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DAILY NEWS ANALYSIS

  • 03 December, 2020

  • 2 Min Read

LIGHT DETECTION AND RANGING SURVEY (LIDAR)

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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