LIDAR stands for light detection and ranging. LIDAR images is a form of radar that uses light to reflect an image. The light comes from a laser and reflected back. The image above is a LIDAR image of the World Trade Center after the attack on September 11, 2001. In the image you can see the depression in the ground where the WTC stood and the hight of the buildings around it. The LIDAR imagery reflects the size of the damage and the height of the buildings around the damage as a comparison.
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