Heatmaps | How to Use and Best Practices

Heatmaps | How to Use and Best Practices

 
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Heat-maps

  • Generally, 2 dimensions and 1 measure are required.

  • 1 dimension goes on X-Axis

  • other dimension goes on Y-axis

  • The measure goes on the color intensity

 
 

Basic Structure

  • The chart is used to reveal hotspots and patterns

  • Diverging color preferred over continuous

  • Measures used are mostly ratio instead of SUM

  • Both dimensions are cross-sectional, not hierarchical

 
 

Variations

  • Calendar Heatmap for daily and weekly pattern

  • Long term changes for slowly changing measures like global temperature

  • Geographic heatmaps to find geo-clusters

  • Layout based heatmaps in sports, webpage analytics, stadium attendance, street-level activities

 
 

Best Practices for Heatmap

  • A good diverging theme is important that stands out

  • Don’t use X-Y dimensions which do not intersect a lot

  • Ensure to have enough sample size for each cell to avoid extreme values based on a very small sample

 
 

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