Lidar (source code)
= Lidar
= Light detection and ranging
{synonym}
Range measurement using transmitted <laser> light and its returned signal. For a pulse traveling a round trip in air, the elementary range is $r\simeq c\Delta t/2$, where $c$ is the propagation speed and $\Delta t$ the measured travel time. Sensor position, pointing and time synchronization place returns in a three-dimensional point cloud. Scanning <lidar> can record multiple returns from vegetation and the ground; a return is an observation of a reflecting surface, not automatically bare-earth elevation.
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