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Re: [TowerTalk] Delorme data bases

To: Byron Lichtenwalner <>
Subject: Re: [TowerTalk] Delorme data bases
From: David Gilbert <>
Date: Tue, 11 Sep 2007 17:12:04 -0700
List-post: <>
HFTA uses a very simple text format for the terrain files.  It's simply 
two spaced columns of numbers like this:

0  h0
d1  h1
d2  h2
d3  h3
etc, where d# is distance from the antenna and h# is the elevation.  You 
can choose (via the setup dialog box in HFTA) to use either feet or meters.

You can literally create a text file (even an arbitrary one if you want 
to see the effects of different profiles) from scratch in any text 
editor with the data in columns as shown above.  After you save it as a 
text file, rename it with a .PRO extension (i.e., filename.PRO).  Put 
that file in the same directory as HFTA and you are set to go.

So ... getting to your original question, I have several times used 
Delorme 3-D TopoQuads for Arizona to generate a terrain profile, 
manually pulled the distance and elevation figures off the plot, and set 
up a text file.  It's a bit tedious but it works fine, and I'm sure you 
could do the same with TopoUSA since it will plot a terrain profile for 
you as well.

Dave   AB7E

Byron Lichtenwalner wrote:
> Friends
> I would like to use MicroDEM/HFTA to do some analysis of my site.
> Have any of you used Delorme Topo USA to do this, and if so with what 
> success??
> Byron, W3WKR 
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