About GeoCoordConv
GeoCoordConv is a free, open-source coordinate conversion toolbox designed for GIS developers, surveyors, and data analysts who work with Chinese coordinate systems.
Supported Coordinate Systems
WGS84
World Geodetic System 1984 — the GPS standard used globally.
GCJ02
Chinese national standard (Mars coordinates) with nonlinear offset from WGS84.
BD09
Baidu coordinate system with additional offset from GCJ02.
BD09MC
Baidu Mercator projection — planar coordinates in meters.
Features
- • All 10 conversion directions between WGS84, GCJ02, BD09, and BD09MC
- • Batch CSV processing for bulk coordinate conversion
- • AOI (Area of Interest) string to GeoJSON polygon parser
- • REST API for programmatic access
- • Sub-meter conversion accuracy
- • Open source and free to use