[GRASS-user] r.horizon and negative tilt

[Frank David]

Hi Andrea,
Thanks for your message. But what is the ground plane ? r.horizon use
the topography, so nothing is plane (and the earth curvature tends to
lower the ground). I guess as the calculation is done at ground level,
the minimum viewable horizon cannot be lower than zero. The calculation
should be done higher than ground level to "see" negatives horizon.
Never mind I will try to create my own r.horizon with r.transect or
r.profile.
Best regards,
Frank

Le 30/07/2018 à 08:47, balotti.and at gmail.com a écrit :
> Hi Frank,
> just my opinion but r.horizon I suppose is targeted to solar radiation
> modules and because of that returns only the line-of-sight "obstacles"
> above the ground plane, where direct sunlight may be obstructed by
> obstacles.
> best regards,
>
> Andrea Balotti
>
> Il 28/07/2018 15:59, Frank David ha scritto:
>> 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...
>>
>> Thank you for your explanations
>>
>> Regards
>>
>> Frank
>>
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