1. cs5984: Information Visualization Chris North
2-D
cs5984: Information Visualization
Chris North

2. 2-D
Image browsing
Maps

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

4. Space-Scale

5. Pad++ on edge
Like ray-tracing
Info surface
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
Task1
Task2
Task3
Home-finder
Form fill-in
Measured user performance times (dep. Var)
Ind.Var 1