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Presented by Mei Huang & Chunyuan Liao 3/10, 2005

SpaceTree: Supporting Exploration in Large Node Link Tree, Design Evolution and Empirical Evaluation Catherine Plaisant, Jesse Grosjean, Benjamin B.Bederson in Proceedings of IEEE Symposium on Information Visualization, 2002: 57 -64, Boston, October 2002. Presented by Mei Huang & Chunyuan Liao

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Presented by Mei Huang & Chunyuan Liao 3/10, 2005

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  1. SpaceTree: Supporting Exploration in Large Node Link Tree, Design Evolution and Empirical Evaluation Catherine Plaisant, Jesse Grosjean, Benjamin B.Bedersonin Proceedings of IEEE Symposium on Information Visualization, 2002: 57 -64, Boston, October 2002 Presented by Mei Huang & Chunyuan Liao 3/10, 2005

  2. Outline • Motivation • Related work • Highlights of SpaceTree • Controlled Experiments • Comments • Discussions

  3. Motivation • Improve classic tree representation (node link diagram) by zoomable UI and animation techniques • Classic representation is the most familiar mapping of a tree • Inefficient space usage makes large tree exploration not so convenient • Zooming & animation can improve user experiences

  4. Related work (1) • Category 1 : Space filling • Representatives • Treemaps • Information slices • Comments • Focus on leaf nodes, not the tree topology • Users need training due to unfamiliarity

  5. Information Slices

  6. Related work (2) • Category 2 : Node link • Techniques • Layout : • V/H hierarchy, Circular layout (hyperbolic tree), 3D diagram • Uneven scaling : • Overview + Detail views, Zooming, Pruning, Expand & Contract • Selective rendering : • Dynamic Query • Comments • Clearer and intuitive view of tree topology • Challenge in screen space usage

  7. Highlights & Early Design lessons • Semantic zooming • Aggressive expanding • Decomposed tree animation • Landmark • Search & Filter Demo

  8. Hyperbolic Browser • Lay a whole tree out in a hyperbolic plane and map it to a unit disk • Focus & context • Smooth & continuous animation Circle Limit IV by M.C. Escher Demo John Lamping, Ramana Rao, and Peter Pirolli “A Focus+Context Technique Based on Hyperbolic Geometry for Visualizing Large Hierarchies” Processdings of the ACM SIGCHI Conference on Human Factors in Computing Systems, Denver, May 1995

  9. Comparing SpaceTree, Hyperbolic Tree Browser, MS Explorer, and Treemap

  10. Comments • A good application of zoomable UI & animation • Early version review provides very useful information • Controlled experiments were carefully designed; observation explanations were clear and sound • Screen space usage could be improved

  11. Discussions • Checking available space in both dimensions? • Alternative summarizers • Label several previously visited paths may be useful • How to deal with large node bounding box? • Combining ST with HT?

  12. Thank you !

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