DataViz Tip #27: Chart Types: Treemap
Treemaps are a great data visualization tool to represent data items as part of a whole. Items in a treemap are represented as rectangles proportionally to their value and fill up the entire chart area. This lets viewers perceive their relative size much better than with slices in a pie chart and it also lends itself to displaying more data items at once than you can reasonably fit in a pie chart. Especially when combined with interactivity features.
Multiple levels of data can be displayed in a treemap at once to show a deeper picture at a glance:
Alternatively drill-down functionality can be implemented to declutter the view and help viewers focus on one level at a time:
Try clicking on any of the tiles in the demo above to go a level deeper. Click on “Other” to go multiple levels down.
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