Figure 4
From: Spatio-temporal techniques for user identification by means of GPS mobility data
Effect of the number of users on the average uniqueness. We measure the average uniqueness of the users’ traces (y-axis) as we vary the number of users in the datasets (x-axis). Moreover, we show how the average uniqueness varies as we change the number of spatial points considered. Note that as the number of users increases more uncertainty is added to the identity information. However, we observe that in the CabSpotting dataset the number of spatial points plays a pivotal role in the determination of the level of uniqueness.