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2-D

2-D. cs5984: Information Visualization Chris North. 2-D. Image browsing Maps. Today. Bederson, “Pad++”, p 530 dilshad, satya Furnas, “Space-Scale Diagrams”, web. Space-Scale. Pad++ on edge. Info surface. Like ray-tracing. zoom. window. Semantic Zooming.

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2-D

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  1. 2-D cs5984: Information Visualization Chris North

  2. 2-D • Image browsing • Maps

  3. Today • Bederson, “Pad++”, p 530 • dilshad, satya • Furnas, “Space-Scale Diagrams”, web

  4. Space-Scale

  5. Pad++ on edge Info surface • Like ray-tracing zoom window

  6. Semantic Zooming • Zooming in, red object turns to blue

  7. Multiple Views • Zoom factor ~ 20

  8. Multiple levels = large scale • Zoom factor = 20 * 20 * 20 = 8000

  9. Multiple Foci

  10. Multiple Overviews • Can have different information types at each level

  11. 2-D + Attributes • Dynamaps: dynamic queries on maps

  12. Assignment • Read for Tues (2-D: Focus+Context) • Robertson, “Document Lens”, p 562 • ashwini, aejaaz • Spence, “Bifocal Lens”, p 331,333 • Read for Thurs (Visual Overview Strategies) • Stasko, “Information Mural”, web • sanjini, luhui • Project Proposal due Tues!

  13. Evaluation • Principled, algorithmic • Usability • Empirical user studies ** • Compare multiple visualizations • Independent variables: • Visualization, User task, Data size, … • Dependent variables: • 5 HCI metrics

  14. e.g. 2 x 3 design • n users per cell • Statistics to test for “significant” difference: t-tests, anova Ind.Var 2 Measured user performance times (dep. Var) Ind.Var 1

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