r.los

[Bill Brown]

>> Does anybody have ideas about the following : we all know
>> that r.los can show you the area that is visible from a certain
>> observation point, but can it also show you from what area you can observe
>> something (I am told that this is not necessarily the same)?

>> Philip Verhagen

----
> I do not quite understand your first question. As to the scenic drive,
...
> Jianping Xu     jianp at ocean.rutgers.edu

Jianping,

I think he's talking about the "one-way visibility" phenomenon that occurs
due to geometric interpretation of cells and the algorithms used to determine
los, as you demonstrated in your paper this year at the GRASS conference.
Have you contributed your los program using different alogrithms yet?  Also,
have you been able to define under what conditions (resolution vs. height)
the one-way visibility is more pronounced?

Bill