Re: Where Exactly Is The Equator
- From: laura halliday <marsgal42@xxxxxxxxxxx>
- Date: Fri, 27 Jul 2007 09:11:21 -0700
On Jul 25, 1:08 pm, matt weber <matthew...@xxxxxxxxxxx> wrote:
On Wed, 25 Jul 2007 12:19:41 -0500, Joel <as...@xxxxxxxxx> wrote:
They had a line showing the exact location of the equator and were
performing various activities to prove it was the equator. The thing
is I had a iQue 3600 with me and it was locked in to 8 satellites with
a reported error of 25 feet and it said that the line reported as the
equator was actually 3 seconds south of the equator. My iQue reported
the Equator to be in the middle of the road where our bus was parked
outside that property some 100 to 200 yards north.
My experience is using the wrong datum can be good for an error of a
couple hundred meters. (NAD27->NAD83). 1 second is about 90 feet, so
3 seconds is well within the possible error caused by using the wrong
map datum.
I have tracked myself across the Canada-U.S. border from
Blaine, WA to White Rock, BC. It's supposed to be 49 degrees north.
GPS, however, says 49 degrees north is about 25 meters north
of the border markers. The seam in the pavement, where I-5
ends and BC 99 begins, is consistent with the markers. It is
not consistent with GPS.
I assume the border markers were surveyed according to
NAD27. This is consistent with the original routing of BC 99
(the King George Highway) which was surveyed and built
in the 1930s.
Laura Halliday VE7LDH "Non sequitur. Your ACKs are
Grid: CN89mg uncoordinated."
ICBM: 49 16.05 N 122 56.92 W - Nomad the Network Engineer
.
- References:
- Where Exactly Is The Equator
- From: Joel
- Re: Where Exactly Is The Equator
- From: matt weber
- Where Exactly Is The Equator
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