1）经纬度转换为墨卡托坐标 2） 墨卡托坐标转为经纬度
两个方法： #####1). 将经纬度转换为墨卡托坐标； #####2). 反解，将墨卡托坐标转换为经纬度坐标。
实际应用：
已知三个点两两之间的距离，以及其中两个点的经纬度坐标，推算另一个点的经纬度。
解算过程： #####1）计算已知经纬度两个点的墨卡托坐标(即将两点投影为墨卡托平面坐标系中)； #####2）计算另一点在墨卡托坐标系中，在已知两点的连线上的坐标； #####3）根据余弦定理及已知的三边的长度等信息，计算出第三点的墨卡托坐标； #####4）将获取得到的墨卡托坐标转换为经纬度。
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