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Lecture 08: Visualization Intro. September 30 , 2010 COMP 150-12 Topics in Visual Analytics. Lecture Outline. What is Visualization? Number Representations What is its value? Story telling or data exploration? Connecting data to visualization Bertin’s visual symbols What’s missing ?

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lecture 08 visualization intro

Lecture 08:Visualization Intro

September 30, 2010

COMP 150-12Topics in Visual Analytics

lecture outline
Lecture Outline
  • What is Visualization?
    • Number Representations
  • What is its value?
    • Story telling or data exploration?
  • Connecting data to visualization
    • Bertin’s visual symbols
    • What’s missing?
  • Appropriateness?
    • Representation appropriateness
    • Biases
define visualization
Define Visualization
  • Define visualization!
examples of visualization
Examples of Visualization

http://www.google.com/images?q=visualization

is this a visualization
Is This a Visualization?

15,000 BC. Laxcaux, France

what about this
What about this?

Hello World!

define visualization1
Define Visualization
  • “The communication of information using graphical representations”
    • Interactive Data Visualization (2009). Ward, Grinstein, Keim
  • “An external artifact supporting decision making”
      • Information Visualization (2004). Ware
  • “The use of computer-supported, interactive, visual representation of data to amplify cognition”
    • Readings in Information Visualization (1999). Card, Mackinlay, Shneiderman
value of visualization
Value of Visualization

Possible Values of Visualization?

value of visualization1
Value of Visualization
  • Story telling and/or data exploration?
value of visualization2
Value of Visualization
  • Story telling and/or data exploration?

Courtesy of Tableau

value of visualization3
Value of Visualization

What do you think?

value of visualization4
Value of Visualization
  • Reduce Memory Load
    • Working memory is limited
    • Store information in the diagram
  • Reduce Search Time
    • Pre-attentive (constant-time) search process
    • Spatially-indexed patterns store the “facts”
  • Allow Perceptual Inference
    • Map inference to pattern finding
number representations
Number Representations
  • Zhang and Norman (1995). The Representation Of Numbers. Cognition.
example arithmetic
Example: Arithmetic

Slide courtesy of Pat Hanrahan

example arithmetic1
Example: Arithmetic

Slide courtesy of Pat Hanrahan

example arithmetic3
Example: Arithmetic

Slide courtesy of Pat Hanrahan

distributed cognition
Distributed Cognition
  • Distributed cognition is a psychological theory that involves the coordination between individuals, artifacts and the environment. It has several key components:
    • Embodiment of information that is embedded in representations of interaction
    • Coordination of enaction among embodied agents
    • Ecological contributions to a cognitive ecosystem

Courtesy of Wiki

additional thoughts
Additional Thoughts?

Slide courtesy of Pat Hanrahan

connecting data to visualization
Connecting Data To Visualization
  • Data have attributes (dimensions)
  • Visualizations have attributes (dimensions)
  • Can the two map to each other?
  • Jacques Bertin, SemiologieGraphique (Semiology of Graphcis), 1967.
elements of visualization
Elements of Visualization
  • Images are composed of marks: “ink”, graphical primitives

Slide courtesy of Sara Su

elements of visualization1
Elements of Visualization

Slide courtesy of Sara Su

value intensity
Value (Intensity)

Discrete or Continuous?

Slide courtesy of Sara Su

color hue
Color (Hue)

Discrete or Continuous?

Slide courtesy of Sara Su

visual variables
Visual Variables

Slide courtesy of Sara Su

appropriateness
Appropriateness?
  • Which data dimension should be mapped to what visual variable?
using visualization to influence
Using Visualization to Influence?

Image courtesy of http://sambbiblog.spaces.live.com

2008 election map
2008 Election Map

Image courtesy of http://politicalmaps.org

2008 election map1
2008 Election Map

Image courtesy of http://politicalmaps.org

2008 election map2
2008 Election Map

Image courtesy of http://politicalmaps.org

structure and form
Structure and Form

Image courtesy of Barbara Tversky

structure and form1
Structure and Form

Image courtesy of Barbara Tversky

visual metaphors
Visual Metaphors

Image courtesy Caroline Ziemkiewicz