GlobeXplorer
GlobeXplorer provides online access to the world's largest commercial library of georeferenced aerial/satellite imagery and map data.

Google Earth
Google Earth combines satellite imagery and maps even allowing for Google searches of the planet.

Maptech's Mapserver
Maptech's MapServer allows access to the largest online database of NOAA digital charts and USGS maps available in the world.

Microsoft TerraServer
A large repository of aerial photographs and satellite images available for on-line viewing or for purchase.

National Digital Orthophoto Program (NDOP)
The home of the National Digital Orthophoto Program (NDOP) including description, standards and specifications, metadata, project status and ordering information for Digital Orthophoto Quadrangles (DOQs).

OrthoFinder
An interactive site that allows you to locate and learn about digital orthophotography in the state of Wisconsin.

U.S. Government Aerial Photography
A guide to the U.S. Government Aerial Photography data set which includes film obtained by various government agencies.

USGS Digital Backyard
An introduction to aerial photographs, digital orthophoto quadrangles (DOQs), topographic maps, and digital raster graphics (DRGs) from the USGS.

USGS PhotoFinder
A quick and easy way to find and order USGS National Aerial Photography Program (NAPP) photos.

Wisconsin Catalog of Aerial Photography (SCO)
A comprehensive listing of aerial photography acquired by federal, state and local agencies as well as other groups.

Wisconsin's Statewide Forest Aerial Photography Project
The home of the Wisconsin DNR's project to photograph one quarter of the state every two years.

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