The USGS EarthExplorer map can be used to search, preview, and download existing digital files at no cost.
The National Aerial Photography Program (NAPP) provides more than 1.3 million cloud-free black-and-white and color infrared aerial photographs over the United States obtained from an altitude of 20,000 feet. Photographs are available as medium or high resolution digital images (1987-2007).
Single frame records include black-and-white, natural color, and color infrared aerial photographs over the United States available in a digital format at a resolution of 400 or 1,000 dpi (1937 through the present).
The Wisconsin Catalog of Aerial Photography provides a comprehensive listing of aerial photography acquired by federal, state, and local agencies and other groups, separated by county. This catalog is the most complete record of aerial photography in Wisconsin to date, containing information for over 3,000 projects.