What did the big data survey pass?

Big data screening is generally based on mobile phone signals, not ID card registration. At present, there are three main ways to troubleshoot big data:

The first method is to track the mobile phone number of the epidemic area for more than 10 minutes according to the mobile phone signal, which is also the most commonly used investigation method and has high authenticity and accuracy.

The second is through social information, such as nearby communities and market contacts. , mainly through telephone surveys, groping visits and other ways to draw conclusions.

The third way is to quickly check the people who may be infected through the confirmation of the item information, such as the items that the confirmed case has contacted, the people who may have contacted after circulation, and other items that may be contaminated by the source of infection.