The computing of latitude is the key of geodetic coordinate transformation from geocentriccoordinate which conventionally USES iterative methods.
大地纬度的解算是从地心直角坐标到大地坐标变换的关键，通常都用采用迭代法实现。
2
Moreover, the local coordinate systems in the cities of our country lack in direct and precise connection to the geocentriccoordinate system and the national coordinate system.
此外，目前许多城市的地方坐标系统与国家坐标系统之间缺乏精确严格的换算关系。
3
It is an important mission of Geodesy to improve an accuracy of control networks and to establish the geocentriccoordinate system via combined satellite and terrestrial network adjustment.