Since the beginning of this century, two international gravimetric standards have been adopted, the Potsdam system in 1909 previously and the International Gravity Standardization Network 1971 at present. The first gr...Since the beginning of this century, two international gravimetric standards have been adopted, the Potsdam system in 1909 previously and the International Gravity Standardization Network 1971 at present. The first gravity basic net of China was established in 1957 （CGBN57）. It consisted of 22 basic stations on the base of the Potsdam system with relative measurement accuracy of±0.15×10<sup>-5</sup> ms<sup>-2</sup>.展开更多
文摘Since the beginning of this century, two international gravimetric standards have been adopted, the Potsdam system in 1909 previously and the International Gravity Standardization Network 1971 at present. The first gravity basic net of China was established in 1957 （CGBN57）. It consisted of 22 basic stations on the base of the Potsdam system with relative measurement accuracy of±0.15×10<sup>-5</sup> ms<sup>-2</sup>.
