http://www.noaanews.noaa.gov/stories/s798b.htm
LIDAR, which stands for "light detection and ranging" is a remote sensing technology that measures distance by illuminating a target with a laser and analyzing the reflected light. LIDAR can be used to measure distance, speed, rotation, chemical composition and concentration. The picture above is a LIDAR image from ground zero on September 27th, 2001. These were taken aerially from an altitude of 3,300 feet by NOAA.
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