In as long as mation Visualization: Principles, Promise, in addition to Pragmatics Marti Hearst CHI

In as long as mation Visualization: Principles, Promise, in addition to Pragmatics Marti Hearst CHI www.phwiki.com

In as long as mation Visualization: Principles, Promise, in addition to Pragmatics Marti Hearst CHI

Hawley, Chris, Mexico City Reporter has reference to this Academic Journal, PHwiki organized this Journal In as long as mation Visualization: Principles, Promise, in addition to Pragmatics Marti Hearst CHI 2003 Tutorial Agenda Introduction Visual Principles What Works Visualization in Analysis & Problem Solving Visualizing Documents & Search Comparing Visualization Techniques Design Exercise Wrap-Up Introduction Goals of In as long as mation Visualization Case Study: The Journey of the TreeMap Key Questions

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What is In as long as mation Visualization Visualize: to as long as m a mental image or vision of Visualize: to imagine or remember as if actually seeing. American Heritage dictionary, Concise Ox as long as d dictionary What is In as long as mation Visualization “Trans as long as mation of the symbolic into the geometric” (McCormick et al., 1987) “ finding the artificial memory that best supports our natural means of perception.” (Bertin, 1983) The depiction of in as long as mation using spatial or graphical representations, to facilitate comparison, pattern recognition, change detection, in addition to other cognitive skills by making use of the visual system. In as long as mation Visualization Problem: HUGE Datasets: How to underst in addition to them Solution Take better advantage of human perceptual system Convert in as long as mation into a graphical representation. Issues How to convert abstract in as long as mation into graphical as long as m Do visualizations do a better job than other methods

Visualization Success Stories The Power of Visualization 1. Start out going Southwest on ELLSWORTH AVE Towards BROADWAY by turning right. 2: Turn RIGHT onto BROADWAY. 3. Turn RIGHT onto QUINCY ST. 4. Turn LEFT onto CAMBRIDGE ST. 5. Turn SLIGHT RIGHT onto MASSACHUSETTS AVE. 6. Turn RIGHT onto RUSSELL ST. The Power of Visualization Line drawing tool by Maneesh Agrawala http://graphics.stan as long as d.edu/~maneesh/

Visualization Success Story Mystery: what is causing a cholera epidemic in London in 1854 Visualization Success Story From Visual Explanations by Edward Tufte, Graphics Press, 1997 Illustration of John Snow’s deduction that a cholera epidemic was caused by a bad water pump, circa 1854. Horizontal lines indicate location of deaths. Visualization Success Story From Visual Explanations by Edward Tufte, Graphics Press, 1997 Illustration of John Snow’s deduction that a cholera epidemic was caused by a bad water pump, circa 1854. Horizontal lines indicate location of deaths.

Purposes of In as long as mation Visualization To help: Explore Calculate Communicate Decorate Two Different Primary Goals: Two Different Types of Viz Explore/Calculate Analyze Reason about In as long as mation Communicate Explain Make Decisions Reason about In as long as mation Goals of In as long as mation Visualization More specifically, visualization should: Make large datasets coherent (Present huge amounts of in as long as mation compactly) Present in as long as mation from various viewpoints Present in as long as mation at several levels of detail (from overviews to fine structure) Support visual comparisons Tell stories about the data

Why Visualization Use the eye as long as pattern recognition; people are good at scanning recognizing remembering images Graphical elements facilitate comparisons via length shape orientation texture Animation shows changes across time Color helps make distinctions Aesthetics make the process appealing A Key Question How do we Convert abstract in as long as mation into a visual representation While still preserving the underlying meaning And at the same time providing new insight The Need as long as Critical Analysis We see many creative ideas, but they often fail in practice The hard part: how to apply it judiciously Inventors usually do not accurately predict how their invention will be used This tutorial will emphasize Getting past the coolness factor Examining usability studies

Case Study: The Journey of the TreeMap The TreeMap (Johnson & Shneiderman ‘91) Idea: Show a hierarchy as a 2D layout Fill up the space with rectangles representing objects Size on screen indicates relative size of underlying objects. Early Treemap Applied to File System Treemap Problems Too disorderly What does adjacency mean Aspect ratios uncontrolled leads to lots of skinny boxes that clutter Color not used appropriately In fact, is meaningless here Wrong application Don’t need all this to just see the largest files in the OS

Successful Application of Treemaps Think more about the use Break into meaningful groups Fix these into a useful aspect ratio Use visual properties properly Use color to distinguish meaningfully Use only two colors: Can then distinguish one thing from another When exact numbers aren’t very important Provide excellent interactivity Access to the real data Makes it into a useful tool TreeMaps in Action http://www.smartmoney.com/maps http://www.peets.com/tast/11/coffee-selector.asp A Good Use of TreeMaps in addition to Interactivity www.smartmoney.com/marketmap

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Treemaps in Peets site Analysis vs. Communication MarketMap’s use of TreeMaps allows as long as sophisticated analysis Peets’ use of TreeMaps is more as long as presentation in addition to communication This is a key contrast Open Issues Does visualization help The jury is still out Still supplemental at best as long as text collections A correlation with spatial ability Learning effects: with practice ability on visual display begins to equal that of text Does visualization sell Jury is still out on this one too! This is a hot area! More ideas will appear!

Key Questions to Ask about a Viz What does it teach/show/elucidate What is the key contribution What are some compelling, useful examples Could it have been done more simply Have there been usability studies done What do they show What we are not covering Scientific visualization Statistics Cartography (maps) Education Games Computer graphics in general Computational geometry Agenda Introduction Visual Principles What Works Visualization in Analysis & Problem Solving Visualizing Documents & Search Comparing Visualization Techniques Design Exercise Wrap-Up

For more in as long as mation My course: http://www.sims.berkeley.edu/courses/is247/s02/Lectures.html Atlas of Cyberspaces: http://www.geog.ucl.ac.uk/casa/martin/atlas/atlas.html Gallery of Data Visualization; The Best in addition to Worst of Statistical Graphics http://www.math.yorku.ca/SCS/Gallery/ Tamara Munzner’s collection: http://graphics.stan as long as d.edu/courses/cs348c-96-fall/resources.html Thank you!

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