LiDAR, which stands for Light Detection and Ranging, is a remote sensing method that uses light in the form of a pulsed laser to measure ranges (variable distances). The data obtained by the system is a collection of three-dimensional laser reflection point clouds from the surveyed object on the ground. A typical LiDAR system is permanently mounted on a suitable aircraft. When the airplane flies over the area to be surveyed, the laser sensor sends laser beams at the object, and the laser signal receiver attached to the sensor receives the signal reflected by the object. Every second, the system can receive hundreds of thousands to millions of LiDAR points. Then, this LiDAR point cloud is preprocessed using specialist software.
Lidar technology for high-precision digital terrain modeling (DTM) and (3D) spatial mapping is a breakthrough in the application of sophisticated technology to produce high-quality and accurate products to meet the present requirements and tasks of economic development, security, and defense.
Topographic mapping is incredibly crucial for ensuring the proper design of traffic projects. Topographic surveying and mapping rely heavily on popular measurement technologies such as GNSS satellite receivers, electronic total stations, theodolites, and levelling machines in actual production today. Using the traditional method of measurement, surveying and mapping the topography will require considerable effort and time, particularly in mountainous, dangerous, and tough terrain locations. With the terrain being narrow and stretching tens to hundreds of kilometers, the utilization of UAV technology equipped with LiDAR will assure the required progress and precision.
LiDAR technology enables us to map the landscape rapidly, precisely, and with a sufficient bandwidth in a short amount of time, which traditional methods do not permit due to their high cost and tight timetable. This provides the design engineer with multiple options in the overview from which to select the ideal alignment for the project and the most persuasive presentation to stakeholders, etc.
TEDI has obtained specific outcomes with Phantom 3 Professional, Phantom 4 Professional, and Phantom 4 RTK shooting drones through research and experimentation. Since 2016, TEDI has utilized UAV/DRONE technology for topographic surveying on the following projects: intersection systems in Hanoi; Van Don-Mong Cai expressway, Cho Moi-Bac Kan expressway, Mu Da-Vung Ang railway, East North-South expressway component projects in periods of 2017-2020, 2021-2025, and ring roads 3 and 4 in Ho Chi Minh City and Hanoi, etc.
Evaluating the efficiency of modern technology in surveying, contributing to ensuring progress, improving the quality of survey and design for traffic works performed by TEDI, and moving towards the 4.0 era, with rapid access to new technologies for BIM application in design and project management that TEDI is implementing, TEDI is the only transport consulting firm that continues to invest in next-generation LiDAR for digital topographic modeling (DTM) and spatial mapping (3D).
TEDI Basic Data Center engineers and technicians swiftly grasp new technology and implement it in the following projects: Khanh Hoa-Buon Ma Thuot Expressway, material mines for the North-South Expressway between 2021 and 2025, Ky Thuong-Cua Luc, Dau Giay-Tan Phu, Bao Loc-Lien Phu Roads, etc.
