From Topic Networks to Distributed Cognitive Maps: Zipfian Topic Universes in the Area of Volunteered Geographic Information

Figure 11

Schematic depiction of informational sources explored to link topics (red vertices) in a 3-level topic network as a function of the textual relatedness of texts (blue vertices) (belonging to layer of Definition 1), the social relatedness of corresponding authors (green vertices) (belonging to layer of Definition 1), and the lexical relatedness of corresponding words (orange vertices) (belonging to layer of Definition 1). In this scenario, thematic relatedness is the information to be inferred, while textual, lexical, and social relations concern given information or evidence. Bidirectional red arcs denote arcs of corresponding margin layers of Definition 1.