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Information Visualization: Trees

Information Visualization: Trees. Chris North cs3724: HCI. Info Visualization Review. Multi-dimensional data vis Navigation strategies. Trees (Hierarchies). What is a tree? DAG, one parent per node items (can have attributes) + structure

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Information Visualization: Trees

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  1. Information Visualization:Trees Chris North cs3724: HCI

  2. Info Visualization Review • Multi-dimensional data vis • Navigation strategies

  3. Trees (Hierarchies) • What is a tree? • DAG, one parent per node • items (can have attributes) + structure • Data structure: parent ptr, array of children, LM child+RS • Size: #nodes = bheight • ResultSet -> Tree? • categorical • Parent ptr • Path name

  4. Examples • Example trees: • book libraries, folders, family trees, threaded msgs • NCAA march madness!!!! • Aisles, websites, org charts • Tasks: • search, drill down, browsings • Structural analysis, parents, children, • Least common ancestor

  5. 2 Approaches • Connection • node & link • E.g. TreeView widget • Containment • node in node • E.g. Venn diagram A B C A B C

  6. Detail Only • Dos: tree • Whats the problem?

  7. TreeView Widget • Good for directed search tasks • Good for text labeled nodes • Not good for learning structure • No attributes • Apx 50 items visible • Lose path to root for deep nodes • Scroll bar! • Error rate high • Fitt’s Law? • Too many small distant things

  8. Mac Finder

  9. Overview+Detail • Maryland

  10. Focus+Context • Hyperbolic Tree (star tree) • Radial; shrink with distance to center • Drag to navigate • Scalability? • Xerox PARC, Inxight • http://startree.inxight.com/

  11. Miniaturization • Disk Tree • Xerox PARC

  12. 3D • ConeTrees • Rotate subtrees • Pro: • Con: • Xerox PARC

  13. Ugh!

  14. 2 Approaches • Connection • node & link • E.g. TreeView widget • Containment • node in node • E.g. Venn diagram A B C A B C

  15. Zooming • TreeMaps • Slice and Dice, space filling • Node size & color encodes data attribute • Zoom on subtrees • Good for fixed-height trees • Scalability? • Maryland • http://www.cs.umd.edu/hcil/treemap3/

  16. “Squarified” TreeMap • http://www.research.microsoft.com/~masmith/all_map.jpg

  17. Cushion TreeMaps • Cushion TreeMaps • Free file directory browser • Van Wijk • http://www.win.tue.nl/sequoiaview/ • Map of the Market • http://www.smartmoney.com/marketmap/

  18. Radial Containment • SunBurst • Radial slicing • Animated zooming • Focus+Context • Georgia Tech

  19. Sunburst vs. Treemap • + Faster learning time: like pie chart • + Details outward, instead of inward • + Focus+context zooming • - Not space filling • - More space used by non-leaves • All leaves on 1-D space, perimeter • Treemap: 2-D space for leaves • - Smaller scalability?

  20. Multiple Foci? • Focus on 2 distant regions simultaneously • Microsoft Research

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