▁under se a ▁tunnel ▁stretch . ▁ ▁Railway ▁officials ▁util ized ▁a ▁hel ic opter ▁mounted ▁with ▁a ▁ 1 0 0 - m eg ap ixel ▁high - resol ution ▁digital ▁camera , ▁a ▁Light ▁D ete ction ▁and ▁R anging ▁( Li D AR ) ▁sc anner , ▁a ▁data ▁rec order ▁and ▁other ▁equipment ▁to ▁carry ▁out ▁the ▁survey . ▁This ▁aer ial - sur vey ▁method ▁provides ▁accurate ▁data ▁about ▁land ▁cont ours , ▁buildings ▁and ▁veget ation , ▁and ▁will ▁permit ▁the ▁survey ▁work ▁to ▁be ▁completed ▁within ▁ 9 – 1 0 ▁weeks ▁as ▁opposed ▁to ▁the ▁ 6 – 8 ▁months ▁required ▁for ▁a ▁regular ▁survey . ▁The ▁hel ic opter ▁completed ▁its ▁survey ▁of ▁the ▁entire ▁route ▁within ▁a ▁flying ▁time ▁of ▁ 3 0 ▁hours , ▁and ▁the ▁rest ▁of ▁the ▁time ▁is ▁required ▁for ▁data ▁processing . ▁The ▁aer ial ▁survey ▁was ▁completed ▁by ▁J IC A ▁and ▁the ▁Indian ▁Rail ways ▁by ▁the ▁end ▁of ▁February ▁ 2 0 1 7 . ▁Railway ▁Ministry ▁officials ▁stated ▁in ▁April ▁ 2 0 1 7 ▁that ▁final ▁location ▁surve ys ▁had ▁been ▁completed , ▁and ▁that ▁consult ants ▁to ▁carry ▁out ▁environmental ▁and ▁social ▁impact ▁studies ▁would ▁be ▁appointed ▁within ▁a ▁few ▁months . ▁ ▁Indian ▁Prime ▁Minister ▁Nar endra ▁Mod i ▁and ▁Japanese ▁Prime ▁Minister ▁Shin zo ▁A be ▁laid ▁the ▁foundation ▁stone ▁for ▁the ▁project ▁in ▁Ah med abad ▁on ▁ 1 4 ▁September ▁ 2 0 1 7 . ▁All ▁ge