National High Speed Rail Corporation Limited is to adopt Light Detection and Ranging Survey (LiDAR) technique which uses Laser enabled equipment mounted on a Helicopter for conducting ground survey forthe preparation of Detailed Project Report for the proposed Delhi-Varanasi HSR corridor. LiDAR technique uses a combination of Laser data, GPS data, flight parameters and actual photographs to give accurate survey data as the data is crucial for the linear infrastructure project.

Based on the survey findings, 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 are decided. The Indian railways used the LiDAR technique for the very first time for the Mumbai- Ahmedabad High Speed Rail Corridor primarily because of its high accuracy consumed only 12 weeks which might have taken 10-12 months through traditional survey methods. 

The ground survey using aerial LiDAR technique has already started for the DVHSR corridor. Reference points on the ground have already been marked and data collection through equipment mounted on a Helicopterwill commence from 13th December 2020. Defence ministry permission has already bought and the inspection of the aircraft and equipment are underway. The approximate length of the corridor is about 800 km, the alignment and stations will be decided in consultation with the government. The DVHSR alignment covers mixed terrains including densely populated urban and rural areas, Highways, Roads, Ghats, Rivers, Green fieldsetc, which makes this activity more challenging.  

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