History: Photo Calibration Targets

Source: THE CENTER FOR LAND USE INTERPRETATION
dedicated to the increase and diffusion of knowledge about how the nation's lands are apportioned, utilized, and perceived           

Photo Calibration Targets Terrestrial Test Patterns Used for Aerial Imaging

Test Target near Edwards Air force Base (Google Maps)

Interesting!
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I'm gonna paint one of those on my roof.

I have seen small L shaped ones here, usually along a Township, Range, Section line somewhere.