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Google Engineering Director Luc Vincent demonstrates how Google captures images in hard-to-reach places with Street View Trekker at the Google offices. Google is deploying a fleet of small, camera-equipped airplanes above several cities, the Internet search company's latest step in its ambitious and sometimes controversial plan to create a digital map of the world. Google plans to release the first three-dimensional maps for several cities by the end of the year, the company says.

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