LatLong Converter

BD-09 to GCJ-02 Converter

BD-09
GCJ-02
BD-09
GCJ-02

About BD-09 Coordinate System

1Definition

BD-09 (Baidu Coordinate System) is a geodetic system developed by Baidu, based on GCJ-02 with additional encryption for use in Baidu Maps and related services.

2Development History

Baidu developed BD-09 by applying a secondary encryption layer on top of GCJ-02 to further obfuscate coordinates. It is proprietary to Baidu and used exclusively in their mapping ecosystem.

3Applications

BD-09 is used exclusively in Baidu Maps, Baidu Navigation, and Baidu LBS API. It is the most encrypted coordinate system among Chinese map services.

Double Encryption

BD-09 adds a second encryption layer on top of GCJ-02, making it the most heavily obfuscated coordinate system used in China.

Baidu Ecosystem

Used exclusively within Baidu's mapping platform. If you're developing with Baidu Maps API, all coordinates must be in BD-09 format.

Third-party Conversion

Conversion between BD-09 and other systems relies on reverse-engineered algorithms that provide sub-meter accuracy.

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.

BD-09 to GCJ-02 Conversion Guide

📐 Conversion Formula
// BD-09 → GCJ-02 (via WGS84 intermediate)
// Most non-WGS84 conversions use a two-step process:

// Step 1: BD-09 → WGS84 (using reverse transformation)
// Step 2: WGS84 → GCJ-02 (using forward transformation)

// This ensures maximum accuracy by routing through
// the well-defined global WGS84 reference system
// rather than attempting a direct transformation

BD-09 to GCJ-02 is performed via a two-step transformation through WGS84 as an intermediate reference system, ensuring maximum accuracy.

📋 Operation Steps
  1. Enter your BD-09 coordinates in the input field (latitude, longitude, one pair per line)
  2. Click the Convert button to transform coordinates from BD-09 to GCJ-02
  3. Review the converted GCJ-02 coordinates in the output field
  4. Copy the results or save them as an XLSX file for further use
💡 Tips
  • 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

Frequently Asked Questions

The accuracy depends on the specific coordinate systems being converted. For standard geographic transformations between BD-09 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.

BD-09 bd-09 (baidu coordinate system) is a geodetic system developed by baidu, based on gcj-02 with additi... 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.