************************************************************************ IERS Message No. 465 December 15, 2022 ************************************************************************ IUGG2023: IAG Session G01 Reference Systems and Frames Dear colleagues, The 28th General Assembly of the International Union of Geodesy and Geophysics (IUGG) will take place from 11 to 20 July 2023 in Berlin: https://www.iugg2023berlin.org/ There will be a session G01 "Reference Systems and Frames" within the International Association of Geodesy (IAG) Symposia. We would like to encourage you to participate and submit an abstract to this session covering various topics including terrestrial and celestial reference frames as well as their geodetic applications. Please find below the session description, also available here: https://www.iugg2023berlin.org/iag/#top Please note that the abstract submission deadline is on February 14, 2023. We are very much looking forward to meeting you in Berlin! Best regards, Susanne Glaser, On behalf of the conveners Christopher Kotsakis, Geoff Blewitt, Johannes Boehm, and Xavier Collilieux G01 Reference Systems and Frames Reference systems and frames are of primary importance for scientific research, satellite navigation, and geospatial applications. A precisely defined and accurate reference frame improves our understanding of the Earth's system and its time variations, including Earth's variable rotation and gravity field, sea level changes and their global environmental impact, tectonic plate motion, glacial isostatic adjustment, geocenter motion, deformation due to the earthquake cycle, terrestrial water storage, ice-sheet melting, ocean and atmospheric loading, and volcanism. An accurate reference frame is also needed to position GNSS, SLR and DORIS satellites, and any Earth observation satellite or aircraft with geodetic sensors such as those used for ocean and ice-sheet altimetry, InSAR, gravimetry, and LiDAR. Furthermore, self-consistency is required to connect the terrestrial frame, celestial frame, and Earth rotation to realize the inherent stability in orientation and scale provided by VLBI quasar observations. Co-location, whether it be on the ground or in space as planned with VLBI transmitters on satellites, is essential to tie the various space geodetic techniques together into one consistent global reference system to be used for Earth monitoring. For this symposium, we solicit presentations dealing with theoretical aspects of reference systems and the practical realization of the celestial, global and regional terrestrial reference frames, as well as their various applications like those mentioned above, and beyond. The contributing role of space geodetic techniques in the realization of the origin and scale of global frames through new and improved modeling of their systematic errors and novel exploitations of LEO satellites is also a topic of great interest for this symposium. We also solicit presentations on new and emerging technologies applicable to the future of reference frames such as inter-satellite links, as well as relativistic and quantum geodetic sensors. ************************************************************************ IERS Messages are edited and distributed by the IERS Central Bureau. If not stated otherwise, the IERS is only the distributor of the message and is not responsible for its content. To submit texts for distribution, please write to . To subscribe or unsubscribe, please create an IERS account or modify it: https://www.iers.org/Login/Login/EN/login_node.html or write to . Archives: http://www.iers.org/IERS/Messages ************************************************************************