Fig. 7

Crowd map and its abstract version. a Crowd map from Citysense project (http://www.sensysmag.com/spatialsustain/citysense-app-aims-to-connect-tribes.html) of size roughly 3.6 by 4.2 km; red regions are where the crowds are. b Abstracted discretized view of crowd map with \(\alpha = 0.1968039468039468\), with 126 × 148 regions, each region corresponding to roughly 28.5 × 28.5m; ‘1’s (or lighter regions) representing regions with crowds