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大地原点是国家大地坐标系统的起始点。解放后,我国大地坐标系统一直采用1954年北京坐标系。所谓北京坐标系是在建国初期对东北地区一等三角锁与苏联三角锁进行联测及平差所得。当时曾利用日伪时期所做的一等三角锁段,由北向南继续布设,逐步建立起我国的大地网,从而引测了苏联坐标系。而苏联坐标系采用的参考椭球体是克拉索夫斯基椭球体(长半径a=6378245米,短半径b=6356863米,扁率α=(a-b)/a=1/298.3),大地原点在列宁格勒,而不在中国。这样一来,在上海、福建、南京等
The origin of the earth is the starting point of the country’s geodetic coordinate system. After the liberation, China’s geodetic coordinate system has been using the 1954 Beijing coordinate system. The so-called Beijing Coordinate System was a joint survey and adjustment of the first-level triangle locks and the Soviet triangle locks in the Northeast during the initial period of the founding of the People’s Republic of China. At that time, the first triangulation segment made during the Japanese-Puppet period was used to continue the deployment from north to south, and gradually established our country’s land network, which led to the detection of the Soviet Union’s coordinate system. The reference ellipsoid used in the Soviet Union coordinate system is the Krasovsky ellipsoid (long radius a=6378245 m, short radius b=6356863 m, flat rate α=(ab)/a=1/298.3), and the origin of the earth is Leningrad, not in China. In this way, in Shanghai, Fujian, Nanjing, etc.