Re: [GRASS-user] r.horizon and negative tilt

On Mon, Jul 30, 2018 at 4:55 PM, Frank David wrote: > > Hello Markus, > > is it possible to add an option to evaluate the negatives hight in a future release ? (I don't know C) Please try trunk r73049. Negative angles are now allowed by default. Markus M > > Best regards, > Frank > Le

Re: [GRASS-user] r.horizon and negative tilt

Dear Mark, El vie., 3 ago. 2018 a las 19:05, Mark Lake () escribió: > Frank, > > Some years ago I wrote a module (also called r.horizon) which I > think does what you want. I never got around to formally > contributing it (must compare with the existing r.horizon and do > so some time). yes!

Re: [GRASS-user] r.horizon and negative tilt

Frank, Some years ago I wrote a module (also called r.horizon) which I think does what you want. I never got around to formally contributing it (must compare with the existing r.horizon and do so some time). Anyhow, have updated for GRASS 7 and will send you the code direct - it compiles

Re: [GRASS-user] r.horizon and negative tilt

Hello Markus, is it possible to add an option to evaluate the negatives hight in a future release ? (I don't know C) Best regards, Frank Le 30/07/2018 à 16:19, Markus Metz a écrit : > > > On Sat, Jul 28, 2018 at 3:59 PM, Frank David > wrote: > > > > Dear all, > >

Re: [GRASS-user] r.horizon and negative tilt

On Sat, Jul 28, 2018 at 3:59 PM, Frank David 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...

Re: [GRASS-user] r.horizon and negative tilt

Ho yes, why not. I  could use r.viewshed to find the farest part of the topography able to see my point and get it's angle mode. The trick to find is how to get that cell ? Best regards, frank Le 30/07/2018 à 11:18, balotti@gmail.com a écrit : > Il 30/07/2018 09:24, Frank David ha scritto: >>

Re: [GRASS-user] r.horizon and negative tilt

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

Re: [GRASS-user] r.horizon and negative tilt

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

Re: [GRASS-user] r.horizon and negative tilt

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

[GRASS-user] r.horizon and negative tilt

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