On March 7, 2020, the first batch of people who have to return to work in Hubei Province have received the green code through the "Hubei Office" APP and Alipay. The headquarters of the county (city, district) where the personnel who need to return to work now live can inquire about the health status of the relevant personnel through the big data platform and issue the health certificate that has been isolated for 14 days.
Main factors affecting the color of health code:
First, the spatial dimension, according to the national epidemic risk, big data companies in Hangzhou can accurately go to towns (streets) according to relevant data;
The second is the time dimension, that is, the number of times someone has been to an epidemic area and the length of stay;
Third, the interpersonal dimension, that is, the contact state with close contacts, and then quantify the score.