EPSG:4326/WGS84

  • WGS84就是EPSG:4326。
  • 世界坐标系。
  • 使用者:美国GPS、谷歌地图。

EPSG:3857/WGS84 Web Mercator

  • WGS84 Web mercator是WGS84经过伪墨卡托投影(Popular Visualization Pseudo Mercator,PVPM)得到的坐标。
  • 使用者:谷歌地图。

GCJ02

  • 天朝出的一个坐标。你懂的。
  • 又叫火星坐标。
  • 由WGS84加密而来。ヾ(。 ̄□ ̄)ツ゜゜゜
  • 只在中国地区加密,其他地区与WGS84相同。
  • 使用者:高德地图、腾讯地图、谷歌地图国内版的中国部分。

BD09

  • 百度的坐标。
  • 由GCJ02再次加密而来。
  • 分为bd09ll百度经纬度坐标,bd09mc百度墨卡托米制坐标
  • 使用者:百度地图。

扩展知识

EPSG

European Petroleum Survey Group,欧洲石油调查组织。EPSG为世界的每一个地方都制定了地图。

墨卡托投影

一种将三维球面地图投影在二维平面的方法。
* 投影后不同纬度的大小不再能完全反映真实情况,所以比例尺也不再准确
* 真实的直线投影后可能是曲线,反之亦然

分类: 其他技术

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