See the Strange, Beautiful Landscapes Below the Foliage and Buildings Revealed by Lasers.QuoteLIDAR, which stands for Light, Detection and Ranging, is a laser-guided mapping system that fire billions of laser pulses at an object, and like sonar or radar, gathers information about the object as the beams return.
https://www.goodnewsnetwork.org/lidar-reveals-geology-of-washington-state-and-natural-hazards/
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