The International Gravity Standardization Net 1971 (I.G.S.N.71)
A worldwide network, consisting of 24,000 gravimeter, 1,200 pendulum and 10 absolute measurements collected over twenty years was adjusted by a small Working Group of the International Association of Geodesy. The concept differs from that of earlier gravity reference systems in that datum is determined not by an adopted value at a single station, but by the gravity values for 1854 stations obtained from a single least squares adjustment of absolute, pendulum and gravimeter data. The use and maintenance of the system is discussed
Print Book, English, 31 MAY 1972
Defense Technical Information Center, Ft. Belvoir, 31 MAY 1972