[GRASS-user] Unable to get an horizon from a DEM using r.horizon

Hamish hamish_b at yahoo.com
Thu Aug 27 21:57:30 EDT 2009


Mathieu Monney wrote:
> My goal is to extract the visible horizon given a point
> using a DEM I have successfully imported into GRASS. Using
> the r.horizon command it returns me some good result for
> some part of the horizon. However at some other angle in
> returns me the 0 value which means that no horizon has been
> found. I cannot understand why we cannot found a horizon.
> There always be an horizon, even if a point lies on lower
> altitude than you. I have tried to modify the r.horizon
> command to return horizon values which are also below you
> but it doesn't work well and returns me some weird results.
> 
> Anyone having some clues about that?


not directly, but you might try the r.los module, or r.viewshed from
wiki addons.


Hamish



      



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