ISG' activities are on educational, research, and data distribution sides: principal purposes of ISG are the collection and distribution of geoid models, the collection and distribution of software for geoid computation, and the organization of technical schools on geoid determinations. ISG collects and disseminates worldwide local and regional geoid models estimated by geodetic Institutions and researchers of many countries.
More than 30 countries are represented, listed in alphabetic order or localized on a map
ISG is covered by Thomson Reuters Data Citation Index. ISG has been founded in 1992 (as International Geoid Service - IGeS) as a working arm of International Geoid Commission (IGeC), and it is actually an official Service of the International Association of Geodesy (IAG).