说明：  大地测量学科，白塞尔主题结算。 白塞尔法解算大地主题的基本思想是将椭球面上的大地元素按照白塞尔投影条件投影到辅助球面上,继而在球面上进行大地主题解算，最后再将球面上的计算结果换算到椭球面上。
(Geodesy, the settlement of Bezier theme. The basic idea of solving the geodetic theme with the Bessel method is to project the geodetic elements on the ellipsoid to the auxiliary sphere according to the Bessel projection condition, then to solve the geodetic theme on the sphere, and finally to convert the calculation results on the sphere to the ellipsoid.)