Information Visualization

1
Information Visualization

• Chapter 1 - Continued

2
Reference Model
Visualization Mapping from data to visual form
DATA
VISUAL FORM
Raw Data
Data Tables
Visual Structures
Views
View Transformations
Data Transformations
Visual Mappings
Human Interaction
3
Data Tables

• Relational descriptions of data extended to
  include metadata

Analogy to database Variable -gt attribute Case
-gt tuple or record
4
Data Tables (2)

• Variable Types
• N Nominal
• Unordered set
• O Ordinal
• Ordered set
• Q Quantitative
• Numeric range
• Metadata
• Structure

5
Data Transformations

• Values ? Derived Values
• Structure ? Derived Structure
• Values ? Derived Structure
• Structure ? Derived Values
• Examples?

6
Visual Structures

• Data Tables are mapped to Visual Structures
• Expressive, effective
• Perceptionand the human eye

7
Visual Structures (2)

• Spatial substrates
• Marks
• Graphical properties

8
Spatial Substrate

• Space is the container unto which other parts of
  Visual Structure are poured.
• Composition
• Alignment
• Folding
• Recursion
• Overloading

9
Marks

• Points
• Lines
• Areas
• Volumes
• Graphs and Trees to show relations or links
  among objects

10
Retinal Properties

• Type of graphical property
• Position/Size
• Gray Scale
• Orientation
• Color
• Texture
• Shape

11
Other Graphical Properties

• Crispness
• Resolution
• Transparency
• Arrangement
• Color value, hue, saturation
• Table 1.22
• Finally, temporal encoding for visual structures

12
View Transformations

• Interactively modify and augment Visual
  Structures
• Location Probes
• Viewpoint Controls
• Zoom, pan, clip
• Overview an detail
• Distortions
• To perceive larger Visual Structure via distortion

13
Human Interaction and Transformation

• Direct Manipulation
• Controlling Mappings

14
Conclusion

• Reference model approximates the basic steps for
  visualizing information
• Steps are an ongoing process with many iterations
• Goal of information visualization develop
  effective mappings to increase ability to
  think/to improve cognition