Support batch conversion between WGS84 (GPS), GCJ02 (China Mars), BD09 (Baidu) coordinate systems.
Features
- 3 Coordinate Systems: Support WGS84, GCJ02 and BD09 bidirectional conversion.
- Batch Conversion: Support multiple coordinates conversion at once with table view.
- CSV Export: Export conversion results as CSV file for further processing.
- Real-time Conversion: Instant conversion with high precision calculation algorithm.
Use Cases
- Map applications and navigation: Convert GPS coordinates (WGS84) to formats compatible with Chinese map services (GCJ02, BD09) for integration with Amap, Baidu Maps, and Google Maps China. Essential for navigation apps, delivery services, vehicle tracking, and fleet management systems operating in mainland China.
- Mobile app development: Integrate coordinate conversion into iOS and Android apps to ensure GPS-captured locations display correctly on Chinese maps. Useful for ride-sharing apps, food delivery services, real estate apps, and location-based services requiring compatibility with multiple map systems.
- Geographic data analysis: Convert large coordinate datasets between systems for GIS analysis, geographic research, and sensor data processing. Useful for researchers, data analysts, and developers working with location data from multiple sources who need to standardize formats for comparative analysis.
- Enterprise system integration: Synchronize location data between systems using different coordinate formats. Essential for ERP systems, logistics platforms, warehouse management systems, and enterprise applications integrating GPS data, IoT devices, and Chinese and international map services.
Usage Guide
- Select Systems: Choose source and target coordinate systems.
- Input Coordinates: Enter longitude and latitude, or use batch input.
- Convert: Click convert button to get results.
- Export: Export results as CSV or copy individual coordinates.
Technical Details
WGS84 (World Geodetic System 1984)
WGS84 is the standard coordinate system used by GPS satellites worldwide. It is based on the Earth ellipsoid model and provides accurate global positioning. Most international mapping services and GPS devices use WGS84 coordinates directly.
GCJ02 (China Geodetic Coordinate System 2002)
GCJ02, also known as Mars Coordinates, is the mandatory coordinate system for Chinese maps regulated by the State Bureau of Surveying. It applies an obfuscation algorithm to WGS84 coordinates for national security reasons. Services like Amap (Gaode) and Google Maps China use GCJ02.
BD09 (Baidu Coordinate System 2009)
BD09 is Baidu's proprietary coordinate system developed in 2009. It applies additional encryption on top of GCJ02, making it incompatible with other map services. Baidu Maps exclusively uses BD09 coordinates, requiring conversion when integrating with other systems.
Frequently Asked Questions
- Why do I need a coordinate converter?
- Different mapping services and GPS systems use different coordinate systems. WGS84 is the global GPS standard, GCJ02 is used by Chinese mapping services (like Google Maps China), and BD09 is used by Baidu Maps. Converting between these systems is essential for accurate location data when working with international and Chinese mapping services, GPS devices, and geographic information systems.
- What coordinate systems are supported?
- The tool supports three major coordinate systems: WGS84 (World Geodetic System 1984), the global GPS standard used worldwide; GCJ02 (also known as Mars coordinate system), used by Chinese mapping services including Google Maps China and Gaode Maps; and BD09, used by Baidu Maps. All conversions are bidirectional, allowing you to convert from any system to any other system.
- How accurate are coordinate conversions?
- Conversions use standard algorithms with high precision. WGS84 to GCJ02 and GCJ02 to BD09 conversions maintain accuracy within meters, suitable for most mapping and navigation applications. The tool processes coordinates with sufficient decimal precision to ensure accurate results for GPS coordinates, mapping services, and geographic data analysis.
- Can I convert multiple coordinates at once?
- Yes, the tool supports batch conversion. You can add multiple rows of coordinates, import coordinates from CSV files, or paste multiple coordinates in batch input format (one coordinate per line). All coordinates are converted simultaneously, and you can export the results to CSV for further processing or analysis.
- Are my coordinate data processed securely?
- Yes, all conversions are performed entirely in your browser using client-side JavaScript. Your coordinate data never leaves your device or is uploaded to a server. All calculations occur locally in your browser's memory, and data is discarded when you close the page, ensuring privacy for sensitive location data.
Related Documentation
- WGS84 Official Specification - World Geodetic System 1984 technical documentation.
- China Surveying and Mapping Law - Regulations on geographic information security in China.
- Coordinate Transformation Algorithm - Mathematical principles of coordinate system conversion.
- eviltransform Library - Open source coordinate conversion library implementation.
- Geodetic Coordinate Systems - Comprehensive guide to global coordinate systems.