Il 30/07/2018 09:24, Frank David ha scritto:
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).
Yes, what you explain below is what I mean with "ground plane".
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.
Have you taken a look to r.viewshed? I never tried it but maybe is
useful for your purposes.
Never mind I will try to create my own r.horizon with r.transect or
r.profile.
Best regards,
Frank
Best regards,
Andrea
Le 30/07/2018 à 08:47, balotti....@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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