The International Terrestrial Gravity Reference System & Frame (ITGRS/ITGRF) aims at providing a global and long term gravity reference based on absolute and traceable
gravity measurements such as
provided by the state-of-the-art of absolute gravity meters (corner cube or cold-atoms). This international project has been launched in 2017 through the IAG Joint Working Group
JWG 2.1.1 (Chair : H. Wziontek, BKG Germany ; Co-Chair : S. Bonvalot, BGI France).