Data collection for the ground survey of Delhi-Varanasi high speed rail corridor will commence on December 13,2020 according to National High Speed Rail Corporation Limited (NHSRCL).
NHSRCL will use the LiDAR (Light detection and ranging survey) technique for the ground survey which will be used for preparing the detailed project report (DPR) of Delhi-Varanasi HSR corridor, NHSRCL said in a statement.
The ground survey using aerial LiDAR technique has already started. Reference points on the ground have been marked. Data collection for ground survey using laser enabled equipment mounted on a helicopter will start on December 13, depending on weather conditions, the statement said.
The requisite flying permissions from the Ministry of Defence have been received and the inspection of the aircraft and equipment are underway, the statement added.
DPR for Delhi-Varanasi HSR
Indian Railways has given the DPR preparation mandate of Delhi-Varanasi HSR Corridor to NHSRCL. The tentative length of Delhi-Varanasi HSR is about 800 km long.It will pass through Noida, Agra,Kanpur and Lucknow onwards to Varanasi. It covers mixed terrain which includes densely populated urban and rural areas, highways, roads, ghats, rivers and green agricultural land. The alignment and stations will be decided in consultation with the government.
Ground Survey -How it is done
The alignment or ground survey is a crucial activity for any infrastructure project as it 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.
Based on the findings,the survey, designing of the vertical and horizontal alignment, structures, location of the stations and depots, land requirement for the corridor, identification of project affected plots/structures, right of way are decided.
[The highly accurate LiDAR technique significantly reduces the time taken to survey any alignment vis-a-vis the traditional methods. The first ever ground survey using aerial LiDAR was done for Mumbai -Ahmedabad high speed railway alignment in 12 weeks as against the 10-12 months required for traditional techniques.]