LIDAR is a remote sensing technique that fires laser light at an object and collects data based on the objects resulting illumination. Laser instruments are attached to aircraft and data is collected as the aircraft passes over an object. High resolution beams can produce very precise images, but have a narrower beam size and therefore take longer to produce a complete image. The image above is a LIDAR image of the world trade center on September 23rd, 2001.
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