DataV:Map data format

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 mapping systems published by the Chinese mainland (including in electronic form) must have at least the first encryption of the geographical location by GCJ-02.

• JavaScript: conversion of the coordinate system
• JavaScript: conversion of the GeoJSON 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

You can use the coordinate picker of Google Maps to convert detailed addresses to precise coordinates based on the GCJ-02 coordinate system.

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. Google Maps coordinate picker

Figure 2. Obtain West Lake coordinates