[IGSMAIL-4748]: IGb00 - Update

["Ferland, Rémi"]

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IGS Electronic Mail      05 Dec 12:53:39 PST 2003      Message Number 4748
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Author: R. Ferland

Dear colleagues,

	Changes to improve the usefulness of the proposed IGb00
were made by Gerd & Jim. They suggested to include the rejected
reference frame stations such that the proposed realization
could be used on past as well as future solutions, using all the
reference frame stations available at the time.
	An updated version of the proposed IGb00 "IGS03P33_RS106.snx"
realization of ITRF2000 has just been posted at:

ftp	macs.geod.emr.ca
cd	/pub/requests/sinex/rfwg

It differs from the latest proposed realization "IGS03P33_RS99.snx"
by including the stations that were dropped between the current
"IGS01P37_RS54.snx" and the proposed realization.
Those 7 stations are:
BRMU KWJ1 OHIG SHAO THU1 TROM ZWEN.

The other 99 stations are identical between "IGS03P33_RS99.snx"
and "IGS03P33_RS106.snx". The coordinates of the 7 stations added
were extracted from the "IGS03P33.snx" solution; this ensured the
consistency of all the coordinates/velocity is maintained.

For those of you that are only concerned with the use of
the proposed realisation from the time it becomes official,
the "IGS03P33_RS99.snx" will be perfectly adequate.

The "SOLUTION/EPOCHS" block was also used to indicate the
time span for which the station coordinates are valid.
That block was also used to indicate when discontinuities
for the reference frame stations were included in the analysis.

Thanks to M. Bourassa for doing some quality check on the=20
new proposed solution.

Best Regards,
Remi,

R=E9mi Ferland
rferland at NRCan.gc.ca, 613-995-4002,  fascimile/t=E9l=E9copieur =
613-995-3215
Natural Resources Canada, 456-615 Booth Street, Ottawa, Ontario K1A 0E9
Ressources naturelles Canada, 456-615 rue Booth, Ottawa, Ontario K1A =
0E9
Government of Canada / Gouvernement du Canada