Figure 3
From: Spatio-temporal techniques for user identification by means of GPS mobility data
Average uniqueness of spatial information. For each dataset, we measure the average uniqueness of the users’ location information (y-axis) as we vary the number of data points (x-axis). We consider the GPS location information at different levels of decimal resolution: 1 digit (red), 2 digits (blue), 3 digits (green), 4 digits (magenta) and 5 digits (black). Decreasing the decimal place resolution of the GPS coordinates generally leads to a lower average uniqueness, suggesting that spatial coarsening can help to obfuscate the identity of mobility data users.