Precision LiDAR Road Survey - Vegetation & Powerline Clearance Analysis

LIDAR works in a similar way to radar or sonar. A beam of light is fired from a sensor and bounces back from whatever hits it. The sensor can then collect information about objects that reflect the beam. The amount of time that it takes for the light to return will determine how far it was from the source. This allows for accurate measurements, which are necessary for gauging severity and estimating required materials and equipment.

LIDAR is a great option for a road survey, as it can be used day or night, and it delivers precise results. It also provides centimeter level accuracy, which can save a significant amount of time. It can also be used to provide accurate height clearance analysis for bridges and overhead powerlines. 

When used for highway and street surveying, the system can be used to produce high-quality 3D models. This can be done by combining the data with the LiDAR360 MLS for feature extractions, like road marks, light poles, road signs and other road infrastructures. It can be produced in several formats, including AutoCAD DXF files and Arc GIS shape files. This allows the engineer to produce a comprehensive road profile, which can be utilized for height clearance analysis and swept-path analysis for over-dimensional load transport. 

While on the construction site, for example in the wind farms, the LiDAR can scan the road, turbine hardstand, and surrounding terrain with centimeter accuracy and georeference coordinates. The data acquired can generate 3D model that can be used for as-built quality control by civil contractor, as well as to get road gradient, horizontal turning radius, crest and sag to allow transport company for transportation feasibility study and selecting the right equipment to bring the wind turbine components to each wind turbine hardstand. 

Furthermore, when compared with previous LiDAR data, it can reveal signs of change in the road’s construction. This information is especially useful when conducting a road survey after a traffic accident or inclement weather events.

Airborne LiDAR can also be used for road surveys. The system can be flown in and out of the field quickly. It can collect information from an entire site in just a few minutes. This can eliminate the need to visit a site more than once, which can save a significant amount of money. It can also be used to create highly accurate terrain models. It can also measure distances, elevations, and other site information.

Regardless of the type of LiDAR that is used, the data that it produces is of great value to both civil and transport engineers. This can help with the planning of projects, as well as the maintenance of existing structures.