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News: National High Speed Rail Corporation Limited is adopting Light Detection and Ranging Survey(LiDAR) technique for conducting ground survey for the proposed Delhi-Varanasi High Speed Rail(HSR) corridor.
- LiDAR (Light Detection and Ranging): It is a remote sensing method that uses light in the form of a pulsed laser to measure ranges & variable distances.
- Working: 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.
- Instrument: LiDAR instrument principally consists of a laser, a scanner, and a specialized GPS receiver. Airplanes and helicopters are the most commonly used platforms for acquiring LiDAR data over broad areas.
- Applications: LiDAR is used for agriculture, hydrology and water management systems, geology-related applications and also in archaeology.