The activities started in 2008 with an IAG Inter-Commission Project and have been continued as Joint Working Group with IGFS, BGI and IGETS in IAG Subcommission 2.1 on Terrestrial Gravimetry.
The fundamentals are documented below.
Resolutions
2023 Berlin: IAG Resolution for the International Terrestrial Gravity Reference System (ITGRS)
2015 Prague: IAG Resolution 2: Establishment of a global absolute gravity reference system
Terms of Reference
JWG 2.1.1: Development of the International Terrestrial Gravity Reference Frame: 2023-2027
JWG 2.1.1: Establishment of the International Gravity Reference Frame: 2019-2023
JWG 2.1.1: Establishment of a Global Absolute Gravity Reference System: 2015-2019
JWG 2.2: Absolute Gravimetry and Absolute Gravity Reference System: 2011-2015
Minutes of Working Group Meetings
Webmeeting 17. February 2026: Presentation
IAG 2025 Rimini, Italy, 3. September 2025: Minutes | Presentation
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