LIDAR stands for Light Detection and Ranging. It is used from planes and uses a laser to generate light pulses, the same way radar uses radio waves. LIDAR is highly accurate and cost-effective for collecting elevation data. This particular picture is of Mt. St. Helens and is used in an eruption monitoring program. Animation of these LIDAR images. Which were taken from September 2003 to October 4, 2004, showing the increasingly deformed crater floor. New dome rocks didn't penetrate the floor until October 9, 2004. This will help in predicting an eruption in the future.
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