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Portrait of Marie Antoinette by Jean-Francois Janinet, 1777. Color etching and engraving with gold leaf printed on two sheets, 30x13.5 in.
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Battle of Puebla. Cinco de Mayo. General Porfirio Diaz leads Mexican cavalry to victory against the French lead by General Charles Lorencez at Puebla, Mexico April 2, 1867. Oil on canvas, 1902. May 5, 1862. General Ignacio Zaragoza
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earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
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laser beam

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use in lidar

  • A lidar map of the World Trade Center site (below centre left) and vicinity after the September 11 attacks, New York City, 2001. Lidar data helped to identify the height of the rubble so that appropriate cranes could be used to remove it. The lidar data collected from flyovers provided building and utility engineers with the information they needed to locate the World Trade Center's original foundation support structures.
    In lidar

    …an object by transmitting a laser beam, usually from an airplane, at the object and measuring the time the light takes to return to the transmitter. The word lidar is derived from light detection and ranging.

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