LIDAR stands for light detection and ranging and it is a system used to determine elevation of a specific geographic area. LIDAR is a form of remote sensing that uses light technology to determine the distance to an object, or the ground. The most common tool used is laser technology which can determine accuracy down to a half foot. The LIDAR image above represents ground zero after September 11, 2001 with the green area in the center where the towers once were.

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