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<p>Dear colleagues,</p>
<p>The <span style="mso-ansi-language: EN-US"><span
style="mso-bidi-font-weight:normal">28th General Assembly</span>
of the </span><span style="mso-ansi-language: EN-US"><span>International
Union of Geodesy and Geophysics (IUGG)</span> will take place
from <span style="mso-bidi-font-weight:normal">11-20 July 2023
in Berlin: </span></span><a class="moz-txt-link-freetext"
href="https://www.iugg2023berlin.org/">https://www.iugg2023berlin.org/</a><span
style="mso-ansi-language: EN-US"><span
style="mso-bidi-font-weight:normal"></span></span></p>
<p>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: <a
class="moz-txt-link-freetext"
href="https://www.iugg2023berlin.org/iag/#top">https://www.iugg2023berlin.org/iag/#top</a><br>
</p>
<p>Please note that the abstract submission deadline is on February
14, 2023.</p>
<p>We are very much looking forward to meeting you in Berlin!</p>
<p>Best regards,</p>
<p>Susanne Glaser,<br>
On behalf of the conveners Christopher Kotsakis, Geoff Blewitt,
Johannes Boehm, and Xavier Collilieux<span
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<p> </p>
<p class="MsoNormal"
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</span></i></b></p>
<p class="MsoNormal"
style="margin:0cm;text-indent:0cm;line-height:normal"><b
style="mso-bidi-font-weight:normal"><i
style="mso-bidi-font-style:normal"><span
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New Roman"; color:black" lang="EN-US">G01 Reference
Systems and Frames </span></i></b></p>
<p class="MsoNormal"
style="margin:0cm;text-indent:0cm;line-height:normal"><span
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<p class="MsoNormal"
style="margin:0cm;text-align:justify;text-indent:0cm;
line-height:normal"><span
style="font-size:12.0pt;mso-ascii-font-family:
Calibri;mso-fareast-font-family:"Times New
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lang="EN-US">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. </span></p>
<pre class="moz-signature" cols="72">--
Dr.-Ing. Susanne Glaser
Department 1: Geodesy
Section 1.1: Space Geodetic Techniques
Phone : +49 (0)331/288-1572
Fax : +49 (0)331/288-1759
E-mail: <a class="moz-txt-link-abbreviated moz-txt-link-freetext" href="mailto:susanne.glaser@gfz-potsdam.de">susanne.glaser@gfz-potsdam.de</a>
_______________________________________
Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
Foundation under public law of the federal state of Brandenburg
Telegrafenberg, D-14473 Potsdam</pre>
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