LiDAR (Aerial Ground) Survey for Delhi

• With the start of LiDAR (Aerial Ground) Survey, High Speed Rail work gathered momentum for Delhi – Varanasi High Speed Rail Corridor.


• The LiDAR survey for Delhi-Varanasi High Speed Rail Corridor started from Greater NOIDA where a Helicopter fitted with state of art Aerial LiDAR and Imagery sensors took the first flight and captured the data related to ground survey.

• National High Speed Rail Corporation Limited is adopting Light Detection and Ranging Survey (LiDAR) technology which provides all the ground details and data in 3-4 months wherein this process normally takes 10-12 months.

• The ground survey is a crucial activity for any linear infrastructure project as the survey provides accurate details of areas around the alignment.


• Lidar, which stands for Light Detection and Ranging, 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.

• A lidar instrument principally consists of a laser, a scanner, and a specialized GPS receiver.


Mains Paper 3: Science and Tech

Prelims level: LiDAR (Aerial Ground) Survey

Mains level: Key highlights of the survey

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