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Graph Visualization

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  1. Graph Visualization cs5764: Information Visualization Chris North

  2. Where are we? Multi-D 1D 2D 3D Trees Graphs Document collections Design Principles Empirical Evaluation Visual Overviews

  3. Networks • Graph = nodes + edges • Nodes and edges have attributes • Tabular storage: 1 table for nodes, 1 table for edges • Examples: • Web, roads, telephone, internet, cpu architecture, travel, document citations • Tasks: • shortest path, all paths • neighbors, degree • topology, connected components, sub-graphs • Web domain: broken links, navigation, update, sitemap, orientation

  4. Visualization Approaches • Connections (nodes & links) • Nodes: • Size, color, shape, location, label, … • Links: • Direction, width, color, shape, label, … • Other approaches? • adjacency matrix, containment, … A C A B

  5. Yuk

  6. Challenges • Graph layout • Scale • Navigation • Problem: Bowl of spaghetti!

  7. Graph Layout Styles • Straight line • Arc • Orthogonal

  8. Aesthetic constraints • Minimize link crossings • Minimize link lengths • Minimize link bends • Maximize symmetries • …

  9. Not Trivial

  10. Common Layout Algorithms • Circular • Concentric • Layering • Force directed • Clustering • Hierarchical clustering • Convert to tree • Geographic, pre-determined

  11. Circular Layout

  12. Radial Layout • http://bailando.sims.berkeley.edu/infovis.html

  13. Force directed layout • Springs, gravity, clustering • http://java.sun.com/applets/jdk/1.2/demo/applets/GraphLayout/example1.html

  14. Tree Layout • WebSphinx • http://www-2.cs.cmu.edu/~rcm/websphinx/workbench.html

  15. Hyperbolic Layout • Munzner, “H3”

  16. Attribute Value Layout • Eick, “SeeNet”

  17. Scale up

  18. Multi-Digraphs • Korn, “Multi-Digraphs”

  19. Adjacency Matrix Connex by PNNL

  20. Hierarchical Aggregation • by Feiner • 1. Cluster

  21. Hierarchical Aggregation • 2. Group hierarchically

  22. Hierarchical Aggregation • 3. Link inheritance

  23. SHriMP • Storey, “SHriMP”

  24. ThinkMap – Visual Thesaurus • http://www.visualthesaurus.com • Show only depth 1 from focus node

  25. Harmony Web Browser • by Keith Andrews • Show limited depth from focus node

  26. Harmony Web Landscape • 3D

  27. StarLight • http://www.pnl.gov/infoviz/technologies.html#starlight • PNL

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