Those pulses are reflected or scattered back and their travel time is used to calculate the distance between the laser scanner and the ground.
The laser scanner transmits brief pulses of light to the ground surface. Light Detection and Ranging ( lidar) is a technology used to create high-resolution models of ground elevation with a vertical accuracy of 10 centimeters (4 inches). Lidar equipment, which includes a laser scanner, a Global Positioning System (GPS), and an Inertial Navigation System (INS), is typically mounted on a small aircraft.
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