[GRASS-dev] Re: Line of Sight Update
Laura Toma
ltoma at bowdoin.edu
Wed Jul 9 14:37:23 EDT 2008
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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