LIDAR or Light Detection and Ranging is technology that measures the properties of scattered light to find the range or other information about an object. The following picture is a LIDAR image of Mount St. Helens in Wasington State.http://vulcan.wr.usgs.gov/Volcanoes/MSH/Eruption04/Monitoring/ImagesGraphics/LIDAR_crater_dome_sept03_and_nov04_animated.gif
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