International Union of Geodesy and Geophysics (IUGG)
IUGG is a non-governmental, international scientific organization with 74 member countries under the umbrella of the International Science Council (ISC).
Through its 8 International Associations, IUGG undertakes research in geodesy and geophysics and convenes international assemblies since 1919. The International Associations offer individual membership and unite up to 10,000 scientists each.