[GRASS-user] r.horizon and negative tilt

[Markus Metz]

On Sat, Jul 28, 2018 at 3:59 PM, Frank David <frank.david at geophom.fr> wrote:
>
> Dear all,
>
> It seems that r.horizon in does not return negative heights. How it's
possible in case of the given point from the calculation is done is located
on mountain and the horizon around is below zero ??. I miss something may
be...

r.horizon is indeed ignoring points that are lower than the given point, see
https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.horizon/main.c#L1037
and following lines

I agree that this behaviour is questionable

Markus M

>
> Thank you for your explanations
>
> Regards
>
> Frank
>
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