Bill
Quick Google search gives -
ftp://lareg.ensg.ign.fr/pub/itrf/WGS84.TXT
Link -(text file) -
In general the ITRS (and its realizations ITRFyy) are identical to WGS84
at one meter level.
Meanwhile there are two types of WGS84 realization:
- old realization based on U.S. Navy Navigation Satellite System,
commonly known as DOPPLER Transit, and provided station coordinates
with accuracies of about one meter. With respect to this realization
we published, some years ago, transformation parameters between
ITRF90 and this Doppler realized system:
Parameters from ITRF90 to WGS84-Doppler realized system
T1 T2 T3 D R1 R2 R3
UNITS -----> (m) (m) (m) (ppm) (") (") (")
-----------------------------------------------------------------------
0.060 -0.517 -0.223 -0.011 0.0183 -0.0003 0.0070
- New realizations of WGS84 based on GPS data, such as WGS84(G730 or G873).
These new WGS84 realizations are coincident with ITRF at about
10-centimeter level. For these realizations there are no official
transformation parameters. This means that one can consider that
ITRF coordinates are also expressed in WGS84 at 10 cm level.
HTH - ILT
-----Original Message-----
From: Bill Thoen [mailto:[EMAIL PROTECTED]
Sent: Friday, 21 May 2004 11:17 PM
To: MapInfo-L
Subject: MI-L Does MapInfo support the ITRF 92 Datum?
Does MapInfo support the International Terrestrial Reference
Frame (ITRF) 92 datum? If not, can WGS84 be used as a substitute?
What are the differences between ITRF92 and WGS84?
Will sum...
TIA,
- Bill Thoen
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