Dedicated Freight Corridor Corporation of India Limited (DFCCIL) will be using Light Detection and Ranging (LiDAR) technique using Laser enabled equipment attached to a Helicopter for carrying out the ground survey for the preparation of the Detailed Project Report (DPR) for the planned 1,115 km East Coast Dedicated Freight Corridor.
This corridor will start from Kharagpur in West Bengal and go through Odisha and end in Vijayawada in Andhra Pradesh. It will connect various cities and towns including Baleshwar, Bhadrak, Bhubaneswar, Visakhapatnam, Nellore, and Vijayawada.
LiDAR (light detection and ranging) technique is a remote sensing technology that uses light in the form of a pulsed laser to measure ranges (distances) to a target. A LiDAR sensor fires off beams of laser light and then measures how long it takes for the light to return to the sensor. When the beam returns, it carries information about the object that it contacted including distance and optical characteristics like reflectivity. It is similar to radar and sonar (that use radio and sound waves). However, it improves greatly on those traditional technologies in terms of the accuracy of sensing.
Advantages of using LiDAR
How the LiDAR Data is Collected?
A typical LiDAR sensor emits pulsed light waves from a laser into the environment. These pulses bounce off surrounding objects and return to the sensor. The sensor uses the time it took for each pulse to return to the sensor to calculate the distance it traveled. Repeating this process millions of times per second creates a real-time 3D map of the environment. An onboard computer can utilize this 3D map of the surrounding environment for navigation.
LiDAR is used in a wide range of land management and planning efforts, including hazard assessment (landslides, tsunamis, and floods), forestry, agriculture, geologic mapping, and watershed and river surveys. The ground survey is a crucial activity for any infrastructure project as the survey provides accurate details of areas around the alignment. LiDAR survey provides all the ground details and data in 2-3 months against the 10-12 months if it is to be done through traditional survey methods.