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Perceptual guidelines for creating rectangular treemaps.

Nicholas Kong1, Jeffrey Heer, Maneesh Agrawala

  • 1Computer Science Division, University of California at Berkeley, Berkeley, CA 94720, USA. nkong@cs.berkeley.edu

IEEE Transactions on Visualization and Computer Graphics
|October 27, 2010
PubMed
Summary
This summary is machine-generated.

Treemaps effectively visualize hierarchical data, but optimal design requires careful aspect ratio management. Extreme aspect ratios and squares reduce accuracy; non-squares avoiding extremes are best for effective treemap visualizations.

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Area of Science:

  • Information Visualization
  • Human-Computer Interaction
  • Data Visualization

Background:

  • Treemaps are space-filling visualizations for hierarchical data.
  • Effective treemap design involves managing parameters like rectangle aspect ratio and luminance.
  • Area encoding in treemaps can be less accurate than length encoding.

Purpose of the Study:

  • To establish design guidelines for effective rectangular treemaps.
  • To investigate the impact of aspect ratio and luminance on treemap accuracy.
  • To compare treemaps with hierarchical bar charts for data density and judgment accuracy.

Main Methods:

  • Controlled experiments to assess area judgments based on rectangle aspect ratio and luminance.
  • Comparison of treemap accuracy and speed against hierarchical bar charts across varying data densities.
  • Analysis of judgment accuracy for both leaf and non-leaf nodes in hierarchical data.

Main Results:

  • Luminance did not significantly affect area judgments.
  • Extreme aspect ratios and square rectangles negatively impact area comparison accuracy.
  • Optimal treemap aspect ratio distributions avoid extremes and include non-squares.
  • Treemaps offer comparable or faster comparisons than bar charts, even at lower data densities.

Conclusions:

  • Design guidelines for rectangular treemaps should prioritize aspect ratio management, avoiding extremes.
  • Treemaps are effective visualization tools, particularly when data density increases.
  • Further research into treemap layout alternatives can enhance their perceptual effectiveness.