What are the survey coordinate systems used in China?

China uses four measuring coordinate systems:

1, Beijing 54 coordinate system

2.xi 'an 80 coordinate system: The geodetic origin of this coordinate system is located in Yongle Town, Jingyang County, Shaanxi Province, about 60 kilometers north of Xi 'an.

3.2000 National Geodetic Coordinate System: CGS2000 for short, namely China Geodetic Coordinate System 2000. The z axis points to the protocol polar (BIH international current situation) defined by BIH 1984.0, the x axis points to the intersection of the zero meridian plane defined by BIH 1984.0 and the protocol equator, and the y axis is determined by the right-hand coordinate system.

4. 1985 National Elevation Standard: 1956, China stipulated that the average sea level of the Yellow Sea (Qingdao) for many years should be used as a unified benchmark, and it was called "Yellow Sea elevation system", which was the first country in China, elevation system.

The ground survey coordinate system usually refers to the plane rectangular coordinates (such as 1954 Beijing coordinate system or 1985 national reference elevation) which are projected by Gauss-Kruger belt 6 or belt 3 (or any belt) based on the spatial geodetic datum.

The ground survey coordinate system usually refers to the plane rectangular coordinates (such as 1954 Beijing coordinate system or 1985 national reference elevation) which are projected by Gauss-Kruger belt 6 or belt 3 (or any belt) based on the spatial geodetic datum. T-x, Y, Z. Finally, the coordinates of ground points obtained by photogrammetry will be provided to users in this coordinate form.