Map Coordinate Conversion Tool

WGS84 Coordinate System:International standard coordinate system, coordinates directly output by GPS devices, used by Google Earth.

GCJ02 Coordinate System (Mars Coordinates):Coordinate system mandated by China's National Bureau of Surveying and Mapping, encrypted and offset based on WGS84. Used by Amap, Tencent Maps, and Google Maps China.

BD09 Coordinate System:Coordinate system used by Baidu Maps, further encrypted based on GCJ02.

Notes:

• When using map services within China, ensure coordinate systems match to avoid location offsets.
• Conversion algorithms are based on publicly available methods; minor accuracy errors may occur.
• Regions outside mainland China typically use the WGS84 coordinate system.