[IGSMAIL-8056] IAG 2021 Scientific Assembly, Session 1.2 (abstract submission dateline extended)

[C. Kotsakis]

Dear Colleagues,

We would like to draw your attention to *Session 1.2 "Advancements and 
open problems in global reference frame theory and methodology"* of the 
upcoming Scientific Assembly of the International Association of 
Geodesy, taking place as virtual meeting between June 28 – July 2, 2021.

This is a joint session between IAG Commission 1 (Reference Frames) and 
the IAG Inter-commission Committee on Theory (ICCT).

Please consider to submit an abstract to this session. See 
http://www.iag2021.com/en/web/index/1646_140108__ 
<http://www.iag2021.com/en/web/index/1646_140108__>for this and other 
sessions of the IAG Commission 1 Symposium.

*Abstract submission deadline (extended for one week): _7th May 2021_*
(http://www.iag2021.com/en/web/index/1646_802946__ 
<http://www.iag2021.com/en/web/index/1646_802946__>)

Weare looking forward to your contributions. With apologies for 
cross-postings.

Best regards,

Christopher Kotsakis, Mathis Blossfeld, Junping Chen

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*Session 1.2: Advancements and open problems in global reference frame 
theory and methodology*

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

* Conceptual definitions and adequacy of adoptedconventions.
* Improved methods to realize global TRFs by individual space techniques 
and combinationmethods.
*Incorporation of new data analysis models and updated processingstrategies.
* Better TRF utilization and novel reference frame representations to 
serve Earth scienceapplications.
* Accuracy quantification of global TRFsolutions.

Keywords: Global reference frames, station kinematic models, non-secular 
frames, geocenter motion, non-tidal loading, 
single-technique/multi-technique solutions, scale drift, Earth science 
applications.
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Prof. Dr. Christopher Kotsakis       AUTH - Faculty of Engineering
kotsaki at topo.auth.gr                  School of Rural and Surveying Engineering
http://users.auth.gr/kotsaki          Department of Geodesy and Surveying
Tel: +30-2310-996156 (NEW NUMBER)    Univ Box 440, Thessaloniki, 54124, GREECE
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