The Imagery Explorer showcases the Chicago Metropolitan Agency for Planning’s large collection of historical aerial photographs of northeastern Illinois from 1970 through 1995. The archive includes 6,300 images in 6 of the region’s counties.

Historic aerial photographs are valuable resources for planning activities like landscape and land use analysis, environmental impact assessments, development projects, and education. These images provide a method for examining changes in properties, neighborhoods, and land use in general. You also can examine changes in historical, environmental, or architectural information about certain sites over time.