Light Detection and Ranging (Lidar) survey is an advanced technological method that involves the use of laser, GPS, and photographic data to conduct detailed surveys of the earth’s surface. This technique has gained significant importance in various fields including archaeology, geology, forestry, and infrastructure development. One of the prominent applications of Lidar survey is in the planning and construction of high-speed rail corridors, where precision and accuracy in data collection are paramount.
Introduction to Lidar Survey
Lidar survey is a remote sensing method that uses light in the form of a pulsed laser to measure variable distances to the Earth. These light pulses—combined with other data recorded by the airborne system—generate precise, three-dimensional information about the shape of the Earth and its surface characteristics. A Lidar instrument principally consists of a laser, a scanner, and a specialized GPS receiver. Airplanes and helicopters are the most commonly used platforms for acquiring Lidar data over broad areas.
The Delhi to Varanasi High-Speed Rail Corridor Project
The National High Speed Rail Corporation Limited (NHSRCL) is adopting the Lidar survey technique for the preparation of the Delhi to Varanasi High-Speed Rail Corridor. This ambitious project aims to significantly reduce travel time between the two cities and enhance connectivity, which is crucial for economic growth and development. By employing Lidar technology, NHSRCL intends to streamline the planning process and ensure that the project’s infrastructure is designed with the utmost precision.
Mounting Equipment on Helicopters for Aerial Surveys
For the purpose of conducting the Lidar survey for the rail corridor, specialized laser-enabled equipment will be mounted on helicopters. These helicopters will then fly over the proposed route, sending millions of laser pulses to the ground every minute. The reflected pulses are captured by the onboard sensors, and this data is used to create a highly accurate topographical map of the terrain below.
Advantages of Aerial Lidar Surveys
Aerial Lidar surveys offer several advantages over traditional land survey methods. Firstly, they provide data with high accuracy and resolution, which is essential for the precise calculation of land requirements, station locations, and structural alignments. Secondly, Lidar surveys can cover large areas quickly, reducing the time needed for data collection. Thirdly, the ability to penetrate vegetation with laser pulses makes it possible to survey ground features in forested or overgrown regions that are otherwise difficult to assess.
Applications of Lidar Data in Rail Corridor Development
The data obtained from the Lidar survey is multifaceted and serves various purposes in rail corridor development. It helps in determining the exact amount of land required for the project, thus aiding in land acquisition processes. The topographical information assists in identifying suitable locations for stations, ensuring they are accessible and strategically placed. Furthermore, the data is instrumental in designing the alignment of the tracks, taking into account the natural contours of the land to minimize construction challenges and environmental impact.
Future of Infrastructure Planning with Lidar Technology
The use of Lidar technology in infrastructure planning, such as the development of high-speed rail corridors, marks a significant advancement in the field. It not only enhances the efficiency and accuracy of the planning process but also contributes to cost savings in the long run by identifying potential issues early on. As the technology continues to evolve, it is expected to become an integral part of more infrastructure projects around the world, paving the way for smarter, more sustainable development.