Spy Satellite Calibration Target

Spy Satellite Calibration Target


Casa Grande, Arizona (AZ), US
The white cross, located in Casa Grande, Ariz., was created in the 1960s and used by the United States military to calibrate its Corona spy satellites.

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Anonymous
@ 2011-11-19 07:15:24
There are many of these in the area. I've found over 100 of them with Google Earth. There used to be over 200 of them in a 12 mi x 16 mi grid, spaced every mile. Many, especially in Casa Grande and Arizona City, have been removed over the years as housing tracts, roads, and other construction has occurred.

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