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  2020-04-12

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Some First Class stamps http://fittor.fun/gf14-net/ juggan kazim The term is actually a scientific concept defined by NASA as part of the calibration process of satellite imagery. When NASA measures something with a satellite, an employee on the ground takes the same measurement. That human measurement is known as &ldquo;ground truth.&rdquo; If the results differ, the "ground truth" has greater credibility than the satellite does.

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