Rectangular hierarchy showing parent-child relationships as nested horizontal bands. Each level of the hierarchy occupies a horizontal band, with widths proportional to values, making it easy to trace lineage from root to leaf.
Space Missions by Destination — Historical Mission Count
Best for
- Showing clear parent-child lineage in hierarchical data
- Comparing proportions at each level of a hierarchy
- Displaying organizational or taxonomic structures
Avoid when
- The hierarchy is very deep — bands become too thin to read
- You need to show relationships that are not strictly hierarchical
- Leaf nodes have very small values relative to siblings