for almost two weeks over a 370-square-kilometer area around the temple. The helicopter carried $250,
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,000 worth of special equipment that fired millions of laser pulses every few seconds at the forest below. A small percentage of those pulses zipped in between trees and foliage to the forest floor. The Earth’s hard surface bounced those laser shots back to a sensor on the helicopter. This technique,
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, known as light detection and ranging,
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, or lidar for short, picked up differences in the contours of the land now obscured by jungle. With the findings, researchers could draw a picture of city blocks,
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, residential areas,
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, dried-out ponds and other archaeological remains. Results gleaned from lidar and from new ground-based investigations appeared in the December 2015 Antiquity.
Lidar has been around since the early 1960s. Scientists have used it to measure pollutants in the atmosphere,
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, map shorelines and guide robotic and manned vehicles around obstacles. Lower costs over the last decade have made the technology accessible to archaeologists.
With their laser eye in the sky,
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, Evans and colleagues uncovered big surprises at Angkor Wat. Just beyond one side of the roughly 1.3-kilometer-square moat surrounding the temple,
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, the researchers found six massive

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