Information Visualization Navigation Chris North cs 3724 HCI

Information Visualization: Navigation Chris North cs 3724: HCI

Review • Shneiderman’s Info. Vis. mantra? • • Strategies for Multi-D visualization: •

1 -D and 2 -D Spaces • 1 -D: info has strong 1 -D organization • text doc, slideshows, video, audio, lists, timelines • 2 -D: info has strong 2 -D organization • spreadsheets, graphs, maps, formatted docs, color chooser, images

Power. Point Slide Sorter • Data Space: 1 D array of slides • Visualization: 2 D array, nav 1 D

Typical Navigation 1 D scrollbar 2 D scrollbars What’s missing?

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

Text Overviews (MS Word)

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, satisfaction Insight

Navigation Strategies • Detail Only • Zooming • Overview+Detail • Focus+Context • Multiple views • Distortion, fisheye

Zooming: 1 D • Lifelines: http: //www. cs. umd. edu/hcil/lifelines/

Zooming large 2 D spaces • http: //terraserver. homeadvisor. msn. com/image. asp? S=10&T=1&X=2689&Y=20639&Z=17&W=2

Zooming: 2 D • Kid. Pad, Hi. Note, Jazz • 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?

Overview+Detail: 1 D • See. Soft

Overview+Detail: 1 D • Home automation: • Timeline for scheduling, set on/off flags • Calendar shows overview of schedule

Overview+Detail: 2 D Overview: Detail: Square in overview tightly-coupled to scroll bars of detail • Zoom factor = 5

Overview+Detail • Multiple views: • overview • detail view • Views are linked: • Selector in overview navigates detail • Navigating detail updates selector in overview

Multiple levels = large scale overview intermediate view • Zoom factor = 125 intermediate view detail view

Multiple Foci Linkit

Focus+Context: 1 D • Fisheye Menu: http: //www. cs. umd. edu/hcil/fisheyemenu/ • Perspective Wall

Focus+Context: 2 D

Comparison • Zooming: • natural • Infinite scalability • Lose overview when zoom in • Overview+Detail: • Good scalability, chaining • Multiple foci • Disconnect between views, back-n-forth • Focus+Context: • Integrated overview with detail, connected • Least scalable • Distortion, overview unstable

Quiz • Spotfire? • Table. Lens?