| Date: | 2006-12-20 21:15:00 | |
| Sender: | Zuheir Altamimi & Jim Ray <Jim Ray (NGS 301-713-2850 x112) <jimr@ngs.noaa.gov>> | |
| Subject: | [SLR-Mail] No. 1519: ITRF session at EGU07 | |
| Author: | Zuheir Altamimi | |
| Content: | ******************************************************************************** SLR Electronic Mail 2006-12-20 21:15:00 UTC Message No. 1519 ******************************************************************************** Author: Zuheir Altamimi & Jim Ray Subject: ITRF session at EGU07 EGU 4th General Assembly -- Vienna, Austria, 15-20 April 2007 http://meetings.copernicus.org/egu2007/ Dear Colleagues, The 4th General Assembly of the European Geosciences Union will be held in Vienna, Austria, 15-20 April 2007. We draw your attention in particular to session ”G1 - The impact of technique errors on reference frame accuracy and stability”: The advance of the International Terrestrial Reference Frame (ITRF) has reached such a level of maturity that further improvements will require new insights into the systematic errors affecting all of the contributing observational techniques and the local ties that relate them. Random thermal measurement noise is generally not a significant error source any longer, but continued improvement in the sensitivity of the observing systems is nonetheless desirable as a means to better expose non-random effects. This session seeks contributions to identify the important systematic errors currently affecting ITRF realizations and to clarify the extent that those effects contaminate geodetic and geophysical results. Experiences with the ITRF2005 realization, such as possible explanations for the apparent difference in VLBI and SLR scales, are particularly relevant. Proposals for future improvements, new approaches, or novel measurement types are especially sought. SPECIAL NOTE FOR SLR COMMUNITY: With the release of ITRF2005, which shows a scale difference of ~1 ppb between the VLBI and SLR frames, we encourage contributions that shed light on this discrepancy, provide possible explanations, or elaborate the error budget for SLR scale determinations. Perhaps more important and disturbing to many users is the large shift in origin Z-component from ITRF2000 to ITRF2005 of +1.8 mm/yr, which has prompted some users to suggest that the ITRF datum be changed to adopt a conventional origin to ensure long-term stability for geophysical studies. Clarification of the intrinsic stability of SLR origin and scale determinations is urgently needed. For this, it would be highly desirable to see results from SLR solutions for the full observational history. Important Dates: 15 January 2007: Deadline for receipt of abstracts at http://www.cosis.net/members/meetings/programme/overview_db.php?m_id=40 31 March 2007: Deadline for pre-registration & hotel booking Please consider submitting a paper for this symposium or contact us directly if you have any questions. Sincerely, Jim Ray, jimr@ngs.noaa.gov Geosciences Research Division, National Geodetic Survey Zuheir Altamimi, altamimi@ensg.ign.fr ENSG/LAREG, Institut Geographique National From: Jim Ray ”(NGS” 301-713-2850 ”x112)” ******************************************************************************** |