To: | "Michael Tope" <W4EF@dellroy.com>, "W3YY" <w3yy@cox.net>,"TowerTalk List" <towertalk@contesting.com> |
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Subject: | Re: [TowerTalk] RE: Downloading terrain data for use with HFTA |
From: | Pete Smith <n4zr@contesting.com> |
Date: | Thu, 13 Jan 2005 21:33:35 -0500 |
List-post: | <mailto:towertalk@contesting.com> |
I think it is probably really easy to overkill this problem. HFTA only
uses one datapoint per 30 meters anyway. The USGS data are 1 arc-second resolution -- same as SRTM. I think the elevation accuracy is +/- 1 meter, or maybe it is 1-meter resolution, but either way the data points are pretty far apart. I like overlaying TIGER to get the same effect as Mike gets with his aerial photo data -- either way it can help you get your tower base in the right place. As N6BV says in his HFTA documentation, trying to infuse too much meaning into a .1 or .2 difference in the weighted average gain (figure of merit) is unjustified anyway. 73, Pete N4ZR At 09:15 PM 1/13/2005, Michael Tope wrote: ----- Original Message ----- From: "W3YY" <w3yy@cox.net> _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
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