[GRASS-dev] Re: Line of Sight Update

[Laura Toma]

On Jul 9, 2008, at 12:40 PM, Paul Kelly wrote:

>>> Regarding the output:   my suggestion was to output, for every  
>>> cell that is
>>> visible, its  height  (or slope) *above* the line of sight;  this  
>>> will give
>>> an indication of how visible the point is.  Similarly, for the  
>>> cells that
>>> are *not* visible,  you could compute their height (or slope)  
>>> below the line
>>> of sight.  High positive values will mean the point is very  
>>> visible;  high
>>> negative values will mean the point is very un-visible.
>
> I don't quite understand what "the line of sight" is here. What I  
> think of as the line of sight is a straight line from the observer  
> to the visible cell, passing straight through both. Some kind of  
> output relating to how visible the cell is definitely sounds like a  
> very good idea though.
>

Sorry, I meant the height/slope  above or below  the horizon.   In  
other words,  at   a point p,  in addition to boolean visibility,  we  
can compute
the height difference between p and the lowest point at that location  
that would be visible by the observer.


-Laura 
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