vb 高斯投影正反算 可以进行54坐标的计算-vb Gaussian operator can be both positive and negative projection coordinates calculated for 54

实现坐标转换，将54北京坐标和例如西安80、wgs84联系到一起。实现他们之间的坐标转换-Achieve coordinate conversion, coordinate and, for example 54 Beijing Xi 80, wgs84 linked together. Achieve their coordinate conversion between