2-D

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2-D

• cs5984 Information Visualization
• Chris North

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2-D

• Image browsing
• Maps

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Today

• Bederson, Pad, p 530
• dilshad, satya
• Furnas, Space-Scale Diagrams, web

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Space-Scale
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Pad on edge
Info surface

• Like ray-tracing

zoom
window
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Semantic Zooming

• Zooming in, red object turns to blue

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Multiple Views

• Zoom factor 20

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Multiple levels large scale

• Zoom factor 20 20 20 8000

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Multiple Foci
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Multiple Overviews

• Can have different information types at each level

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2-D Attributes

• Dynamaps dynamic queries on maps

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Assignment

• Read for Tues (2-D FocusContext)
• 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!

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Evaluation

• Principled, algorithmic
• Usability
• Empirical user studies
• Compare multiple visualizations
• Independent variables
• Visualization, User task, Data size,
• Dependent variables
• 5 HCI metrics

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e.g. 2 x 3 design

• n users per cell
• Statistics to test for significant difference
  t-tests, anova

Ind.Var 2
Task1 Task2 Task3
Home-finder
Form fill-in
Measured user performance times (dep. Var)
Ind.Var 1