Vega Treemap Hierarchy
A squarified treemap where every leaf rectangle's area is proportional to its value and parent groups stay visually adjacent — the canonical 'show me a hierarchy by size' chart. This is a low-level Vega spec because the layout requires hierarchical data via the `stratify` transfo
Template details
- chart
- treemap
- hierarchy
- vega
When to use this template
This visualization excels at revealing the relative size of individual items within a nested hierarchy, making it easy to identify dominant contributors at each level of aggregation. Analysts reach for it to understand how a total quantity is distributed across various categories and subcategories, quickly spotting large segments and their constituent parts.
- Hierarchical data with clearly defined parent-child relationships.
- A single quantitative measure for leaf nodes, determining area.
- Multiple categorical dimensions defining the hierarchy levels.
- Datasets where part-to-whole comparisons are crucial.
- When relative proportions are more important than exact numerical values.
- Large datasets with many leaf nodes where space efficiency is valued.