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Found in Google Maps, these are not strange alien markings, but optometry charts for spy planes and satellites. 

"The Center for Land Use Interpretation … says the patterns were laid mostly in the 50s and 60s to aide with the calibration of cameras on planes such as the SR-71."

Like we have to identify letters in an eye test, these symbols are used by spy planes to correctly identify and test their software. The ones above are believed to have been created by China in 2011 in the Gobi desert.