Sessions:

    1.1: International Terrestrial Reference Frame: strengths, weaknesses and strategies for future improvements

             Convener: Xavier Collilieux (France) 

             Co-conveners:  Ryan Hippenstiel (USA), Anthony Mémin (France), Zhiping Lu (China)

    1.2: Advancements and open problems in global reference frame theory and methodology （Joint with：ICCT)

             Convener: Christopher Kotsakis (Greece) 

             Co-conveners: Mathis Blossfeld (TUM, Germany) (ICCT), Junping Chen (China)

    1.3: Terrestrial and space geodetic ties for multi-technique combinations 

             Convener: Urs Hugentobler (Germany) 

             Co-convener: Krzysztof Sośnica (Poland), Weiping Jiang (China)

    1.4: Regional reference frames and networks

             Convener: Carine Bruyninx (Belgium) 

             Co-convener: Richard Stanaway (Australia), Hu Wang (China)

    1.5: Comparison and combination of space geodesy techniques for improving consistency between TRF, CRF 

          and EOPs

             Convener: Robert Heinkelmann (Germany) 

             Co-conveners: Zinovy Malkin (Russia), Manuela Seitz (Germany), Chengli Huang (China)

    1.6:Vertical Reference Systems: methodologies, realization, and new technologies (Joint with:2a2 S5 ICCT QuGe）

             Convener: George Vergos (Greece) 

             Co-conveners: Laura Sánchez (GGOS, Germany), Christopher Kotsakis (Comm.1, Greece), 

                                  Jianliang Huang (ICCT, Canada), Jakob Flury (QuGe, Germany), Tao Jiang (China)

Sessions: 

    2a.1: Terrestrial, Marine and Airborne Gravimetry  (Joint with:QuGe）

                Convener: Derek van Westrum (USA) 

                Co-conveners: Hartmut Wziontek (Germany), Michel van Camp (QuGe, Belgium), Shuqing Wu (China)

    2a.2: Vertical Reference Systems: methodologies, realization, and new technologies (Joint with:1.6 S5 ICCT QuGe）

                Convener: George Vergos (Greece) 

                Co-conveners: Laura Sánchez (GGOS, Germany), Christopher Kotsakis (Comm.1,Greece),

                                      Jianliang Huang (ICCT, Canada), Jakob Flury (QuGe, Germany), Tao Jiang (China)

    2a.3: Local and Regional Geoid and Gravity Modelling 

                Convener: Cheinway Hwang (China-Taipei) 

               Co-conveners: Hussein Abd-Elmotaal (Egypt), Wenbin Shen (China)

    2a.4: Global Gravity Field Modelling

               Convener: Roland Pail (Germany) 

               Co-convener: Daniel Barnes (USA), Xinyu Xu (China) 

    2a.5: Satellite Altimetry and Oceanography  (Joint with: 2b.4  ICCC)

               Convener: Xiaoli Deng (Australia) 

               Co-convener: Zizhan Zhang (China)

    2a.6: Gravity Inversion for Solid Earth  (Joint with: 2b.5 ICCT)

                Convener: Mirko Reguzzoni (Italy)

                Co-conveners: Robert Tenzer (ICCT, Hong Kong, China), Srinivas Bettadpur (S2b. USA), Wenke Sun (China)

    2a.7: Topography and Bathymetry Gravity Modelling  (Joint with: ICCT)

                Convener: René Forsberg (Denmark)‬‬‬‬‬‬‬‬‬‬‬

                Co-convener: Sten Claessens (Australia), Baogui Ke (China)

Sessions:

      2b.1: Analysis Techniques

                  Convener: Adrian Jäggi (Switzerland)

                  Co-convener: Andreas Kvas (Austria), Yunzhong Shen (China)

      2b.2: Spaceborne and terrestrial gravimetry for hydrology (Joint with: ICCC)

                  Convener: Wei Feng (China) 

                  Co-convener: Nico Sneeuw (Germany)

      2b.3: Cryospheric changes from gravity data  (Joint with: ICCC)

                  Convener: Andreas Groh (Germany) 

                  Co-conveners: Isabella Velicogna (USA), Bert Wouters (The Netherlands), Jiangjun Ran (China)

      2b.4: Satellite Altimetry and Oceanography   (Joint with: 2a.5  ICCC)

                  Convener: Xiaoli Deng (Australia) 

