IGRF – International Gravity Reference Frame

The International Gravity Reference Frame (IGRF) is the realization of the International Gravity Reference System (IGRS), providing a consistent global framework for gravity measurements. It is established using observations from absolute and relative gravimeters at reference stations worldwide. The IGRF enables comparisons of gravity data across regions, supports geoid determination, and underpins applications in geodesy, oceanography, and Earth system monitoring.

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