IGSN71 – International Gravity Standardization Net 1971

IGSN71 is a global network of reference gravity points established in 1971 to standardize absolute and relative gravity measurements worldwide. It provides a set of well-defined gravity values and benchmarks used to calibrate instruments and link regional gravity surveys. In geodesy, IGSN71 serves as a foundational reference for gravity field modeling, geoid determination, and integration of local and global gravity data, supporting precise height systems and Earth science applications.