Bilgi İşlem  Dairesi Başkanlığı-CBS Grubu


________________________

Ahmet Temiz
Geological Eng.
Information Systems - GIS Group
Disaster and Emergency Management
of Presidency
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