Fig. 7From: Open source data mining infrastructure for exploring and analysing OpenStreetMapVisualization technique for the documentation of the folksonomy in the OSM wiki. The nodes of the inner circle refer to the documented keys, while the nodes around, to the corresponding values. The longer a value exists, the more it moves away from the origin. Data from the OSM wiki â’¸ OpenStreetMap contributors (cf. http://wiki.openstreetmap.org/wiki/Wiki_content_license). Image and caption by Mocnik et al. [8], CC BY 4.0. a 2007 b 2012Back to article page