界面程序，微分法大地主题计算，包括正反算，可以选择坐标系统-this is a program for Numerical Integration of Geodesic differential equation

包括了大地主题正反算，高斯投影正反算和斜距投影，都有界面-Including earth theme and negative balance, the Gauss projection positive and negative count and slant range projection has an interface