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It was originally called "Colidar" an acronym for "coherent light detecting and ranging," derived from the term " radar", itself an acronym for "radio detection and ranging". Intended for satellite tracking, this system combined laser-focused imaging with the ability to calculate distances by measuring the time for a signal to return using appropriate sensors and data acquisition electronics. Under the direction of Malcolm Stitch, the Hughes Aircraft Company introduced the first lidar-like system in 1961, shortly after the invention of the laser.
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Lidar sometimes is called 3-D laser scanning, a special combination of 3-D scanning and laser scanning. Lidar is an acronym of "light detection and ranging" or "laser imaging, detection, and ranging". It has terrestrial, airborne, and mobile applications.
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Lidar can also be used to make digital 3-D representations of areas on the earth's surface and ocean bottom, due to differences in laser return times, and by varying laser wavelengths. Lidar ( / ˈ l aɪ d ɑːr/, also LIDAR, or LiDAR sometimes LADAR) is a method for determining ranges (variable distance) by targeting an object with a laser and measuring the time for the reflected light to return to the receiver. Vegetation heights are depicted in shades of green, where dark greens are closest to the ground and light greens are the highest. For ground-level features, colors range from deep brown to tan. This visualization shows an airplane collecting a 50-kilometer swath of lidar data over the Brazilian rainforest.