This index lists all of the map layers currently contained in nationalatlas.gov™, by broad subject categories that correspond to the chapters of the National Atlas. Data categories include Agriculture, Environment, People, Biology, Geology, Transportation, Boundaries, History, Water, Climate, and Map Reference. Most data is available as shapefiles.
Graphical Ontology Browser
- Click on a node to jump to the content of that node
- Pan to see the rest of the graph
- Scroll the mousewheel up and down to zoom in and out
- Rearrange the nodes in the graph by dragging a node to a different position