Fig. 4From: Open source data mining infrastructure for exploring and analysing OpenStreetMapCalendar heat map with temporally arranged cells. Yellow colour indicates a low number of nodes/users per day, blue colour indicates a high number. In case no data were available for a day, the cell is left white. Data from OSMStats â’¸ OpenStreetMap contributors (cf. www.openstreetmap.org/copyright). a New nodes per day b New users per dayBack to article page