# Layouts and Hierarchies

## Data Hierarchy
- [d3-hierarchy](https://github.com/d3/d3-hierarchy/tree/main/docs): Essential for Sunbursts, Treemaps, and Circle Packing.
- [d3-force](https://github.com/d3/d3-force/tree/main/docs): Physics simulation for graphs (Force-Directed).

## Geographic Visualization
- [d3-geo](https://github.com/d3/d3-geo/tree/main/docs): Projections, GeoJSON, and geographic calculations.