[time-nuts] Thunderbolt self-survey results...
Mike Suhar
msuhar at woh.rr.com
Mon Sep 1 08:14:15 EDT 2008
You can find at "Geodesy for the Layman" at
http://www.ngs.noaa.gov/PUBS_LIB/Geodesy4Layman/toc.htm
Mike
W8RKO
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Brian Kirby
Sent: Sunday, August 31, 2008 23:14
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt self-survey results...
google "egm96" and "wgs84" to find about the geodetics used in GPS.
there is also an old paper I believe its titled "geodesy for the
layman" that will get you are started
Your topo map was probably NAVD 1929, a different vertical datum.
Brian Kd4FM
Michael Baker wrote:
> Hello, All--
>
> My Thunderbolt seems to be able to determine its
> Lat and Lon location coordinates with reasonable accuracy.
>
> However, after completing its self-survey it thinks
> its elevation is 11.2 meters when the actual elevation
> of its antenna (on my house roof) is 28.4 meters.
>
> I arrived at this value by looking at the USGS topo
> map of my property, noting the elevation ABMSL where
> my house is located and adding the distance from
> the ground to the GPS antenna on my roof and coming up
> with 28.4 meters.
>
> Should I store this value into POSITION/ALTITUDE?
>
> If I enter this value into ALTITUDE, then what?
> Should I then SAVE SEGMENT? SET ACCURATE POSITION?
>
> Thanks,
>
> Mike Baker
> WA4HFR
> Micanopy, FL
>
>
>
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