Heatmaps & Treemaps

Summary

A heatmap uses color intensity to show magnitude across two categorical dimensions (e.g. day of week vs hour); a treemap shows hierarchical part-to-whole relationships using nested rectangles.

• 1Build a heatmap showing activity by day-of-week and hour-of-day.
• 2Build a treemap showing revenue breakdown by category and sub-category.
• 3Learn when these specialized charts add real clarity versus just novelty.