From rweber at luna.tuwien.ac.at Tue Nov 20 21:22:44 2001 From: rweber at luna.tuwien.ac.at (Weber Robert) Date: Tue, 20 Nov 2001 21:22:44 MET Subject: [IGSMAIL-3605]: Towards ITRF2000 Message-ID: <200111202022.VAA02175@luna.tuwien.ac.at> ****************************************************************************** IGS Electronic Mail 20 Nov 12:22:49 PST 2001 Message Number 3605 ****************************************************************************** Author: AC Coordinator Dear IGS colleagues, Pleased be informed that IGS Analysis Centers will begin to use the IGS realization of ITRF2000 (IGS00) with GPS week 1143, which starts on December 2, 2001. This implies that simultaneously all IGS products will be based on ITRF2000. At the same time the set of reference stations (RF) will be slightly enhanced from 51 to 54 sites. Included below is preliminary information from the IGS Reference Frame Coordinator, Remi Ferland, on the transformation parameters between IGS97 and IGS00. best regards, Robert Weber ps: The complete set of ITRF2000 coordinates may be found at: ftp://lareg.ensg.ign.fr/pub/itrf/itrf2000 ----------------------------------- The current station changes between IGS97 and IGS00 are: Removed : BRAZ, AREQ Added : ASC1, CEDU, DGAR, LPGS, RIOG The estimated transformation parameters between IGS97 and IGS00 are given below. For consistency, they were estimated as the previous one (IGS96 - IGS97). The parameters are estimated without using the covariance info. Transformation from IGS(ITRF97) to IGS(ITRF2000) at epoch 01-JAN-1998: ==================================================================== TX TY TZ RX RY RZ D mm mm mm mas mas mas ppb Offset -6.0 -5.6 20.1 -0.040 0.001 -0.043 -1.403 +/- 2.5 3.3 5.1 .053 .060 .036 .12 -------------------------------------------------------------------- dTX dTY dTZ dRX dRY dRZ dD mm/y mm/y mm/y mas/y mas/y mas/y ppb/y Drift 0.4 0.8 1.5 0.004 -0.001 -0.030 -0.012 +/- 1.7 1.9 2.8 .038 .040 .034 .12 -------------------------------------------------------------------- * The IERS convention for the transformation parameters was followed. * The equivalent changes in polar motion, in the sense (ITRF2000 - ITRF97), may be obtained using PMx = RY and PMy = RX. When propagated at epoch 02-DEC-2001: Transformation from IGS(ITRF97) to IGS(ITRF2000) ==================================================================== TX TY TZ RX RY RZ D mm mm mm mas mas mas ppb Offset -4.5 -2.4 26.0 -0.024 -0.004 -0.159 -1.451 +/- 4.1 5.0 7.5 .092 .099 .076 .27 -------------------------------------------------------------------- dTX dTY dTZ dRX dRY dRZ dD mm/y mm/y mm/y mas/y mas/y mas/y ppb/y Drift 0.4 0.8 1.5 0.004 -0.001 -0.030 -0.012 +/- 1.7 1.9 2.8 .038 .040 .034 .12 -------------------------------------------------------------------- The sigmas in the second table were only a propagation of the ones in the first table. There are two files IGS01P37_RS54.snx and IGS01P37_RS54.notes with the necessary information available at macs.geod.emr.ca cd /pub/requests/sinex/rfwg -- ___________________________________________________________________________ Robert Weber Tel: ++43-1-58801-12865 Department of Advanced Geodesy Fax: ++43-1-58801-12896 University of Technology, Vienna E-Mail: rweber at luna.tuwien.ac.at Gusshausstrasse 27-29 robert.weber at aiub.unibe.ch A-1040 Vienna, Austria ___________________________________________________________________________