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Information Visualization Chapter 1 - Continued. Reference Model Visualization: Mapping from data to visual form Raw DataData Tables Visual Structures.

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Presentation on theme: "Information Visualization Chapter 1 - Continued. Reference Model Visualization: Mapping from data to visual form Raw DataData Tables Visual Structures."— Presentation transcript:

1 Information Visualization Chapter 1 - Continued

2 Reference Model Visualization: Mapping from data to visual form Raw DataData Tables Visual Structures Views Data Transformations Visual Mappings View Transformations DATAVISUAL FORM Human Interaction

3 Data Tables  Relational descriptions of data extended to include metadata CaseiCasejCasek VariablexValueixValuejxValuekx… VariableyValueiyValuejyValueky… …………… 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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