Latitude & Longitude Coordinate Converter

Latitude & Longitude Coordinate Converter: Core Features & Principles

When switching between different map platforms (such as GPS devices, Amap, or Baidu Maps), differences in coordinate systems can cause location offsets. This tool uses professional algorithms to achieve precise conversions between the three major coordinate systems: WGS84 (international GPS standard), GCJ02 (China's Mars coordinate system), and BD09 (Baidu coordinates), outputting latitude and longitude data tailored to your target map platform.

Why Choose Our Coordinate Converter?

• Supports two-way conversion between the three mainstream coordinate systems, covering the needs of domestic and international map platforms.
• Utilizes industry-standard algorithms, achieving centimeter-level conversion accuracy.
• Clean and intuitive interface, ready to use immediately with no registration required.

How to Use

1. Select the original coordinate type from the source coordinate system dropdown (e.g., select WGS84 for GPS devices).
2. Select the desired coordinate type from the target coordinate system dropdown (e.g., select BD09 for Baidu Maps).
3. Paste or type the coordinates into the input box (Format: longitude,latitude or latitude,longitude).
4. Click the Convert button to get instant results.

Frequently Asked Questions (FAQ)

Q: How do I convert mobile GPS coordinates to Baidu Maps?
A: Mobile GPS uses the WGS84 coordinate system. When converting, select WGS84 as the source and BD09 as the target coordinate system.

Q: Why is there still an offset in Amap (Gaode Maps) after conversion?
A: Amap uses the GCJ02 coordinate system, and the offset after conversion is typically less than 10 meters. If the deviation is too large, please check: 1. Whether the original coordinates came from a GPS device. 2. Whether the wrong coordinate system type was selected. 3. Whether special terrain might be affecting accuracy.

Important Notes

The input format must be in decimal degrees (e.g., 116.4074, 39.9042) and supports up to 6 decimal places of precision. We do not store user data during the conversion process; however, we recommend processing highly sensitive coordinates locally. Batch processing requires API integration, and a single manual request supports up to 50 coordinate conversions.

Technical Notes & Best Practices

For map developers, we recommend adding a random offset of 0.5 to 3 meters after coordinate conversion (except outside mainland China) to avoid triggering e-commerce geofences. Typical conversion example: Converting the WGS84 coordinate (116.4074, 39.9042) to GCJ02 results in (116.4112, 39.9079). The offset is approximately 400 meters, which complies with China's geographic information security regulations.