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Achieve high-precision conversions between lat/long, addresses, and WGS84/GCJ02/BD09 coordinate systems to fix map location offsets.
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When WGS84 coordinates obtained by GPS devices show offsets on Chinese maps, this tool uses professional algorithms to achieve high-precision conversions between different coordinate systems. The coordinate converter processes geolocation data (latitude/longitude coordinates or text addresses) and outputs coordinates in the target system or performs reverse geocoding. Its core capabilities include: converting location coordinates of any point on the Earth's surface (represented in degrees, minutes, seconds or decimal degrees) between the three major coordinate systems: WGS84 (international standard), GCJ02 (China official encrypted), and BD09 (Baidu encrypted), as well as supporting geocoding and reverse geocoding.
Q: Why do mobile GPS coordinates show deviations on Amap (Gaode)?
A: The direct cause is a coordinate system mismatch. Mobile GPS uses WGS84 coordinates, while Amap uses the GCJ02 coordinate system. You need to convert them using this tool.
Q: What is the accuracy difference range when converting between BD09 and GCJ02?
A: The Baidu coordinate system (BD09) is encrypted a second time based on GCJ02, and the conversion error is usually ≤ 1 meter. However, in remote areas, due to different encryption parameters, the maximum error may reach 3-5 meters.
• Geocoding requires complete administrative division information (e.g., "No. 27 Zhongguancun Street, Haidian District, Beijing").
• Coordinate system conversion does not apply to elevation data; it only processes planar coordinates.
• Please do not upload sensitive location coordinates. Our service does not save user data.
• The maximum limit for a single processing is 50 entries. Batch file conversion is not supported.
When developing GIS systems, it is recommended to unify the base coordinate system first. For example, convert WGS84 coordinates collected by drones to GCJ02 before integrating them into the Amap API. A typical conversion example: WGS84 coordinates (116.397456, 39.907761) → GCJ02 coordinates (116.403119, 39.914525). The offset is about 700 meters, which matches the encryption parameter characteristics of the Beijing area.
