Data Clearinghouses | San Francisco Bay Area Data | California State Data | U.S. State Data | International Data | Imagery | USGS Data | Land Cover Data | Miscellaneous Data Links | GIS Data Bookmarks File
See our Finding Data page for general guidelines about finding GIS data.
National Data Clearinghouses
- Federal Geospatial Data Clearinghouse Search Engine
- GIS Data Depot
- The Geography Network (ESRI's data clearinghouse and map services)
- Geospatial One Stop - U.S., Federal, State & Local GIS Data
- National Atlas of the United States - US biology, geology, demography, environmental, water and much more.
- The National Map - Access to high-quality, geospatial data from the USGS
- Starting the Hunt: Guide To Mostly On-line And Mostly Free U.S. Geospatial Data
- National Historical Geographic Information System - aggregate census data with boundary files
San Francisco Bay Area
- Association of Bay Area Governments (ABAG)
- San Francisco Bay Area Regional Database (BARD)
- Bay Area DEMs
- Northern California Earthquake Data Center
- CaSIL: California Spatial Information Library
Includes administrative divisions (counties, congressional districts, Dept. of Fish and Game Regions, Caltrans districts); cultural geography (census block and block group data, census tracks, urban areas); facilities, structures, and buildings; political districts (assembly, congressional, senate); physical geography (bioregions, DEMs, hydrography, precipitation, etc.); transportation networks and models (roads, highways, railroads); fresh water resources and characteristics. - California Vegetation Map Catalog
Includes vegetation map data sets that cover the entire state or specific parts of the state, with an emphasis on county-level or larger data sets. - Soil Information for Environmental Modeling and Ecosystem Management
California data can be downloaded in Arc/INFO format files. Includes crop yield
information, soil interpretation ratings, and plant composition and percentage. - California Gap Analysis Project
- California Earthquakes – up to date, downloadable ground motion maps in GIS format.
- California Seismic Hazard Mapping
- California Department of Fish and Game Data Site
Includes bathymetry, hydrological data, biological data, and more. - U.S. Fish And Wildlife Service Data for California
International Data
- ADDS - Africa Data Dissemination Service
- Antarctic Digital Data
- Center for International Earth Science Information Network (CIESIN)
- Central Africal Regional Program for the Environment
- Digital Chart of the World Server
- Data Depot's Country List
- GeoBase: Canadian site for sources of free GIS data
- GeoGratis: Canada's National Digital Atlas
- Geoscience Australia
- Gridded Population of the World
- GoGeo GIS Database (UK)
- Russian Federation Digital Data
- Southern Africa Regional Science Initiative (SAFARI)
For an extensive listing of foreign data sites please see the GIS Data Bookmarks section.
Imagery
Mostly free access to satellite and aerial imagery
- Arizona Regional Image Archive (AVHRR, AVIRIS, MSS, TM, SPOT for six southwestern states including California)
- Canadian Geospatial Data Infrastructure
- Earth Explorer (Landsat, AVHRR and aerial photos)
- Earth Observing System Data Gateway (Atmosphere, land, ocean, solar and cryosphere imagery)
- Geoscience Australia (Free Landsat 7, MODIS & AVHRR data)
- Global Land Cover Facility (ASTER, Landsat, MODIS, AVHRR)
- Global Visualization Viewer (Free ASTER, MODIS and Landsat Imagery)
- Landsat.org (Huge collection of Landsat imagery; not all free)
- NASA Image Server (Landsat 4,5,7)
- Terraserver (Quickie air photo images from Microsoft)
- University of Nevada Landsat TM Archive (State of Nevada)
- USGS EROS Data Center (Many sensors with links to data access)
| Land Cover Data |
- The U.S. Environmental Protection Agency's Land Cover Data Directory
- Global Land Cover 2000
- Global Land Cover Facility
- GAP analysis program (land cover data by U.S. State)
- USGS Geographic Data Download (older LULC data)
- National Land Cover Dataset from USGS (seamless and the most current for the US)
- NLCD Class Definitions in html or EXCEL .dbf format
Land Cover Data
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