Turkish Lake Helps White Balance Satellites

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Here's a question that I bet you didn't know the answer to.  Just how do they calibrate satellite images?  It's not like we can just send up an astronaut with a white card into space every time we need to set something up.

The National Physical Laboratory has the answer.  Rather than go with traditional methods, they're using a dried up lake in Turkey as their target.  Lake Tuz is just one of eight different sights picked for such a purpose, and it's the first one being used.

Scientists on the ground will be taking readings of the site and comparing them to readings from the satellite.  From there, they'll adjust their instruments, take more readings and compare again, repeating the process until it's nice and balanced.

The calibration has begun and will be going until the 25th.