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

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Presentation transcript:

Information Visualization Chapter 1 - Continued

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

Data Tables  Relational descriptions of data extended to include metadata CaseiCasejCasek VariablexValueixValuejxValuekx… VariableyValueiyValuejyValueky… …………… Analogy to database: Variable -> attribute; Case -> tuple or record

Data Tables (2)  Variable Types N = Nominal Unordered set O = Ordinal Ordered set Q = Quantitative Numeric range  Metadata Structure

Data Transformations  Values  Derived Values  Structure  Derived Structure  Values  Derived Structure  Structure  Derived Values  Examples?

Visual Structures  Data Tables are mapped to Visual Structures  Expressive, effective  Perception…and the human eye…

Visual Structures (2)  Spatial substrates  Marks  Graphical properties

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

Marks  Points  Lines  Areas  Volumes  Graphs and Trees – to show relations or links among objects

Retinal Properties  Type of graphical property  Position/Size  Gray Scale  Orientation  Color  Texture  Shape

Other Graphical Properties  Crispness  Resolution  Transparency  Arrangement  Color: value, hue, saturation  Table 1.22  Finally, temporal encoding for visual structures

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

Human Interaction and Transformation  Direct Manipulation  Controlling Mappings

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