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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