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各种坐标系互相转换（WGS84转换BD-09主要）-11954104
source link: http://blog.51cto.com/11964104/2121131
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背景：最近用百度地图加载几万个点，然后画多边形和线段，用百度API提供的方法一次转10个，超级慢，我就在后台调用转换方法，直接页面上去展示，结果7万个点画到地图用了几秒时间。分享一下，感觉有用点赞，还有一些其他的转换方法-------packageusi.distance.method;publicclassTransform{staticdoublex_PI=3.1415926535897932
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