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SpaceTree

SpaceTree is an advanced interactive visualization tool for traditional node-link tree diagrams. It offers dynamic rescaling of branches to optimize screen space, preview icons summarizing hidden branches, smooth animations, and integrated search functions. A user study showed high subjective preference for SpaceTree over alternatives, highlighting its efficiency and ease of use. Key findings emphasized the benefits of preview icons and consistent layout in improving node-link tree browsing experience. Developed by Jesse Grosjean, Catherine Plaisant, and Ben Bederson at the University of Maryland's Human-Computer Interaction Laboratory. For more information, visit www.cs.umd.edu/hcil/spacetree/.

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SpaceTree

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  1. SpaceTree An Interactive Visualization of Traditional Node-Link Tree Diagrams Jesse Grosjean Catherine Plaisant Ben Bederson Human-Computer Interaction Laboratory University of Maryland

  2. Node Link Tree Diagrams Eastern Region Manager Operations Manager • Familiar representation • Shows tree topology well • BUT: Inefficient use of screen space Western Region Manager Facilities Engineer Big Oil President Drilling Manager North Region Manager Land Manager Safety Manager HR Manager Support Functions IT Manager

  3. SpaceTree • Dynamic rescaling of branches to best fit available screen space based on focus. • Preview icons to summarize the topology of hidden branches • Smooth animation between views • Integrated search and filter functions

  4. Alternative Preview Icons

  5. User Study • 18 subjects, all used the 3 interfaces • Order and task set counterbalanced • 40 minute session • SpaceTree MS Explorer Hyperbolic tree browser

  6. Subjective Preference: Attractiveness Attractiveness (1=not cool at all, 9=very cool) 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 SpaceTree Explorer Hyperbolic No significant difference between Hyperbolic and SpaceTree

  7. Preference for Future Use Use (1=would not like to use, 9=very much like to use) 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 Explorer Hyperbolic SpaceTree No significant difference

  8. Time to Return to Previously Visited Node 25.00 20.00 15.00 Time is sec. 10.00 5.00 0.00 Explorer Hyperbolic SpaceTree SpaceTree sign. faster than Hyperbolic, Explorer fastest

  9. Estimating Size of Subtrees Example: comparing 3 subtrees of 60, 300 and 160 nodes (SpaceTree also faster)

  10. Estimating Size of Subtrees Example: comparing 3 subtrees of 60, 300 and 160 nodes (SpaceTree also faster)

  11. Conclusions • Preview icons and consistent layout improve node-link tree browsers • Task analysis will help you chose the right browser www.cs.umd.edu/hcil/spacetree/ • Partial support from Chevron-Texaco • Participation of Jean-Daniel Fekete and Ben Shneiderman at HCIL, Cheryl Lukehart and Don Schiro at Chevron-Texaco.

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