1. Information Visualization: Navigation
Chris North
cs3724: HCI

2. Presentations
pat kennedy
james walker
Vote: UI Hall of Fame/Shame?

3. Next Mar 21: Proj 2, initial implementation
Apr 4: Proj 2, final implementation
Presentations: UI critique or HW2 results
Thurs: dan kirkpatrick, jason barnett
Next Tues: brian ward, juan vera
Next Thurs: dan constantin, grant underwood

4. Review Shneiderman’s Info Vis. mantra?
overview first, zoom&filter, details on demand
Strategies for Multi-D visualization:
tablelens
Spotfire: scatterplots, dynamic queries
Parallel coordinates

5. 1D and 2D Spaces 1D: info has strong 1D organization
timeline, reststops on highway
Tape measure
text
2D: info has strong 2D organization
maps
Tables?
Pictures, photos

6. Examples 1D: Project 1, VCR Timeline for scheduling, set on/off flags
Calendar shows overview of schedule

7. PowerPoint Slide Sorter
Data Space: 1D array of slides
Visualization: 2D array, nav 1d

8. Typical Navigation
1D scrollbar 2D scrollbars

9. Keyhole Problem Where am I? Where can I go? Where do I want to go?
How do I get there?
Lack of context, overview

10. Visual Overview Show me the data!
Map, organization (spatial layout of concepts)
What information is (not) available?
Adds context info, relationships
Enables direct access
Encourages exploration
HCI metrics:
Improves user performance, learning time, error rates, retention, satisfaction
Insight

11. Navigation Strategies
Detail Only
Zooming
Overview+Detail
Focus+Context (Distortion, fisheye)
Keyhole problem

12. Zooming: 1D

13. Zooming: 2D http://www.cs.umd.edu/hcil/jazz/ Semantic zooming:
Don’t just show things at different size
change objects to make sense
E.g. add/remove detail info
Powers of Ten
Controls?

14. Zooming large 2D spaces

15. Overview+Detail: 1D
SeeSoft

16. Overview+Detail: 2D Overview: Detail: Zoom factor = 5
Square in overview coupled to scroll bars of detail

17. Overview+Detail Simultaneous overview and detail view
Views are linked:
Selector in overview navigates detail
Navigating detail updates selector in overview

18. Multiple levels = large scale
overview
intermediate view
intermediate view
detail view
Zoom factor = 5*5*5 = 125

19. Multiple Foci

20. Focus+Context: 1D

21. Focus+Context: 2D

22. Comparison Zooming: O+D: F+C Scales best Simple Lose context, get lost
Screen space
O+D:
Keeps context
Limited scale
Direct access
F+C
Multiple foci
Distortion disorienting
Implementation difficult