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What is the mathematical difference between Gaussian plane rectangular coordinate system and Cartesian rectangular coordinate system?
There are three differences between the rectangular coordinate system of the measuring plane and the rectangular coordinate system of the mathematical plane (Cartesian coordinate system): (1) The measuring coordinate system takes the north-south line passing through the origin, that is, the meridian, as the ordinate axis and takes it as the x axis; The east-west line passing through the origin is the abscissa axis and designated as the Y axis (the abscissa axis of the mathematical coordinate system is the X axis and the ordinate axis is the Y axis). (2) The rectangular coordinate system takes the positive direction of the X axis as the starting edge, and rotates the azimuth φ and I, II, III and IV quadrants clockwise (the mathematical coordinate system takes the positive direction of the X axis as the starting edge and rotates the inclination θ counterclockwise, which is divided into I, II, III and IV quadrants). (3) X) is mostly two big positive integers, such as Beijing local coordinate system origin coordinate y = 500,000m and x = 300,000m (mathematical coordinate origin coordinate x=0, y=0). Mathematically, the plane rectangular coordinates take the longitudinal axis as the Y axis, which is positive from the origin and negative from the origin; Taking the horizontal axis as the X axis, it is positive to the right and negative to the left from the origin; Quadrants are numbered counterclockwise. ? The plane rectangular coordinate system in the measurement takes the longitudinal axis in the north-south direction as the X axis, which is positive from the origin to the north and negative from the south; Taking the horizontal axis of the east-west direction as the Y axis, it is positive from the origin to the east and negative from the west; Quadrants are numbered clockwise.