National Data:
USGS Data
USGS Digital-Ortho Quarter-Quads - USGS DOQQ are 1-meter resolution ortho photography in true color, false color infra-red and Black and White. The images are in GeoTiff format and NAD83 UTM Meters. The images are available from the USGS and many state, local and commerical sources.
USGS Digital Raster Graphics - USGS DRGs are scanned images of the USGS series topographic maps. DRGs are 16 color images in GeoTiff format at 250 DPI UTM Meters. Available from the USGS, many state and local agenicies and commerical sources.
USGS Urban Area - Available for 133 of the most populated areas in the United States. These images are 24-bit true color at 1-foot resolution. The images are in GeoTiff Format and State Plane projection. Available from the USGS, TerraServer, state and local agencies. These are the high quality images seen in Google Earth and NASA World Wind.
USDA Data
USDA National Agriculture Imagery Program (NAIP) - USDA NAIP imagery is 24-bit true color imagery with one meter resolution. Available in either by county as MrSid format or DOQQ as GeoTiff, the projection is NAD83 UTM meters. Imagery is available from the USDA, state or commerical sources.
Other Data
Google Earth - Google earth provides seamless map, aerial photography and satellite imagary for the earth. Images are in geographic coordinates WGS84.
NASA World Wind - Similar to Google Earth and features NASA and USGS imagery. Imagery is in geographic coordinates WGS84.
TerraServer Download Site - MicroSoft hosted site for the browsing and downloading of USGS image data. Imagery is in UTM NAD83 meters.
State Data:
Alabama:
Alaska:
Arizona:
- CASA, Center for Applied Spatial Analysis, University of Arizona, applies GIS to research within the College of Social and Behavioural Sciences.
- Department of Transportation T-Map, Interactive mapping application.
- AGIC, Arizona Geographic Information Council
- Arizona Land Resource Information System, ALRIS - Documentation for orderable data sets.
- The Arizona Regional Image Archive - is an interdisciplinary resource system for digital image and map data for the Sonoran desert region, including the US Southwest and northern Mexico. Includes over 6,000 DOQQs online!
- Arizona State University Libraries Library Datasets and links to city, county and state data sources.
- Department of Fish and Wildlife, Arizona GIS Datasets
- SAGIS, Southern Arizona Geographic Information Systems Consortium
- State Land Department Maps Page
Arkansas:
California:
- Association of Bay Area Governments, ABAG, Regional Data Center - Census, employment, retail, zip code data and projections.
- California Geographical Survey, Dept. of Geography, California State University, Northridge - Downloadable census, TIGER and DEM data for California and the US.
- California Environmental Resources Evaluation System, CERES - Developing an electronic system to facilitate access to a variety of spatial and environmental data. Among the many currently available facilities is the CERES Environmental Informational Catalog which allows users to retrieve metadata or GIS data using title, type, organization, or keyword.
- California Spatial Info Library
- California State Lands Commission: Has biological, cultural, economic and physical GIS data for download.
- Shipwrecks Database - Page includes historical information and a database of shipwrecks of the California Coast.
- Bay Area Automated Mapping Association (BAAMA) Comprehensive list of GIS information for the Bay Area and northern California.
- Land use Planning Information Network (LUPIN) - Searchable index of land use and planning information (clickable map and text interfaces).
- Northern Sierra Nevada Geographic Information
- Russian River Spatial Data - Downloadable habitat-related shapefiles.
- San Diego Association of Governments (SANDAG) - Provides selected digital thematic geographic data layers in ArcInfo export format.
- San Francisco Bay Area Regional Database (BARD) - Access to DEMs, DRGs, DLGs, DRQs, some DOQs for Bay Area Region.
- University of California, Berkeley, Earth Sciences and Map Library GIS data page.
Colorado:
Connecticut:
Delaware:
Florida:
Georgia:
Hawaii:
Idaho:
Illinois:
Indiana:
Iowa:
Kansas:
Kentucky:
- Kentucky Geological Survey - The Kentucky Geological Survey has some electronic maps (GIS coverages) and DOQs that are available by FTP downloading. The files are ArcView shapefiles (registered by ESRI). The files were zipped using the WinZip utility. ALL the datasets, unless explicitly noted, are in latitude and longitude, decimal degrees, NAD83.
- Kentucky Office of GIS - State GIS server with downloadable DRGs, DEMs and other thematic information.
Louisiana:
Maine:
Maryland:
Massachusetts:
Michigan:
- Michigan Information Center - The Michigan Information Center (MIC) Although MIC focuses primarily on Michigan data, it receives and archives census data for the region, other states, and the nation. Data originally accessed through the state DNR is now at MIC.
Minnesota:
- Minnesota Land Management Information Center - Summarized statistical data available in 20 different databases. Boundary files and DOQs.
- Minnesota Legislative GIS Office - Links to Minnesota Information Only.
- ForNet - Program developed by Minnesota Department of Natural Resources and NASA, this innovative site provides a means for viewing Landsat photography of the entire state of Minnesota. This site also provides an interactive map browser that allows one to view data from the DNR Forestry database.
Mississippi:
Missouri:
Montana:
- EPA Region 8 GIS Data
- Geographic Information and Analysis Center(GIAC) at Montana State University. Includes Greater Yellowstone Atlas.
- GIS data sets - A huge array of administrative districts, land boundaries, educational, park, electoral divisions, mines,landfills, energy sites, water stations.
- Montana Natural Resource Information System - From the Montana State Library. Provides access to GIFs, ARC/INFO export files, and documentation for numerous thematic coverages. Spatial freeWAIS search engine allows user to conduct queries for spatial data sets using keyword and coordinate inputs.
- USGS Water Resources of Montana - This site is primarily a source for real-time and historic Stream data.
Nebraska:
Nevada:
New Jersey:
New Hampshire:
New Mexico:
New York:
North Carolina:
North Dakota:
- North Dakota State GIS Center - Portal to North Dakota geospatial data and information; collaborative effort by North Dakota state agencies, local government, and private enterprise.
- North Dakota State Data Center - Official source of population and socio-economic statistics. The NDSDC also serves as the state's liaison to the U.S. Census Bureau and as the representative to the Federal State Cooperative Programs for Population Estimates and Projections.
Ohio:
Oklahoma:
Oregon:
Pennsylvania:
Rhode Island:
South Carolina:
South Dakota:
Tennessee:
Texas:
Utah:
Vermont:
Virginia:
Washington:
West Virginia:
- West Virginia GIS Data Repository - Service provided by West Virginia Division of Environmental Protection. DEMS, basemaps, toxic release data and water data. Web-based map generation also provided.
Wisconsin:
Wyoming:
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