Digital contact tracing and network theory to stop the spread of COVID-19 using big-data on human mobility geolocalization
Fig 2
(A) Contact area used in the contact tracing model. The grey person is at the first datapoint of the source at t0. We collect all datapoints for every user in a T = 30 min forward window (t1, t2, t3, …, t0 + T) within an 8 m circle from the initial position. For each target (green and red) we compute the average position and the time spent inside the contact area (red part of the trajectory line). (B) Partial transmission tree of outbreak of confirmed SARS-CoV-2 infection identified by contact tracing during calibration in the month of March 2020. Links goes from the source of infection to the target. The colors represent the day of first symptoms for each node and size is the out-degree.