[S-GD01] Geodesy and Global Geodetic Observing System

[SGD01-01] The Global Geodetic Observing System (GGOS) - Recent activities in Japan -

*Basara Miyahara¹, Toshimichi Otsubo², Yusuke Yokota³, Kurihara Shinobu¹, Martin Sehnal⁴, Laura Sánchez⁵ (1.GSI of Japan, 2.Hitotsubashi University, 3.Institute of Industrial Science, the University of Tokyo, 4.Austrian Federal Office of Metrology and Surveying, 5.Deutsches Geodätisches Forschungsinstitut, Technical University of Munich)

Keywords:GGOS, IAG, Space geodetic technique, GGOS Japan

The Global Geodetic Observing System (GGOS) is a collaborative contribution of the global Geodesy community to the observation and monitoring of the Earth System. Geodesy is the science of determining the shape of the Earth, its gravity field, and its rotation as functions of time. Essential to reaching this goal are stable and consistent geodetic reference frames, which provide the fundamental layer for the determination of time-dependent coordinates of points or objects, and for describing the motion of the Earth in space. The geodetic observation and analysis infrastructures as well as the high-quality geodetic products provide the foundation upon which advances in Earth and planetary system sciences and applications are built. In this way, GGOS endeavors to facilitate and enable production and sharing of the Earth observations needed to monitor, map, and understand changes in the Earth’s shape, rotation, and mass distribution. GGOS also advocates the global geodetic frame of reference as the fundamental backbone for measuring and consistently interpreting global change processes as well as the essential geospatial infrastructure to ensure a homogeneous and sustainable development worldwide. GGOS closely works with its parent organization, the International Association of Geodesy (IAG), especially its components, the IAG Services, the IAG Commissions and IAG Inter-Commission Committees to keep these fundamental geodetic contributions sustainable. Additionally, GGOS supports the IAG by strengthening external and interdisciplinary relations and contributions to the broader geospatial information community, including relevant United Nations groups, in particular, the United Nations Committee of Experts on Global Geospatial Information Management (UN-GGIM), its Subcommittee on Geodesy, and the new UN Global Geodetic Centre of Excellence (scheduled to commence operations in early 2023). The main contribution of GGOS in this regard is to support actions and initiatives to communicate the value of Geodesy to society as well as to help to understand and solve complex issues facing the global Geodesy community. Towards this objective, GGOS is developing a comprehensive Geodesy portal (https://ggos.org/) including detailed descriptions of geodetic observations (https://ggos.org/obs/) and products (https://ggos.org/products/), and various outreach tools such as short videos to explain the roles and importance of Geodesy. Participation from regions and countries is essential for global geodesy and a key enabler for GGOS to make its activities more sustainable. GGOS Affiliate is a GGOS component to enlarge participation form regions and countries. The first GGOS Affiliate, GGOS Japan was established in 2017 and have been working to strengthen collaboration between GGOS and geodetic organizations/institutions in Japan. The second GGOS Affiliate, GGOS D-A-CH was established in 2021. GGOS Japan and GGOD D-A-CH have conducted joint activities such as online meetings and an exchange of a researcher. For further enhancement of geodesy outreach, GGOS Japan developed and published a video of VLBI-GNSS local tie survey at Ishioka Geodetic Station in 2022 at GGOS Youtube channel (https://www.youtube.com/@iag-ggos/videos). In addition, GGOS Japan has supported Geodetic Society of Japan to launch and operate mechanism to assign DOIs for geodetic dataset in Japan. Through these activities, GGOS Japan is contributing to GGOS by strengthening collaboration among organizations/institutions in Japan and supporting their participation to GGOS.