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 basis of the activities is 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

Role of CCM and IAG

CCM – IAG Strategy for Metrology in Absolute Gravimetry 11 March 2014

Terms of Reference

JWG 2.1.1: Development of the International Terrestrial Gravity Reference Frame: 2023-2027

...

JWG 2.2: Absolute Gravimetry and Absolute Gravity Reference System: 2011-2015

Minutes of Working Group Meetings

Webmeeting 16. July 2026: Presentation

Webmeeting 17. February 2026:   Presentation

IAG 2025 Rimini, Italy, 3. September 2025:  Minutes | Presentation

...