[Data Visualization] Introduction to InfoVis (2)

The InfoVis Reference Model

• By Card, Mackinlay, and Shneiderman , 1999 Data

Visualization Design

• Task: identify trends of exports and imports
• Task: identify the difference between exports and imports

• Task: identify the difference between exports and imports

Preattentive Processing

• Our low-level visual system can process information very efficiently in a massively parallel manner.
• Visual popout
• How many ‘3’s?

Visual Popout

Relative versus Absolute Judgements

• Luminance perception is based on relative judgements

Color Constancy

• Black and blue? White and gold?

Separability

• Some channels have interactions with other channels!
  • Be careful when you use more than two channels at once.
• How accurately can people access information encoded by each channel?

Encoding Information

• Expressiveness and effectiveness

What-Why-How Examples