High Speed Rail work gathers momentum. With the start of LiDAR (Aerial Ground) Survey today, High Speed Rail work gathered momentum for Delhi – Varanasi High Speed Rail Corridor. LiDAR survey for Delhi-Varanasi High Speed Rail Corridor started today 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. This technique uses a combination of Laser data, GPS data, flight parameters and actual photographs to give accurate survey data.
During the Aerial LiDAR survey, 300 mtrs (150 mtrs on either side) of area around the proposed alignment is being captured for the survey purpose. After the collection of data, Three Dimensional (3D) Topographical map of 50 mtrs corridor on either side of the proposed alignment on a scale of 1:2500 will be available for designing of the vertical & horizontal alignment, structures, location of the stations and depots, Land requirement for the corridor, identification of project affected plots/structures, Right of Way etc.
As per the nine (9) standard benchmarks set by the Survey of India in this field, 86 master control points and 350 secondary control points have been established and these coordinates are being used for flying the aircraft on Delhi-Varanasi HSR corridor alignment. To provide clear pictures of the structures, trees and other minute ground details,60megapixel cameras are being used for the LiDAR survey. NHSRCL has been entrusted to prepare the Detailed Project Reports for seven (7) High Speed Rail Corridors and LiDAR survey technique will be used for ground survey in all the corridors.