Corona Satellite Calibration Targets, Cold War calibration site in Casa Grande, Arizona, US.
A network of 272 concrete Maltese crosses forms a 16-mile grid pattern across the desert landscape near Casa Grande, with each marker measuring 60 feet wide.
The US Army Map Service established this photogrammetric test range in the mid-1960s to validate aerial survey cameras and enhance mapping capabilities during the Cold War period.
The concrete markers represent advances in American photogrammetric technology, contributing to national defense strategies through precise aerial mapping and surveillance techniques.
Two preserved calibration targets remain visible at the intersections of South Montgomery with West Cornman Roads and West Cornman Road with Carmel Boulevard.
By the late 1970s, natural groundwater extraction caused land subsidence that affected the positioning of many concrete markers, leading to their gradual abandonment.
Location: Arizona
GPS coordinates: 32.77722,-111.73994
Latest update: March 18, 2025 00:28
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