高斯投影的正解算法，用c++实现的，在vc环境下，中央经线是117-Positive Solutions of Gauss projection algorithm, implemented with c++, vc environment in the central meridian is 117

大地测量学坐标正反算，可以选择不同的坐标系，设置中央子午线，进行大地坐标和高斯投影坐标之间的转换-Geodesy coordinates reverse calculation, you can a different coordinate system, set the central meridian, convert geodetic coordinates and Gauss projection coordinates between