One of these locations is Lake Tuz, located in the Central Anatolia Region of Turkey. Every summer, the 50x31 mile lake dries out revealing its white, salt-rich floor. Just as we Earthlings can hold up and photograph a white sheet of paper or gray card to set a custom white balance, satellite mounted cameras can potentially utilize Lake Tuz to do the exact same thing—just on a much larger scale. This is very reassuring news as Earth-observing satellites have become an integral part of tracking and measuring things like climate change, coastal erosion and natural disasters. Unfortunately, poor calibration of these cameras can greatly throw off the accuracy of the data collected.