Figure 1From: Spatio-temporal techniques for user identification by means of GPS mobility data Trajectory-based identification. Two traces \(M_{1}\) (grey) and \(M_{2}\) (black) along with a set of three points (red) sampled from \(M_{2}\). These points are classified as belonging to \(M_{2}\) because the average distance to the corresponding nearest points in \(M_{2}\) is lower than the average distance to the nearest points in \(M_{1}\).Back to article page