[GRASS-user] Using r.sun to get shadowed areas

[Anna Petrášová]

Yes, you are right, I fixed it, thank you.

Anna

On Wed, Nov 22, 2017 at 7:27 AM, Micha Silver <tsvibar at gmail.com> wrote:
> I'm using r.sun to extract shadowed areas from a LIDAR derived DTM for some
> date/hour combinations. (GRASS 7.2) According to the man page:
> "A map of shadows can be extracted from the solar incidence angle map
> (incidout). Areas with zero values are shadowed."
>
> In my output incidout raster, there are never values of zero. The minimum
> incident angles are quite small, but no zeroes. However the NULL pixels seem
> to be exactly the shadowed areas. (I am comparing with ortho-photos taken at
> those specific dates and hours). Am I mistaken, or should the documentation
> be changed to "Areas with NULL values are shadowed".
>
> Thanks
>
> --
> Micha Silver
> Ben Gurion Univ.
> Sde Boker, Remote Sensing Lab
> cell: +972-523-665918
>
>
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