What do you understand by the term LIDAR ........

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What do you understand by the term LIDAR?

It is a new Radar based on the use of radio-waves for detecting objects in the sky

It is a technique of Remote Sensing that makes use of Light waves to build a 3-D image of the surroundings.

It refers to the new Airborne Radar system developed by DRDO for the Indian Airforce.

None of the above.

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Explanation:

It is a remote sensing method that uses narrow beam of light instead of radio-waves in the form of a pulsed laser to build a 3 -D image of surrounding landscape. The narrow beam of laser makes it possible to map objects with high degree of resolution.