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

To: "Michael Tope" <>,"Pat Barthelow" <>, <>,<>, "Pete Smith" <>
Subject: Re: [TowerTalk] Trees, Mountains, 15 degrees...
From: "Jim Lux" <>
Date: Mon, 24 Jan 2005 21:11:33 -0800
List-post: <>
The documentation says it handles uneven spacing. It assumes flat plates,
and does a Geometric Theory of Diffraction calculation, so it should work.
There's probably an optimum spacing of points at areas of high rate of
change of slope.  Perhaps an email to Dean Straw might be in order?

> ----- Original Message -----
> From: "Jim Lux" <>
> > I believe it is the latter...
> > In fact, the bottom of page 24 and the top of page 25 of hfta.pdf
> > 1.0) describes manually editing a .pro file to add a big mountain a long
> > way away.
> >
> Jim, et al:
> I wonder if HFTA would have any problems with unevenly
> spaced points. If you have a mountain that is 15 miles away
> with a flat plain in between, you really want to conserve those
> 149 points so you have adequate resolution for the fine
> structure of the mountain (as opposed to a evenly spaced
> points which would mostly be wasted in the flat area
> between the tower and the mountain). The desert areas
> north of here are very typical of that situation. You have a
> flat mesa for many miles, then a very high mountain range
> (7 to 8K feet in some cases) which sets the angle of the
> visual horizon and surely has an influence of the
> take-of-angle.


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