ThelAG is organised into Commissions, Services, the Global Geodetic Observing System (GGOS) and the Inter-Commission Committee on Theory (ICCT), each of which has established a number of Working Groups and Study Groups. Details can be found in the Geodesists' Handbook. The ICCT was formally established after the IUGG XXI Assembly in Sapporo, Japan, in 2003 to succeed the former IAG Section IV on General Theory and Methodology and, more importantly, to directly link across all other IAG entities. The overall objectives of the ICCT are to act as an international focus of theoretical geodesy, to encourage and initiate activities to advance geodetic theory in all branches of geodesy, and to monitor developments in geodetic methodology. To achieve these objectives, the ICCT interacts and collaborates with all IAG entities.
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