Study On Airborne LiDAR Data Processing And Automatic Extraction Of The Sectional View In Highway Design

Airborne laser radar technology can obtain the ground point and the point of thethree-dimensional coordinates of the feature quickly and accurately, and it also combinessatellite positioning, navigation gyro, laser ranging technology. In the survey and design ofhighway, high airborne laser radar technology could obtain topographic informationaccurately compared to other measurements, meanwhile it can be applied to forests,mountains and other features, which have greatly improved the speed and accuracy for thesurvey. Research focused in this paper is carrying out filtering experiment with LiDAR-Suitersoftware, generating Digital Elevation Model from the ground little cloud data obtained byfiltering, and then acquiring the road longitudinal and cross-sectional diagram.The primary works and innovations in this paper are included as follows:1) Describe the surveying measurements required in highway survey, draw the conclusionthat airborne laser radar technology is more suitable for mountain area and forest area bycomparing the traditional ground-based measurements and airborne laser radar technology,which reveals the necessity of the research of airborne radar technology.2) Expound the positioning principle, system components systematically, and express theimplementation of airborne laser radar technology briefly. Compare the advantages anddisadvantages of airborne laser radar, aerial photogrammetry and synthetic aperture radarinterferometry, and describe the main applications of airborne laser radar.3) Expound the airborne LIDAR point cloud data filtering method and filter theexperimental area data with four different kinds of filtering method. Draw the conclusion thatTIN (triangulated irregular network) filtering method has better filtering effect in themountains and plains areas.4) Generate DEM (digital elevation model) and contour lines from point cloud data, andthen mark road centerline by simulating lines-selecting methods. Afterwards, generate theroad longitudinal section view with the software to automatically, and the result turns outgood.