ABSTRACT: A clustered graph can be used to build an abstract view of its non-clustered counterpart and reduce visual complexity. The classic approach to interaction with a clustered graph is limited in scalability and efficacy, underlining the need for an overview diagram. We present a technique for the automatic generation of an overview diagram based on hierarchical clustering and discuss its application to graphs. Hierarchical clustering induces a tree structure that is useful as a map to navigate the original data set. Because the resulting overview diagram is itself a graph, it can be manipulated by the same tools that are available for graphs.

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Information Systems [INS]
Visualization and 3D User Interfaces

Marshall, S., Herman, I., & Melançon, G. (2000). Automatic generation of interactive overview diagrams for the navigation of large graphs. Information Systems [INS]. CWI.