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Information Visualization

Learn about transforming raw data tables into visual structures for enhanced perception and understanding. Explore relational descriptions, data transformations, human interaction, and visual mappings. Discover key concepts like variable types, spatial substrates, marks, retinal properties, and view transformations. Dive into the world of information visualization to develop effective mappings and improve cognition.

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Information Visualization

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Presentation Transcript

  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 -> attribute; Case -> 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 • Perception…and 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

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