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Visualising Multiple Overlapping Classification Hierarchies
Martin Graham
Faculty of Engineering and Computing - Napier University
Project Description:
Acknowledging that most of the efforts of tree structure visualization concentrate on visualising the structure and properties of just a single tree, Martin Graham's PhD premise was to develop a metaphor that allows users to explore the relations and properties of and across multiple tree structures.

With that in mind, from 2000 onward, Martin Graham and his colleagues developed a series of graph visualizations of overlapping taxonomic data. Overlapping hierarchies could be switched on/off with colour indicating relationships in a particular hierarchy. Eventually they moved to a multiple tree format as a preferred visualisation after feedback from users.

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