This topic describes the GCJ-02 coordinate system and the GeoJSON data format used by DataV map widgets. You can obtain the GCJ-02 coordinate of a location on the map.

GCJ-02 coordinate system

DataV map widgets use the GCJ-02 coordinate system. It is developed by the Chinese National Bureau of Surveying and Mapping. GCJ-02 uses an encryption algorithm to encrypt the latitude and longitude of a location by adding random offsets to the latitude and longitude. All maps published in mainland China, including electronic maps, must use GCJ-02 for initial encryption of geographical location data.

GeoJSON data format

DataV map widgets use geographic data in the GeoJSON format.

  • GeoJSON is used to present geospatial information based on JavaScript Object Notation (JSON).
  • You can use the GeoJSON online editing tool DataV.GeoAtlas to obtain or edit geodata in the GeoJSON format.

Coordinate picker in Google Maps

Use a coordinate picker in Google Maps to convert a location to a precise GCJ-02 coordinate.

For example, enter Hangzhou, Zhejiang on the left side of the page, right-click West Lake in the map, and select What's here? to obtain the coordinate of West Lake.
Figure 1. Coordinate picker
Coordinate picker
Figure 2. Obtain the coordinate of West Lake
Obtain the coordinate of West Lake