Angular Treemaps

Cambridge Scholars Publishing
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Information Visualisation Techniques, Usability and Evaluation, 2014, pp. 83 - 107
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Space-filling visualization techniques have proved their capability in visualizing large hierarchically structured data. However, most existing techniques restrict their partitioning process in vertical and horizontal directions only, which causes problems with identifying hierarchical structures. This chapter presents a new space-filling method named Angular Treemaps that relaxes the constraint of the rectangular subdivision. The approach of Angular Treemaps uses the divide and conquer paradigm to visualize and emphasize large hierarchical structures within a compact and limited display area with better interpretability. Angular Treemaps generate various layouts to highlight hierarchical substructure based on user’s preferences or system recommendations. It offers flexibility to be adopted into a wider range of applications, regarding different enclosing shapes. Preliminary usability results suggest user’s performance is improved by using this technique in locating and identifying categorized analysis tasks.
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