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

[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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