2-D cs5984: Information Visualization Chris North
Powers of 10
Quiz • What is the “keyhole problem”? • 4 strategies to solve the keyhole problem for 1D? • f+c • Detail only • Zoom • O+d
Information Types • Multi-dimensional: databases,… • 1D: timelines,… • 2D: maps,… • 3D: volumes,… • Hierarchies/Trees: directories,… • Networks/Graphs: web,… • Document collections: digital libraries,…
2-D • Image browsing • Maps • Photos • 2d funcs • A powerpiont slide
2-D: large spaces • http://terraserver.homeadvisor.msn.com/image.asp?S=10&T=1&X=2689&Y=20639&Z=17&W=2
Tasks? • Search for target • Patterns • Distance • Aesthetics • Routefinding
Detail Only • Typical image browserMS PhotoEditor • Typical map browsermapquest.com
Zooming: Pad++ • Infinitely zoomable surface (Bederson et al.) • Layout information in 2d+scale • Interaction: pan+zoom • Need more info?Just zoom in! • Jazz
Pad++ examples • Authored spaces (user specified layouts) • E.g: filesystem replacement?, presentations, stories • HiNote, Kidpad • http://www.cs.umd.edu/hcil/jazz/play/ • http://vtopus.cs.vt.edu/~north/infoviz/hinoteapplet.html • Counterpoint: powerpoint with zooming • http://www.cs.umd.edu/hcil/counterpoint/
Pad++ examples • Automated layouts • E.g: File system,web history
Pad++ examples • In visualization
Space-Scale
Pad++ on edge Info surface • Like ray-tracing zoom window
Semantic Zooming • Zooming in, red object turns to blue label label
Good/Bad • Good: • “step back” to get overview • “step forward” for more details • Infinite space for more details • Visual scale conceptual scale • Bad: • get lost because of no overview • Need work on input device
Overview+Detail Overview: Detail: • Zoom factor = 6 Square in overview coupled to scroll bars of detail
Multiple levels = large scale overview intermediate view • Zoom factor = 10*10*10=1000 intermediate view detail view
Multiple Foci
Multiple Overviews • Can have different data types in each view Color slice CaT scan
O+D vs Detail-Only • Beard & Walker: 2D • Chimera: trees • North: 1D (lists) • Scrollbars are bad!
Intermediate views? • Plaisant, “When an Intermediate view matters” • abhi, sandeep Overview ? Detail view
Translucency • Lieberman, “Macroscope: Powers of Ten Thousand” • anusha, mrinmayee
2-D + Attributes • Dynamaps: dynamic queries on maps
Assignment • Thurs: 2-D, focus+context • Robertson, “Document Lens” • priya, parool • Leung, “Bifocal displays” • alex, qiang • Homework #2 due thurs
Next Week • tues: Visual Overview Strategies • Stasko, “Information Mural” • ben, ahmed • Rayson, “Aggregate Towers” • anil, supriya • thurs: Multiple View Strategies • Chi, “Visualization Spreadsheet” • mudita, abhi • North, “Snap-Together Visualization” • varun, kumarl
