Administrative & Political
GADM
Administrative Areas
Global administrative boundary regions — countries, states, counties, and sub-national units.
U.S. Census Bureau
CBSA Census Regions
Core Based Statistical Areas including metropolitan and micropolitan statistical areas.
Dept. of Justice
Federal Judicial Districts
U.S. federal judicial district boundaries for legal and administrative purposes.
Environmental & Climate
EPA
Air Quality
Air quality monitoring observations, pollutant measurements, and AQI reporting vocabularies.
NOAA
Climate Division Observations
Climate division boundaries and long-term normals, temperature, and precipitation observations.
NOAA
National Weather Zones
NWS public forecast zones and fire weather zones for operational forecasting and alerts.
Natural Hazards
USGS
Earthquake Events
Seismic event ontology covering earthquake location, magnitude, depth, and shake intensity.
NOAA
Hurricane Tracks
Best Track (HURDAT2) ontology for Atlantic and Pacific tropical storm trajectory observations.
MTBS
Wildfire Burn Areas
Wildfire perimeter and burn severity classification for fires across the United States.
NIFC
Active Wildfire Incidents
Active incident reporting covering perimeters, containment status, and resource data.