angle of view measurement

Malcolm Williamson malcolm at cast.uark.edu
Mon Sep 19 18:08:27 EDT 1994


> 
> I am trying to calculate the viewing angle from each pixel in a map layer.
> I thought I could do this using r.los, but now that I read through the
> manual page properly I see that this doesn't sem to be possible. I
> understand thst r.los gives the vertical angle needed to view each pixel,
> instead of what I want, which is an measurement describing the angle of the
> surrounding terrain visible from a particular point.
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Paddy,
I'm not sure I understand exactly what angle you are looking for. Could you
give me a more detailed description of your desired answer? You can e-mail me
directly if you like,

> 
> Does anyone know how I could do this, or this there a tool availble to do
> this.
> Surely someone must have come across this problem before.
> 
> Thanks in advance
> 
> Paddy
> 
Regards,
-- 
Malcolm D. Williamson - GIS Specialist           E-mail: malcolm at cast.uark.edu
Center for Advanced Spatial Technologies      Telephone: (501) 575-6159
Ozark Rm. 12                                        Fax: (501) 575-3846 
University of Arkansas              
Fayetteville, AR 72701



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