Reference index / 행렬·시간·공간 밀도
Calendar Heatmap
Uses calendar-aligned cells to encode daily values by color.
When to use it
Use when designing matrices & density and selecting analytical visualizations.
Caveats and distinctions
Weekday, week and month structure distinguish it from a generic matrix.
Implementation and classification
데이터 시각화 / 행렬·시간·공간 밀도
Sources and verification status
https://vega.github.io/vega-lite/examples/
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