                  Co-convener: Zizhan Zhang (China)

      2b.5: Gravity Inversion for Solid Earth     (Joint with: 2a.6  ICCT)

                 Convener: Mirko Reguzzoni (Italy)

                Co-conveners: Robert Tenzer (ICCT, Hong Kong, China), Srinivas Bettadpur (S2b. USA), Wenke Sun (China)

      2b.6: Future Gravity Mission Concepts  (Joint with: QuGe)

                  Convener: Frank Flechtner (Germany)

                  Co-conveners: Wei Feng (China), Matthias Weigelt (Germany)

Sessions:

        3.1: Earth rotation, low-degree gravitational change and mass transport in geophysical fluids (Joint with: ICCC)

                  Convener: Jianli Chen (USA)

                  Co-conveners: José Ferrándiz (Spain), Richard Gross (USA), Michael Schindelegger  (Germany). 

                                          Henryk Dobslaw (Germany)，Jin Li (China)

        3.2: Observations and modeling of deformation related to changing ice loads

                  Convener: Jeff Freymueller (USA),Hansheng Wang (China)

                 Co-Conveners: Natalya Gomez (Canada), Erik R. Ivins (USA), Rebbeka Steffen (Sweden), 

                                         Bert Wouters (Netherlands)

        3.3: Geodetic observations in volcanic and tectonically active areas (Joint with: 6.3)

                   Convener: Alessandro Bonforte (Italy)

                  Co-Conveners: Emily Montgomery-Brown (USA), Takuya Nishimura (Japan),

                                         Jean-Mathieu Nocquet (France)，Chengli Huang (China)

Sessions:

        4.1: Geodetic Remote Sensing  (Joint with: ICCC)

                    Convener: Michael Schmidt (Germany)

                    Co-Conveners: Ehsan Forootan (Denmark), Ningbo Wang (China), Rosa Pacione (Italy)

                    Co-Convener: Guenther Retscher (Austria)

        4.3: Techniques and Applications in High Precision GNSS

                    Convener: Pawel Wielgosz (Poland), Xiaoming Wang (China)

                    Co-Convener: Suelynn Choy (Australia)

        5.1: Geodetic infrastructure for Earth System Monitoring

                    Convener: Michael Pearlman (USA)

                    Co-Conveners: Jian Li (China), Toshimichi Otsubo (Japan)

                    Convener: Riccardo Barzaghi (Italy)

                    Convener: Detlef Angermann (Germany)

        5.4: Geodetic space weather research

                    Convener: Michael Schmidt (Germany)

                    Co-Conveners: Ehsan Forootan (Denmark), Changhui Xu (China)

        5.5: Assimilation of geodetic observations in the modelling of the Atmosphere, Cryosphere and Hydrosphere

 (Joint with: ICCC)

                    Convener: Jianli Chen (USA)

                    Co-Conveners: Zhenghui Xie (China), Di Long (China), Mehdi Khaki (UK)

        5.6: Geodesy contributions to address societal challenges (Joint with: 5.7)

                    Convener: Basara Miyahara (Japan)

                    Co-Conveners: Yamin Dang (China), Nicholas Brown (Australia)

       5.7 : Advances in Geodesy for Geohazard Monitoring and Disaster Risk Reduction [joint session with ICCC] 

                    Convener: Allison Craddock (USA)

                    Co-Conveners: Balaji Devaraju (India) , Chuang Shi (China), Jianghui Geng (China)

Sessions:

        6.1: ICCT Geodetic Theory

                    Convener: Pavel Novák (Czech Republic), Xiaoyun Wan (China)

                    Co-Convener: Mattia Crespi (Italy)

        6.2: ICCC Geodesy for Climate Research

                    Convener: Annette Eicker (Germany)

                    Co-Conveners: Carmen Böning (USA), Wei Feng (China), Marcelo Santos (Canada)

        6.3: ICCM Seafloor geodesy, marine positioning and undersea navigation

                    Convener: YY Yang (China) 

                    Co-Convener: Heidrun Kopp (Germany) 

        6.4: QuGe Novel Sensors and Quantum Technology for Geodesy

                 Convener: Jürgen Müller (Germany)

                Co-Conveners: Jakob Flury (Germany), Michel van Camp (Belgium), Bob Spero (USA), Wenbin Shen (China)