Convert between WGS84 / GCJ-02 / BD-09 coordinate systems for China map offset correction
WGS-84 (GPS)
—
GCJ-02 (Amap/Tencent)
—
BD-09 (Baidu)
—
Coordinate System Info
WGS-84:International standard used by GPS devices, Google Earth, and OpenStreetMap.
GCJ-02 (Mars Coordinates):Encrypted coordinate system mandated by China's Bureau of Surveying. Used by Amap, Tencent Maps, and Google Maps China. Raw WGS-84 coordinates will be offset by 100-700 meters in China.
BD-09 (Baidu Coordinates):Baidu's proprietary system with an additional encryption layer on top of GCJ-02. Used only by Baidu Maps.