Introduction - If you have any usage issues, please Google them yourself
n geodesy, the coordinate system is divided into two major categories: the geocentric coordinate system and the reference coordinate system. The geocentric coordinate system is the coordinate system where the origin of the coordinate system coincides with the earth's center of mass. The reference center coordinate system is the coordinate system where the origin of the coordinate system is located at the center of the reference ellipsoid, but it doesn't coincide with the centroid of the earth.