LIDAR (light detection and ranging) is a laser-based imaging system that displays high-accuracy, high-density elevation data. This LIDAR image was from September 15, 2001 after the 9-11 tragedy and shows a 3-D model of the elevation of New York City in relation to the destruction/debris from the attack. Several of these images were taken over a span of several days to show the change in elevation of the destruction.
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