这是一个通用的地理坐标系转换工具，基于七参数转换原理，实现了毫米级别的转换。如实现了WGS-84和XIAN80坐标系统之间的相互转化，经度的转换精度为小数点后7位，纬度的转换精度为小数点后6位，平面坐标的转换精度为毫米级别。
Home Page: http://www.lgwimonday.cn/
使用了这个工具做坐标转换，感觉很好。现在头疼的是需要根据点来计算七参数。怕其他地方找的方法不使用这个代码。还请作者能够提供一套跟这个配套使用的七参数计算代码，在这里跪谢了
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