[Qgis-user] R.sun and the irradiation calc

[Neumann, Andreas]

Hi Pedro, 

I suggest you ask this on the GRASS mailing list. 

Andreas 

On 2017-05-05 13:15, Pedro Alcoba Gómez wrote:

> Hello everyone, 
> 
> I have a question about the calculation of irradiation for a study area in QGIS. 
> 
> This calculation was performed using the GRASS r.sun model integrated in QGIS. 
> 
> As input data I use an MDE, and a layer of slopes (in degrees) and orientations calculated from the MDE. 
> 
> After performing in analysis, and comparing the irradiation data for the month of January and August, I get higher levels for January. 
> 
> The study area is located in the southwest of Spain EPSG: 25830 ETRS1989 30N 
> 
> In my opinion the result is unreal, since the highest irradiation rates obtained in the northern hemisphere correspond to the summer months. Does anyone have any idea that it may be going wrong? 
> 
> A greeting and thanks in advance 
> 
> --
> Atte. Pedro Alcoba Gómez 
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