Re: (TFT) Line of Sight

[<dwtulloh61@cox.net>]

---- ErolB1@aol.com wrote: 
> Does anyone on the list have any good real-world data/cites for 
> average/median/maximum "line of sight" distances in different 
> terrain types?



---- ErolB1@aol.com wrote: 
> Does anyone on the list have any good real-world data/cites for 
> average/median/maximum "line of sight" distances in different 
> terrain types?

ay-yi-yi ... you'd have to be sure to factor in the prevailing vegetation
height and the height of your sensor as well.  And just because you
have line-of-sight doesn't mean that you'd be able to discern things
at that distance.  And if you're talking about discerning, the size of
the object you're looking at (as well as its apparent contrast) is an
issue as well.

I'm sure there are some studies which will can provide some hard numbers to your question but I'm not sure I can provide them to 
you in this forum.

But lets see if we can tackle this in another way:
Let's say that the unaided eye of a human can discern a human size
object at a distance of 5K on a flat plain.  Then you can start dividing
this distance by the roughness of the terrain that you are in: plains
might have a roughness factor of 1.1 ... rolling hills, 1.3 on up to 
rugged mountains at 10.0.  Throw in vegetation on top of that and 
I think you might have a decent first cut at a general LOS model.

Dan
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