For all that are interested in the GPS-SA , here is the official press
release.
http://www.whitehouse.gov/library/ThisWeek.cgi?type=p&date=1&briefing=0
One of the biggest benefits of this event is that companies will no longer
be required to fly utilising a "Real Time" differential link, (satellite or
ground). The errors with SA off are said to be of the order of +/- 8
"yards", instead of over 100 "yards".
Time will tell whether post processing of the data utilising a base station
improves the data significantly. Keep in mind that there are other errors
in the GPS signal that can be minimised by utilising a basestation at the
base of operations. These are typically atmospheric , ionospheric errors,
and while they are small in comparison to the SA error, we should still
gain accuracy by post processing the data.
I agree with Terry, this is a great GPS decision :) !
Regards,
Kevin Killin
Chief Geophysicist, Airborne Surveys
Scintrex Limited
Survey and Exploration Technology Division
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, May 02, 2000 1:55 PM
Subject: [SEGMIN]: Clinton disables GPS-SA
> At midnight last night, the Unites States disabled its intentional
> degradation of GPS signals available to the public. Known as Selective
> Availability (SA), the degradation feature was put in place to protect US
> military and government interests, but with changing times President
Clinton
> and his cabinet "realized that worldwide transportation safety,
scientific,
> and commercial interests could best be served by discontinuation of SA."
This
> means that civilian users of GPS will be able to pinpoint locations up to
ten
> times more accurately.
>
> I called Fugro's Greg Paleolog this morning to make sure my proposed HEM
> survey of the Stillwater Complex would use SA. Fugro is testing the new SA
> availability today and it looks like "differential"-GPS equipment may soon
> join buggy-whips, Cray-computers, and DOS-disks on the techno-scrape-heap
> <grin>.
>
> For you geo-day-traders out there, companies built on "differential-GPS"
> valuations may soon be in jeopardy.
>
> In all, a very good GPS decision for acquisition/field geos like me (&
glad I
> voted for Clinton.)
>
> Regards,
> Terry J. Crebs
> California Registered Geophysicist
> Lakewood, Colorado
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