期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2004
卷号：XXXVI-8/W2
出版社：Copernicus Publications
摘要：Laser scanners are used more and more as surveying instruments for various applications in traffic construction analysis. Especially tunnels and road conditions are relevant to offer a continuous monitoring. As traffic is increasing steadily the infrastructure has to be in proper conditions. With traffic and transported goods increasing, detailed information of the network (clearance of bridges and tunnels, rut etc.) has to be monitored. With laser scanner systems, capable of working in most real world environments under a variety of conditions, numerous applications have opened up. State-of-the-art, high precision, high speed laser scanners provide accurate visual and geometric measurements. To realise surveying tasks for traffic construction analysis, point clouds, measured by the laser scanner, are transformed into three dimensional models, describing the environment geometrically. In addition, the visual information of the data measured is used to determine surface conditions of the objects, indicating possibilities of cracks and other damages in the structure itself. Geometric constraints like planes, cylinders or meshing techniques may be adapted resulting on a CAD model, representing the existing environment. This paper reports applications of the laser scanner IMAGER 5003 with highway bridge clearance measurements. It focuses on the accuracy of the system and reports the realised approach from physical measurement to "as built" models in the end. It shows the process from measurement of highway bridges by scanning over determining the condition in terms of the height of the bridge to a surface analysis, all relative to the road surface and an initial coordinate system
关键词：Laser scanning; surveying; construction; monitoring; 3D reconstruction; virtual reality
