[GRASS-user] Difference in sunset/sunrise time between r.sun and r.sunmask

[Stephen Sefick]

Oh sorry, good luck.

On Mon 02 Jan 2012 10:46:44 AM EST, Büro Seling wrote:
> Am 02.01.2012 16:19, schrieb Stephen Sefick:
>> If you use R there is a sunrise.set function in the StreamMetabolism 
>> package (shameless promotion). That may be helpful.
>>
>> Stephen Sefick
>>
>> On 01/02/2012 06:57 AM, Büro Seling wrote:
>>> Dear Group!
>>>
>>> Happy New Year @all!
>>>
>>> I work on a Linux GRASS 6.4.2 RC1. The area of interest is in 
>>> central Europe and
>>> the projection is WGS84(EPSG:4326).
>>>
>>>
>>> When I use the r.sun module and let it show the sunset/sunrise time 
>>> and compare
>>> it with the sunset/sunrise from a map created with r.sunmask I see 
>>> great
>>> differences (up to 50 minutes).
>>>
>>>
>>> It is not the timezone (which is set correctly) in r.sunmask.
>>>
>>> The results from r.sunmask seem to be, according to other sources, 
>>> seem to be
>>> right, but the results from r.sun are fare off.
>>>
>>> Please give a suggestions or help!
>>>
>>> Stefan
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>>
> Thanks for Your suggestion Stephen,
> but I have to make "shadow" maps with r.sun and my problem is how to 
> get r.sun work within the correct sunrise/sunset timespan.
>
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