LIDAR stands for Light Detection and Ranging. It is equipment used to measure the distance to an object by illuminating the target, often by lasers. The image above is a LIDAR image taken by the National Oceanic and Atmospheric Administration of ground zero following the attacks on 9/11. They were able to compile a 3-D image based on what the LIDAR technology could pick up, from there crews could estimate the height of rubble they had to clear.
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