GMap is an algorithm for visualizing graphs as maps. GMap (see also GvMap Algorithm), is a practical tool for visualizing relational data with geographic-like maps. It aims to capture the underlying structural information, clustering, and neighborhoods of complex data - pdf 
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An interactive visualization of topics from 2 million Computer Science papers, taken from the DBLP database - arizona.edu
The effectiveness of GMap is illustrated with examples from several domains, namely TV shows, Amazon books, and last.fm music - arizona.edu
See also: Drawing Graphs as Maps, and GvMap Algorithm and Scratch