HR: 10:20h
AN: G32A-01 INVITED     [Abstracts]
TI: ITRF2004: Results, Limitations and Lessons for Future Improvements
AU: * Altamimi, Z
EM: altamimi@ensg.ign.fr
AF: Institut Geographique National ENSG/LAREG, 6-8 Avenue Blaise Pascal, Champs-sur-Marne, 77455 France
AU: Collilieux, X
EM: xavier.collilieux@ensg.ign.fr
AF: Institut Geographique National ENSG/LAREG, 6-8 Avenue Blaise Pascal, Champs-sur-Marne, 77455 France
AU: Boucher, C
EM: claude.boucher@espace.gouv.fr
AF: Conseil General des Ponts et Chaussees, Tour Pascal B, La Defense, 92055 France
AB: The International Terrestrial Reference Frame (ITRF) is a standard multi-technique combined frame for Earth Science applications which range from subtle geophysical processes to global phenomena as for example the mean sea level variations. Accuracy, reliability and long-term stability of the ITRF are the main challenges to achieve, without degrading the quality of the individual contributing techniques or contaminating the resulting combined frame with systematic errors. Contrary to the previous ITRF versions where global solutions were used, the ITRF2004 input data are time series of station positions and Earth Orientation Parameters (EOPs). This new approach allows to better monitor the behavior of station non-linear motions as well as to ensure the consistency between the ITRF and IERS EOPs. Pertinent results of the ITRF2004 will be presented and used as guidance to underline, and to further investigate for future improvements, limitations, weaknesses and systematic errors. A special focus will be given to discuss combination methodology, importance and impact of local ties, technique-specific systematic errors, current VLBI, SLR, GPS and DORIS networks configuration and their impact on the ITRF datum definition.
DE: 1229 Reference systems
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
DE: 1295 Integrations of techniques
SC: Geodesy [G]
MN: Fall Meeting 2005