Warrior for Truth
Have you ever head the term “The Ground Truth”? Spies say it when they want to know what really went down, no cover-ups and no interpretations. Apparently in life or death spy situations it’s important to know the ground truth in order to move forward in the mission. In NASA, the ground truth is part of the calibration process where a person on the ground makes a measurement of the same thing the satellite is trying to measure at the same time. The two answers are then compared to help evaluate how well the satellite instrument is performing.