LiDAR (Light Detection and Ranging) aerial remote sensing method was conducted on a Partenavia P68 series aircraft that took off from Kannur International Airport (KIAL) on December 31st, 2019 was completed on 05.01.2020 in Thiruvananthapuram. The aerial survey was the first vital step before commencing the work of the SilverLine project. The survey has been carried out by Hyderabad-based GeoKno India Pvt. Ltd., which had also conducted the LiDAR survey for the Mumbai-Ahmedabad bullet train project.
This survey helped to identify the alignment very fast, start construction, and equipped K-Rail to prepare the Detailed Project Report (DPR). SilverLine is the second rail project in India to rely on the LiDAR survey. The land that has a width of 600 m is being surveyed for SilverLine, and the line will be set up in the suitable 25 m width land. The ground points for this have already been set up. The LiDAR eye can detect things ranging from buildings, people inhabited areas, forests, and bridges to stone benches and bushes, enabling the completion of the alignment by avoiding things that are beneficial for people.
LiDAR survey is conducted using the reflection of laser rays. The equipment in the aircraft will have a laser unit, scanner, and GPS receiver. The laser rays will scan the surface of the earth and the returning rays are received by the sensor to map the route. Through the survey, accurate details of the land will be available without disturbing public life. Moreover, it can precisely identify forests, rivers, roads, wetlands, buildings, electricity lines, and heritage zones. The high-resolution cameras used in the LiDAR unit can also detect tree-covered low lands.