What is Foshan unified coordinate system?

Foshan unified coordinate system is a plane coordinate system based on Xi 'an 80 series, with the central meridian 1 13 degrees and the y coordinate plus 500KM.

Foshan 2000 Independent Department will be launched after 19. Y, then add 700KM.

Foshan unified coordinate system is marked as "Foshan unified coordinate system, 1985 national elevation datum". Coordinate representation: Plane coordinates are expressed in meters, and all numbers are required, that is, 7 digits before X decimal point and 6 digits before Y decimal point. ..

Extended data:

1, National Coordinate System: In March 2008, the Ministry of Land and Resources formally submitted the Request for Instructions on Adopting the 2000 National Geodetic Coordinate System to the State Council, which was approved by the State Council in April 2008. From July 1 2008, China will fully launch the 2000 National Geodetic Coordinate System and authorize the State Bureau of Surveying and Mapping to organize its implementation.

According to the Surveying and Mapping Law of People's Republic of China (PRC) and with the approval of the State Council, China began to use the 2000 National Geodetic Coordinate System on July 1 2008. The announcement is as follows: The National Geodetic Coordinate System 2000 is the concrete embodiment of the global geocentric coordinate system in China, and its origin is the center of mass of the whole earth, including the ocean and atmosphere.

The parameters of the earth ellipsoid used in the national geodetic coordinate system in 2000 are as follows:

Long semi-axis a=6378 137m

Flatness f = 1/298+038+0.

Geocentric gravitational constant GM = 3.986004418×1014m3s-2.

Rotational angular velocity ω = 7.292l15×10-5 rad s-1.

2.Xi 'an 80 coordinate system was established at the national astronomical geodetic network adjustment conference held in Xi in April 1978. Therefore, the national geodetic coordinate system of 1980 was established. The geodetic origin of this coordinate system is located in Yongle Town, Jingyang County, Shaanxi Province, central China, about 60 kilometers north of xi 'an, so it is called 1980 Xi 'an coordinate system, also known as Xi 'an geodetic origin.

The datum is the average sea level of the Yellow Sea measured by Qingdao Dagang Tidal Station at 1952- 1979 (that is, the national elevation datum 1985). Xi 'an 80 coordinate system is a parametric coordinate system, with major axis 6378 140m, minor axis 6356755 and flatness 1/298+0438+0.

Baidu Encyclopedia-National Coordinate System

Baidu Encyclopedia -Xi 'an 80 Coordinate System