|To:||"Michael Tope" <W4EF@dellroy.com>, "W3YY" <firstname.lastname@example.org>,"TowerTalk List" <email@example.com>|
|Subject:||Re: [TowerTalk] RE: Downloading terrain data for use with HFTA|
|From:||Pete Smith <firstname.lastname@example.org>|
|Date:||Thu, 13 Jan 2005 21:33:35 -0500|
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" <email@example.com>
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.
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