Department of the Planetary Geodesy about The IAG Scientific Assembly 2013: 150th Anniversary of the IAG, Potsdam, 1-6.09.2013 Print E-mail
Wednesday, 20 November 2013 16:01
On 1-6 September in Potsdam The International Association of Geodesy (IAG) Scientific Assembly 2013: 150th Anniversary of the IAG was held in which employees of the Department of the Planetary Geodesy of the Space Research Center Polish Academy of Sciences (SRC PAS) actively participated.

The Congress was divided into 6 thematic sessions: Definition, Implementation and Scientific Applications of Reference Frames; Gravity Field Determination and Applications; Observing, Understanding and Assessing Earth Hazards; Science and Applications of Earth Rotation and Dynamics; Observation Systems and Services; Imaging & Positioning Techniques and Applications. The symposium was attended by 580 participants from 26 countries.

IAG Congresses are held every four year, this one was organized on the occasion of the 150th anniversary of establishment of the International Association of Geodesy. Special, ceremonial, historical session took place in the Telegrafenberg Observatory in Potsdam. The history of the International Association of Geodesy from the beginning (since 1863) until now was presented by previous presidents of the Association.

The great interest aroused session with presentations showing the development of space and satellite geodesy. Comparison of the results obtained through the use of different techniques: SLR (Satellite Laser Ranging), GNSS (Global Navigation Satellite System), VLBI (Very Long Baseline Interferometry), DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) was presented. In a block of this session  presentation of the
Astrogeodynamic Observatory of the SRC PAS and the Military University of Technology was shown. This presentation concerned the results of the earthquakes determined by GNSS and SLR techniques. It must be emphasize that the development of the GNSS technique aims at the use and the analysis of all the positioning systems (such as: American GPS, Russian GLONASS, European Galileo and Chinese COMPASS). Modern GNSS stations should be capable of  receiving signals from all of these systems. The purpose of GNNS is are also measurements in the real time - Real Time Service.

SRC PAS scientists participated also in the session:  Science and Applications of Earth Rotation and Dynamics, where they presented three lectures and a poster. Presentations were related to: determination of the Chandler wobble parameters (one of the main topic in the current polar motion research), changes of the free polar motion taken from mission GRACE observation, geodynamic research chronology in the XXth century. It was also announced that the new working group was established (Joint IAG/IAU Working Group on Theory of the Earth Rotation) which includes scientists of the Department of the Planetary Geodesy of the SRC PAS (A. Brzeziński, W. Kostek, J. Nastula).

The biggest thematic session was about determination and analysis of the Earth's gravity field and its regional changes. Mainly the contribution of the CHAMP, GRACE and GOCE satellites used for the determination of the models of the Earth’s gravity field was discussed. It is worth mentioning that professor Tapley informed that the time of GRACE mission could be extend till the end of 2016. Next mission of this type is planned for 2017.

The special session also worth seeing was about Global Geodetic Observing System (GGOS), it was organized by the Chair of the Central Bureau of IGS - Ruth Neilan.

Presentations of the SRC PAS participants:

Aleksander Brzeziński was co-chairman of the 4th session: Science and Applications of Earth Rotation and Dynamics, he was also an author of the lecture introduction to this session.

•    Aleksander Brzeziński, Marcin Rajner: Estimation of the Chandler wobble parameters based on the scholastic modeling of the observed free polar motion.

•    Jolanta Nastula, Richard Gross, Estimating the Period and Q of the Chandler Wobble from mass variability.

•    Jolanta Nastula, David Salstein, Tomasz Nagalski, Regional equivalent water thickness (EWT) based on the GRACE gravity fields, and relationship to polar motion.

•    Barbara Kołaczek, Jolanta Nastula: Chronology of developments of geodynamics investigations in XIX and XX centuries.

•    Stanislaw Schillak, Karolina Szafranek, Andrzej Araszkiewicz, Mariusz Figurski, Paweł Lejba, Marek Lehman: Earthquakes problem in ITRF position and velocity determination from SLR and GNSS data.

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Last Updated on Tuesday, 26 November 2013 16:11
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