LIGHT DETECTION AND RANGING SURVEY (LIDAR)

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LIGHT DETECTION AND RANGING SURVEY (LIDAR) TECHNIQUE:

National High-Speed Rail Corporation Limited will be adopting Light Detection and Ranging Survey (LiDAR) technique using Laser enabled equipment mounted on a Helicopter for conducting the ground survey for the preparation of a Detailed Project Report for the proposed Delhi-Varanasi HSR corridor.

What is LiDAR?

It is a remote sensing method that uses light in the form of a pulsed laser to measure ranges (variable distances) to the Earth.
These light pulses—combined with other data recorded by the airborne system— generate precise, three-dimensional information about the shape of the Earth and its surface characteristics.

How does it work?

LiDAR follows a simple principle — throw laser light at an object on the earth's surface and calculate the time it takes to return to the LiDAR source.
Given the speed at which the light travels (approximately 186,000 miles per second), the process of measuring the exact distance through LiDAR appears to be incredibly fast.
A lidar instrument principally consists of a laser, a scanner, and a specialized GPS receiver.
Aeroplanes and helicopters are the most commonly used platforms for acquiring lidar data over broad areas.

Source: TH

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