Travel tracking of health code pays more attention to the reliability and stability of data. In addition, for the sake of data integrity, the data source of health code comes from our mobile phones to a great extent.
When we use the mobile phone, the mobile phone will constantly send out radio signals, which will be captured by the operator base station and Internet companies, and operators and Internet companies will track our journey by filtering these signals.
Under normal circumstances, the mobile phone will communicate with the nearest base station every few seconds, and the operator will know the location after communication. Naturally, I know which cities I went to.
Wechat's health code is mainly to judge whether there is a cross-city WeChat sends the user number to the operator, and the operator tells the WeChat user whether he has left the current city, thus completing the whole judgment process.
Extended data:
Color of health code:
The green code represents the health status that has been verified by the epidemic prevention data of the national government service platform. The yellow code represents the health state that the epidemic prevention data verified by the national government service platform is normal, but the on-site temperature measurement is abnormal. Red team represents the health status of confirmed and suspected cases verified by epidemic prevention data of national government service platform.
There are also purple codes in some areas, which belong to high-risk personnel, such as confirmed patients, suspected patients and asymptomatic infected people with positive nucleic acid test. The orange code belongs to close contacts or suspected contacts. There are no symptoms or abnormal records in the national database. The national system will automatically update the data for you, and the identity code will be automatically converted into a green code.