Light Detection And Ranging is an optical remote sensing technology that measures properties of scattered light to directed at a specific target to generate range and other information desired. The time delay between the transmission of the pulse and when it is detected again is what determines this range and detects elevations on the surface. This image is a LIDAR of Manhattan.
http://www.noaanews.noaa.gov/stories/images/manhattan-lidar092701b.jpg
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