Shorelines, defined as the wet/dry line, were digitized at 1:250 scale from modern aerial orthomosaics at select Chicago Beaches, managed by the Chicago Park District,  beginning in 2020 as part of an effort to monitor coastal change. Beaches include: Montrose Beach (MB), Foster Beach (FB), Rainbow Beach (RB), and 63rd St. Beach (63). The aerial images were collected using  an unoccupied aerial system (UAS) flown at select Chicago beaches under contract with the Illinois Department of Natural Resources Coastal Management Program and in cooperation with the Chicago Park Distrect.

Data are georeferenced to NAD83(1986) UTM Zone 16 North meters. All activities were conducted in adherence to Federal Aviation Administration regulations, permitted by the Illinois Natures Preserve Commissions and the Illinois Department of Natural Resources.