The U.S. Geological Survey (USGS) is to the American physical landscape what the Census Bureau is to its population — the authoritative source of scientific data about terrain, water, geology, natural hazards, and land cover. Several of the most important datasets listed elsewhere on this site originate from USGS: Landsat imagery, SRTM elevation, NLCD land cover, and the 3DEP LiDAR program all come from or are distributed through USGS infrastructure.
For GIS professionals working on U.S. environmental, infrastructure, or natural resource projects, USGS products form the baseline layers that most other data gets overlaid on — the elevation model, the stream network, the land cover classification, and the geological context.
Like NOAA, USGS distributes data across multiple specialized portals rather than a single catalog: The National Map for base geographic data, EarthExplorer for satellite and aerial imagery, ScienceBase for research datasets, and individual program pages for earthquake hazards, streamflow gauges, and volcanic monitoring. This can make discovery challenging, but it reflects the breadth of what USGS covers — from 1-meter LiDAR DEMs and flow-attributed river networks to historical topographic maps and real-time seismic data.
Everything is public domain with no usage restrictions, and the datasets are designed to interoperate: NLCD land cover aligns with 3DEP elevation, the National Hydrography Dataset integrates with watershed boundaries, and all of it ties back to the same coordinate systems and geographic frameworks that the broader U.S. federal data ecosystem uses.
