LatLong Converter

WGS84 to GCJ-02 Converter

WGS84
GCJ-02
WGS84
GCJ-02

About WGS84 Coordinate System

1Definition

WGS84 (World Geodetic System 1984) is the global standard geodetic reference system used by GPS. It defines an Earth-centered, Earth-fixed coordinate system and geodetic datum.

2Development History

Developed by the U.S. Department of Defense in 1984, WGS84 has undergone several refinements (WGS84(G730), WGS84(G873), WGS84(G1150), WGS84(G1762)) to improve accuracy through GPS satellite observations.

3Applications

WGS84 is the default coordinate system for GPS receivers worldwide. It is used in aviation, maritime navigation, Google Maps, OpenStreetMap, GIS applications, and scientific research.

GPS Compatibility

WGS84 is the native coordinate system of the Global Positioning System (GPS), ensuring direct compatibility with all GPS receivers and satellite navigation systems worldwide.

Global Standard

As the most widely adopted geodetic datum, WGS84 provides a consistent global reference frame for mapping, surveying, and geospatial data exchange across international boundaries.

High Precision

With continuous refinements, WGS84 achieves centimeter-level accuracy globally, making it suitable for high-precision applications like surveying, drone navigation, and scientific research.

About GCJ-02 Coordinate System

1Definition

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.

2Development History

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.

3Applications

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.

Encrypted Offset

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.

China Region Only

The encryption offset only applies within mainland China. Coordinates outside China pass through without modification.

Industry Standard

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.

WGS84 to GCJ-02 Conversion Guide

📐 Conversion Formula
// WGS84 → GCJ-02 transformation
dLat = transformLat(lon - 105.0, lat - 35.0)
dLon = transformLon(lon - 105.0, lat - 35.0)
radLat = lat × π / 180
magic = 1 - 0.00669342162296594323 × sin²(radLat)
sqrtMagic = √magic
dLat = (dLat × 180) / ((6335552.717 / (magic × sqrtMagic)) × π)
dLon = (dLon × 180) / ((6378245.0 / sqrtMagic × cos(radLat)) × π)
gcjLat = lat + dLat
gcjLon = lon + dLon

The GCJ-02 (Mars Coordinate) encryption applies a non-linear offset to WGS84 coordinates. The offset function uses multiple sinusoidal terms computed from the coordinate position, creating a smooth but non-reversible shift. This transformation is applied only within China's boundaries.

📋 Operation Steps
  1. Enter your WGS84 coordinates in latitude,longitude format (one pair per line)
  2. The system automatically converts from WGS84 to GCJ-02 using the standard offset algorithm
  3. Verify the output coordinates are within the expected range for your target map service
  4. Copy or download the converted coordinates for use in your application
💡 Tips
  • GCJ-02 conversion only applies within China's boundaries (latitude 3.86-53.55°N, longitude 73.66-135.05°E)
  • The offset algorithm is consistent across all implementations, so results are reproducible
  • Use batch conversion for multiple coordinates to save time

Frequently Asked Questions

The accuracy depends on the specific coordinate systems being converted. For standard geographic transformations between WGS84 and GCJ-02, typical accuracy is within sub-meter range under normal conditions. For systems requiring 7-parameter transformations, accuracy depends heavily on the quality and regional relevance of the parameters used. Always verify results for critical applications.

Yes! Our tool supports batch conversion. Simply enter multiple coordinate pairs, one per line, in the input field on this page. All coordinates will be processed simultaneously, and you can download the results as an XLSX file for further analysis or integration.

Enter coordinates in the format: latitude, longitude (one pair per line). Latitude should be the first value, longitude the second. For example: 23.05105,113.37149. Ensure latitude is between -90 and 90, and longitude is between -180 and 180.

For this conversion, standard parameters may be sufficient for most applications.

Absolutely. All coordinate conversions are performed entirely in your browser using client-side JavaScript. Your data is never sent to any server, ensuring complete privacy and security of your geographic information. This is especially important for sensitive location data.

WGS84 wgs84 (world geodetic system 1984) is the global standard geodetic reference system used by gps. it ... GCJ-02 gcj-02 (mars coordinate system) is a geodetic datum used in china for geospatial data. it applies an. The conversion between them accounts for differences in their ellipsoid parameters, datum origins, and any encryption offsets.