Light Detection and Ranging also known as LIDAR is a type of active remote sensing. The sensor is attached to an airplane along with a GPS and an inertial navigation system. LIDAR uses pulses of light to show the terrain. The elevation of terrain can be measured by recording the differences in time the laser takes to reach the point being measured. The pictures above show the differences in the LIDAR of the world trade center before and after the September 11th attacks.
http://www.loc.gov/exhibits/911/911-maps.html
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