How to identify space-time capture

Space-time intersection means that my phone number and confirmed number stay together for more than 10 minute in the same space-time grid with the range of 800M×800M, and the cumulative stay time of any number exceeds 30 hours in the last 14 days.

What do you mean by crossing time and space? According to reports, "time-space intersection" is a technical term used by the public security and telecommunications departments. Space-time intersection and space-time accompaniment are the same concept, which means staying in the same space-time grid (800 m× 800 m) with the diagnosed patient within 14 days 10 minutes. In layman's terms, it is crossed with the travel trajectory of the confirmed patient 14 days. No matter whether the communication signal drifts or passes by, it may be considered as a time-space intersection crowd.

What do you mean by crossing time and space? According to reports, "time-space intersection" is a technical term used by the public security and telecommunications departments. Space-time intersection and space-time accompaniment are the same concept, which means staying in the same space-time grid (800 m× 800 m) with the diagnosed patient within 14 days 10 minutes. In layman's terms, it is crossed with the travel trajectory of the confirmed patient 14 days. No matter whether the communication signal drifts or passes by, it may be considered as a time-space intersection crowd. What do you mean by "secret connection" and "sub-secret connection"? "A, B, C, D can make an analogy. If A is a confirmed case, B and A live, work and eat together, which belongs to close contact. C and B have a similar relationship, that is, close contact, and then C is the second close contact. D has crossed with A and B, but it is not in close contact. " In epidemiological investigation, sub-close contacts mainly investigate close contacts of close contacts, that is, people who have had close contact with close contacts, such as living together, working in the same closed environment, having dinner and entertainment, but from the first contact between close contacts and cases or asymptomatic infected people (two days before onset) to the time when close contacts are isolated and managed without effective protection. The focus of the survey is the family members, colleagues and other people who are in close contact.