Google Maps的轨迹压缩算法，通过巧妙转换将经纬度信息编码为字符串，便于存储和传输，同时支持轻松还原。
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只需要几步就把经纬度信息巧妙的转换成了字符串，并且还原也容易。原文地址： https://developers.google.com/maps/documentation/utilities/polylinealgorithm
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