National High Speed Rail Corporation Ltd. (NHSRCL) has invited tender for Final Alignment design including Aerial LiDAR survey and other related works for Chennai-Mysuru High Speed Rail Corridor (about 435 kms. long). Earlier NHSRCL has invited tenders for the first dedicated preparatory survey work to develop the Detailed Project Report (DPR) for the upcoming 450 km Chennai–Mysuru High Speed Rail Corridor.
The project is to be completed in 150 days from the date of award of work. Estimated department cost is 10.20 crores.
Contractor shall refine the already developed preliminary route based on detailed engineering grade survey using Aerial LiDAR & Imagery, stability considerations, geological consideration, construction consideration, accessibility, safety maintainability, environmental considerations, etc, fixing of permanent control points using GPS survey, levelling survey from Survey of India GTS benchmarks, geo-referencing of revenue maps. Aerial LiDAR Survey shall be complemented by Aerial Imagery in a corridor width of 300 m (150 m on either side) around the proposed alignment.
Lidar is a method which deploys laser light to measure distances and develop 3D projection of the target. The sensor picks up the reflection from the target and the differences in laser return times and wavelengths can then be used to make digital 3-D representations of the target.