[TowerTalk] Trees, Mountains, 15 degrees...

[Pete Smith]

I think the number of points Mike cites is correct, and that the 3 mile 
figure is assuming 100 feet per interval, or about 30M, which is the 
horizontal resolution of the USGS DEM data.  It seems reasonable that if 
you had Mount Everest 20 miles away it would have an effect, and I expect 
that's true for lesser mountains too.

73, Pete N4ZR

At 08:36 PM 1/24/2005, Michael Tope wrote:

> > However, Jim did say "a few miles" away.  HFTA, N6BV's terrain analysis
> > software for the ARRL, only includes terrain out to about 3 miles in its
> > calculations.  The shape of the terrain obstruction can also make a
> > substantial difference in how much impact it will have.
> >
> > All that being said, 15 degrees... wow.
> >
> > 73, Pete N4ZR
>
>Pete are you sure that is correct? I thought HFTA would do 149 terrain
>points at whatever spacing provided, the tradeoff being fine structure
>detail versus distance covered.
>
>Mike, W4EF........................