GCJ-02 to CGCS2000 Converter
About GCJ-02 Coordinate System
GCJ-02 (Mars Coordinate System) is a geodetic datum used in China for geospatial data. It applies an encrypted offset to WGS84 coordinates to comply with national regulations.
Developed by the Chinese National Bureau of Surveying and Mapping, GCJ-02 was introduced to implement the national security policy on geospatial information. Most Chinese map services use this system.
GCJ-02 is used by all Chinese government-approved map services including AMap (Gaode), Tencent Maps, and Apple Maps in China. It is required for any mapping application operating within mainland China.
GCJ-02 applies a non-linear offset algorithm to WGS84 coordinates, shifting positions by up to several hundred meters. The exact algorithm is classified by the Chinese government.
The encryption offset only applies within mainland China. Coordinates outside China pass through without modification.
GCJ-02 is the mandatory coordinate system for all commercial map services operating in China. Converting between WGS84 and GCJ-02 is essential for international data integration.
About CGCS2000 Coordinate System
CGCS2000 (China Geodetic Coordinate System 2000) is China's official national geodetic coordinate system, replacing Beijing 1954 and Xian 1980 systems. It is aligned with ITRF97.
CGCS2000 was officially adopted by the State Council of China in 2008 as the national standard.
CGCS2000 is mandatory for all official surveying, mapping, and GIS projects in China. It is used by government agencies, land management, urban planning, and infrastructure development.
CGCS2000 is aligned with the International Terrestrial Reference Frame 1997 (ITRF97) at epoch 2000.0.
CGCS2000 and WGS84 are essentially identical for most practical applications, with differences typically less than 1 meter.
CGCS2000 is supported by a nationwide network of continuously operating reference stations (CORS) across China.
GCJ-02 → CGCS2000 Conversion Guide
// GCJ-02 → CGCS2000 (via WGS84 intermediate)
// Most non-WGS84 conversions use a two-step process:
// Step 1: GCJ-02 → WGS84 (using reverse transformation)
// Step 2: WGS84 → CGCS2000 (using forward transformation)
// This ensures maximum accuracy by routing through
// the well-defined global WGS84 reference system
// rather than attempting a direct transformation{{from}} to {{to}} is performed via a two-step transformation through WGS84 as an intermediate reference system, ensuring maximum accuracy.
- Enter your GCJ-02 coordinates in the input field (latitude, longitude, one pair per line)
- Click the Convert button to transform coordinates from GCJ-02 to CGCS2000
- Review the converted CGCS2000 coordinates in the output field
- Copy the results or save them as an XLSX file for further use
- Ensure coordinates are within valid ranges before conversion
- For batch conversions, enter one coordinate pair per line
- Verify a sample of converted coordinates on your target platform
- All conversions are performed client-side for complete data privacy