LIDAR (Light Detection and Ranging)- A type of active remote sensing (generates its own electromagnetic radiation). Uses a laser (light amplification by stimulated emission of radiation) which is transmitted from a narrow-band sensor (receives a limited range of wavelengths) to the observed object, then back to the sensor. Can record elevation to centimeter accuracy. This LIDAR image of the former World Trade Center was taken to indicate elevation of the remaining rubble for clean-up purposes (http://www.noaanews.noaa.gov/stories/s798.htm).
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