采用C#实现高斯投影坐标转换，大地坐标与平面坐标的之间的相互转换-Gauss projection coordinate transformation, geodetic coordinate plane coordinate conversion between C#

1954北京坐标系，1980西安坐标系，WGS1984坐标系的地理坐标与大地坐标的相互转换，不包括坐标系统之间的转换。参考网上资料开发而来，经过实际数据验证，确实可用。欢迎借鉴。-1954 Beijing coordinate system, 1980 Xi' an coordinate system, WGS1984 coordinate system of geographical coordinates and geodetic coordinates of the conversi

C#编写的BHL和XYZ坐标系的相互转化(The mutual transformation of BHL and XYZ coordinate system written in C#)