[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
> 
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
> 

_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.




More information about the time-nuts mailing list