Some software systems and tools use States as their unit of observation. Ecological data such as counts of threatened or endangered are often summarized to States, but it is probably even more common to use States as the unit of analysis when the focus is primarily on socioeconomic issues.
Spatial Analysis Unit
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