http://www.nasa.gov/images/content/55642main_lidar2.jpgLIDAR differs from radar or Doppler in its use laser per class notes: "light amplification by stimulated emission of radiation") to produce images.
According to the website http://twistedphysics.typepad.com/cocktail_party_physics/2007/09/index.html,
the uses of LIDAR are expanding from the detailed information we have gotten regarding surface changes, environmental changes, and elevations (accurate to approximately 6 inches in elevation), to include geology, seismology archeology and search & rescue efforts.
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