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| International Geodetic Commission | |
|---|---|
| Name | International Geodetic Commission |
| Abbreviation | IGC |
| Formation | 19th century |
| Type | Scientific commission |
| Purpose | Geodesy, surveying, cartography |
| Headquarters | International |
| Region served | Worldwide |
| Parent organization | International Union of Geodesy and Geophysics |
International Geodetic Commission The International Geodetic Commission is a scientific commission dedicated to advancing geodesy, surveying, cartography, Earth observation, and related geoinformation sciences. It coordinates international efforts in reference systems, gravity field determination, geodetic networks, and satellite geodesy, interacting with organizations such as the International Astronomical Union, World Meteorological Organization, United Nations, European Space Agency, and National Aeronautics and Space Administration.
The commission traces origins to 19th-century efforts like the International Meridian Conference and the Paris Meridian work, evolving through collaborations exemplified by the International Association of Geodesy, the International Union of Geodesy and Geophysics, and the geodetic components of the International Geophysical Year. During the 20th century it engaged with projects such as the Great Trigonometrical Survey of India, the European Datum 1950, and the development of the World Geodetic System 1972. Post‑Cold War expansions linked the commission with initiatives like the Global Positioning System, GLONASS, and the International Terrestrial Reference Frame, reflecting interactions with agencies including the National Oceanic and Atmospheric Administration, Deutsches GeoForschungsZentrum, and the Japanese Aerospace Exploration Agency.
The commission functions within the framework of the International Union of Geodesy and Geophysics and collaborates with bodies such as the International Association of Geodesy, the International Cartographic Association, and the International Hydrographic Organization. Membership comprises national delegates from institutions like the United States Geological Survey, British Geological Survey, Institut Géographique National, Geological Survey of Canada, and academic centers such as ETH Zurich, Massachusetts Institute of Technology, University of Cambridge, University of Bonn, and Peking University. Leadership roles include elected presidents, vice presidents, and working group chairs, often drawn from laboratories including the Ohio State University, CNES, GFZ Potsdam, and the Scripps Institution of Oceanography.
Activities span establishment of terrestrial and celestial reference frames, gravity field modeling, tide gauge networks, and geodynamic monitoring using instruments and techniques linked to Very Long Baseline Interferometry, Satellite Laser Ranging, Global Navigation Satellite System receivers, and Doppler Orbitography and Radiopositioning Integrated by Satellite. The commission coordinates research on post‑glacial rebound studied in contexts like Fennoscandia and Greenland and on crustal deformation observed in seismic zones such as the San Andreas Fault and the Himalayas. It interfaces with programs including International GNSS Service, International VLBI Service for Geodesy and Astrometry, International Laser Ranging Service, and the Global Geodetic Observing System.
Major contributions include support for the establishment and maintenance of the International Terrestrial Reference Frame, contributions to the realization of the World Geodetic System, and inputs to the definition of the International Celestial Reference Frame. The commission has influenced sea level research through collaboration with the Permanent Service for Mean Sea Level and the Intergovernmental Oceanographic Commission. It contributed to continental datum unification such as European Terrestrial Reference System 1989 and regional efforts like the North American Datum revisions. Partnerships with satellite missions—LAGEOS, GRACE, GOCE, and Sentinel series—helped refine gravity models including those used in the development of geopotential models and global vertical datum concepts discussed by bodies like the International Hydrographic Organization.
The commission issues technical reports, recommendations, and guides that feed into standards promulgated by organizations such as the International Organization for Standardization and the International Telecommunication Union when relevant. Its outputs often inform manuals used by national mapping agencies including the Ordnance Survey, standards committees within the European Space Agency, and academic textbooks from presses affiliated with Cambridge University Press and Springer. It has produced guidelines on reference frames, transformation parameters between datums like the European Datum 1950 and European Terrestrial Reference System 1989, and protocols adopted by services including the International GNSS Service.
The commission organizes symposia and workshops in conjunction with international gatherings such as the General Assembly of the International Union of Geodesy and Geophysics, the International Cartographic Conference, and meetings of the United Nations Committee of Experts on Global Geospatial Information Management. Conferences often rotate among host institutions including ETH Zurich, Université Grenoble Alpes, University of Tokyo, National Observatory of Brazil, and venues associated with the International Astronomical Union. Collaboration extends to intergovernmental programs like the Global Geodetic Observing System and regional initiatives such as the Pan American Institute of Geography and History.
Category:Geodesy Category:International scientific organizations