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Informations about the package coords
coords
提供了坐标距离计算；百度坐标（BD09）、国测局坐标（火星坐标，GCJ02）、和WGS84坐标系之间的转换
距离计算代码参考：https://stackoverflow.com/questions/10053358/measuring-the-distance-between-two-coordinates-in-php
坐标转换代码参考：https://github.com/wandergis/coordtransform
当前互联网地图的坐标系现状
地球坐标 (WGS84)
- 国际标准，从 GPS 设备中取出的数据的坐标系
- 国际地图提供商使用的坐标系
火星坐标 (GCJ-02)也叫国测局坐标系
- 中国标准，从国行移动设备中定位获取的坐标数据使用这个坐标系
- 国家规定： 国内出版的各种地图系统（包括电子形式），必须至少采用GCJ-02对地理位置进行首次加密。
百度坐标 (BD-09)
- 百度标准，百度 SDK，百度地图，Geocoding 使用
- (本来就乱了，百度又在火星坐标上来个二次加密)
开发过程需要注意的事
-
从设备获取经纬度（GPS）坐标
如果使用的是百度sdk那么可以获得百度坐标（bd09）或者火星坐标（GCJ02),默认是bd09 如果使用的是ios的原生定位库，那么获得的坐标是WGS84 如果使用的是高德sdk,那么获取的坐标是GCJ02 -
互联网在线地图使用的坐标系
火星坐标系： iOS 地图（其实是高德） Google国内地图（.cn域名下） 搜搜、阿里云、高德地图、腾讯 百度坐标系： 当然只有百度地图 WGS84坐标系： 国际标准，谷歌国外地图、osm地图等国外的地图一般都是这个
All versions of coords with dependencies
PHP Build Version
Package Version
Requires
php Version
>=5.3
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