Figure 1

Mobility trace lengths \(\pmb{n_{t}}\) and inter-observation time counts between origin-destination city pairs. In Panel A, we show the logarithmically binned distribution of the number of data points in the users’ CDR-based mobility traces. The distribution shows that most two-week mobility trajectories have between 10¹ and 10³ data points. In Panel B, we show the complementary cumulative distribution (1-CDF) of the number of inter-observation counts for all origin-destination city pairs. Note that a large number of city pairs (∼10%) have zero inter-observation times, which is partially due to some cities not being allocated to any (constantly) active cell tower.