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<div class="moz-forward-container"><span
style="font-family:"Times New
Roman","serif"">Dear Colleagues,</span><br>
<p> <span style="font-family:"Times New
Roman","serif""></span><span
style="font-family:"Times New
Roman","serif"">We would like to draw your
attention to <b>Session 1.2 "Advancements and open problems
in global reference frame theory and methodology"</b> of the
upcoming Scientific Assembly of the International Association
of Geodesy, taking place as virtual meeting between June 28 –
July 2, 2021. <br>
</span></p>
<p><span style="font-family:"Times New
Roman","serif"">This is a joint session between
IAG Commission 1 (Reference Frames) and the IAG
Inter-commission Committee on Theory (ICCT).</span><br>
<span style="font-family:"Times New
Roman","serif""> </span><br>
<span style="font-family:"Times New
Roman","serif"">Please consider to submit an
abstract to this session. See <a
href="http://www.iag2021.com/en/web/index/1646_140108__"
moz-do-not-send="true">http://www.iag2021.com/en/web/index/1646_140108__</a><span
style="mso-spacerun:yes"> </span>for this and other
sessions of the IAG Commission 1 Symposium.</span><br>
<span style="font-family:"Times New
Roman","serif""> </span><br>
<span style="font-family:"Times New
Roman","serif""><b>Abstract submission deadline
(extended for one week): <u>7th May 2021</u></b> </span><br>
<span style="font-family:"Times New
Roman","serif"">(<a
href="http://www.iag2021.com/en/web/index/1646_802946__"
moz-do-not-send="true">http://www.iag2021.com/en/web/index/1646_802946__</a>)</span><br>
<span style="font-family:"Times New
Roman","serif""> </span><br>
<span style="font-family:"Times New
Roman","serif"">We<span
style="mso-spacerun:yes"> </span>are looking forward to
your contributions. With apologies for cross-postings.</span><br>
<span style="font-family:"Times New
Roman","serif""> </span><br>
<span style="font-family:"Times New
Roman","serif"">Best regards,</span><br>
<span style="font-family:"Times New
Roman","serif""> </span><br>
<span style="font-family:"Times New
Roman","serif"">Christopher Kotsakis, Mathis
Blossfeld, Junping Chen</span><br>
</p>
<p>--------------------------------------------------------------------------------------------------------
<br>
</p>
<p><b><span lang="EN-GB">Session 1.2: Advancements and open
problems in global reference frame theory and methodology</span></b></p>
<span lang="EN-GB">The goal of this session is to provide a forum
to discuss the current state of reference systems theory and its
implementation aspects for the realization of global terrestrial
reference frames (TRFs) on the deforming Earth. It aims also to
look beyond current practices by addressing open problems, data
modeling issues and methodological advancements that are crucial
for augmenting both the long-term stability and the short-term
predictability of station positions in global TRFs. Some themes
of particular interest are: the handling of non- secular station
motions in frame estimation and the choices for their
regularized parameterization, the realization of frame origin in
relation to diverse needs of scientific users, the treatment of
geocenter motion in multi-year frame solutions, the treatment of
scale drift and its influence on the geophysical
interpretability of predicted station displacements, and the
significance of network effects along with their mitigation
strategies. The session solicits contributions covering the
complete range of topics in geodetic frame theory and
estimation, including</span><span lang="EN-GB"><span
style="mso-list:Ignore"><br>
</span></span><br>
<span lang="EN-GB"><span style="mso-list:Ignore">* <span
style="font:7.0pt "Times New Roman""></span></span></span><span
lang="EN-GB">Conceptual definitions and adequacy of adopted<span
style="letter-spacing:.15pt"> </span>conventions.</span><br>
<span lang="EN-GB">* </span><span lang="EN-GB"><span
style="mso-list:Ignore"><span style="font:7.0pt "Times
New Roman""></span></span></span><span lang="EN-GB">Improved
methods to realize global TRFs by individual space techniques
and combination<span style="letter-spacing:-1.35pt"> </span>methods.</span><br>
<span lang="EN-GB">*</span><span lang="EN-GB"><span
style="mso-list:Ignore"><span style="font:7.0pt "Times
New Roman""></span></span></span><span lang="EN-GB">
Incorporation of new data analysis models and updated processing<span
style="letter-spacing:-.45pt"> </span>strategies.</span><br>
<span lang="EN-GB">* </span><span lang="EN-GB"><span
style="mso-list:Ignore"><span style="font:7.0pt "Times
New Roman""></span></span></span><span lang="EN-GB">Better
TRF utilization and novel reference frame representations to
serve Earth science<span style="letter-spacing:-1.6pt"> </span>applications.</span><br>
<span lang="EN-GB"><span style="mso-list:Ignore">* </span></span><span
lang="EN-GB">Accuracy quantification of global TRF<span
style="letter-spacing:-.3pt"> </span>solutions.</span><span
style="font-family:Symbol" lang="EN-GB"></span><br>
<br>
<span style="mso-bidi-font-weight: normal"><span lang="EN-GB">Keywords:
</span></span><span lang="EN-GB">Global reference frames,
station kinematic models, non-secular frames, geocenter motion,
non-tidal loading, single-technique/multi-technique solutions,
scale drift, Earth science applications.</span><br>
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<pre class="moz-signature" cols="72">--
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Prof. Dr. Christopher Kotsakis AUTH - Faculty of Engineering
<a class="moz-txt-link-abbreviated" href="mailto:kotsaki@topo.auth.gr" moz-do-not-send="true">kotsaki@topo.auth.gr</a> School of Rural and Surveying Engineering
<a class="moz-txt-link-freetext" href="http://users.auth.gr/kotsaki" moz-do-not-send="true">http://users.auth.gr/kotsaki</a> Department of Geodesy and Surveying
Tel: +30-2310-996156 (NEW NUMBER) Univ Box 440, Thessaloniki, 54124, GREECE
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