Federal
- The National Map (USGS)
- US Forest Service SW Region
- Bureau of Land Management GeoSpatial Downloads
- USGS: San Francisco Bay and Delta
- NSF OpenTopography
- The U.S. Government’s open data
- National Historical GIS, for historical census and boundary data
- Natural Resources Conservation Service: Soil Geography (surveys, etc.)
- National Geologic Map Database
- Soils Data from ArcGIS Online
Coastal, estuarine, and oceanographic data
- NODC: National Oceanographic Data Center (NOAA)
- MBARI: Monterey Bay Aquarium Research Institute
- Pacific Coastal & Marine Science Center (USGS)
- SF Estuary Institute Data Center
Imagery
- EROS: Earth Resources Observation and Science Center (USGS)
- Landsat Data from libra developmentseed org
- Remote Sensing Lab (US Forest Service)
- NOAA Data Access Viewer (Imagery, land cover, elevation)
State of California
- dataset from California Open Data
- FRAP: Fire and Resources Assessment Program (California Department of Forestry and Fire Protection)
- Air Quality Monitoring (Air Resources Board)
- Pacific Veg Map
Web Data Collections and Specialty Datasets
- OpenStreetMap
- datahub
- Shaded Relief Archive
- Natural Earth Data: regional scale cartographic data
- NSF OpenTopography
- Historic Topographic Maps of California (UCB)
- San Mateo County Finescale Vegetation
- Max Kirkeberg Collection: photographic documentation of SF by Professor Emeritus Max Kirkeberg