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LiDAR determines ground height by measuring

  • A.the return time of emitted laser pulses
  • B.the parallax between two photographs
  • C.the angle subtended at two known stations
  • D.the pressure difference with altitude

Answer: A

Timing the pulse gives the range, and combining that with the position and attitude of the aircraft gives a coordinate for each return. Because some pulses reach the ground through gaps in a canopy, it can map terrain beneath forest.

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