Data Visualization Principles: Other Perceptual Channels CSC444 - - PowerPoint PPT Presentation

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Data Visualization Principles: Other Perceptual Channels CSC444 - - PowerPoint PPT Presentation

Dec 13, 2023 338 likes •610 views

Data Visualization Principles: Other Perceptual Channels CSC444 Acknowledgments for todays lecture: Tamara Munzner, Miriah Meyer, Colin Ware, Penny Rheingans History Time! Gustav Fechner, 18011887 Founder of psychophysics (What?)

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Data Visualization Principles: Other Perceptual Channels

CSC444

Acknowledgments for today’s lecture: Tamara Munzner, Miriah Meyer, Colin Ware, Penny Rheingans

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History Time!

Gustav Fechner, 1801–1887 Founder of psychophysics (What?)

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Psychophysics

  • Some stuff that happens in the “external

world” (outside your own body) causes stuff to happen “in your head”

  • Some of it is simple enough to study: that’s

psychophysics

  • “the scientific study of the relation between

stimulus and sensation"

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Stephens’s Power Law

Source: Stephens’s “Psychophysics”

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There exist stimuli

  • ther than colors
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From Stephens’s Psychophysics:

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So what is data visualization?

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The art and science of matching the “features” of a data set to the “features” of visual perception

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Why visualization?

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Why visualization?

  • It has been studied more deeply
  • It appears to have more “bandwidth” than

alternatives (though not as much as you think it does)

  • It is richer
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(c) PlusMinus, GFDL

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THE STANDARD VISUAL CHANNELS

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Cleveland/McGill perception papers

  • The beginning of visualization as an experimental

science

  • Required reading for ALL students!
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Cleveland/McGill perception papers

Better to worse:

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Pie Chart Bad, Scatterplot Good

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Integral vs. Separable Channels

  • Do humans perceive values “as a whole”, or “as

things that naturally split”?

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Integral vs. Separable Channels

(color, location) (color, motion) color x shape size x orientation x-size x y-size r-g x y-b

Colin Ware, 2004, p180 Separable Integral

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Bivariate Color Map (Bad)

Baraba and Finkner, via Tufte (VDQI)

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Bivariate Color Map (less bad)

http://www.csee.umbc.edu/~rheingan/636/color.pdf

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Trivariate (!) Color Map (terrible, terrible idea)

http://magazine.good.is/infographics/america-s-richest-counties-and-best-educated-counties#open

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The best bivariate colormap I know

http://www.nytimes.com/interactive/2014/11/04/upshot/senate-maps.html

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Bivariate Color Maps are Possible, but Hard

pay attention to the behavior of the variables you’re mapping from, and the behavior of the channels you’re mapping to.