Volume XLII-2/W7
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W7, 699-702, 2017
https://doi.org/10.5194/isprs-archives-XLII-2-W7-699-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-2/W7, 699-702, 2017
https://doi.org/10.5194/isprs-archives-XLII-2-W7-699-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Sep 2017

13 Sep 2017

MODELING MAIN BODY OF OVERCROSSING BRIDGE BASED ON VEHICLE-BORNE LASER SCANNING DATA

X. Chen1,2, M. Chen3, Z. Wei1,2, and R. Zhong1 X. Chen et al.
  • 1Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing 100048, China
  • 2Chinese Academy of Surveying and Mapping, Beijing 100830, China
  • 3Beijing Pake International Engineering Consulting Co.Ltd., Beijing 100022, China

Keywords: VBLS, point cloud, virtual path, line extraction, line segments cluster, overcrossing bridge modelling

Abstract. Vehicle-borne laser scanning (VBLS) is widely used to collect urban data for various mapping and modelling systems. This paper proposes a strategy of feature extraction and 3d model reconstruction for main body of overcrossing bridges based on VBLS point clouds. As the bridges usually have a large span, and the clouds data is often affected by obstacles, we have to use round-trip cloud data to avoid missing part. To begin with, pick out the cloud of the bridge body by an interactive clip-box, and group points by scan-line, then sort the points by scanning angle on each scan line. Since the position under the vehicle have a fixed scan-angle, a virtual path can be obtained. Secondly, extract horizontal line segments perpendicular to the virtual path along adjacent scan-lines, and then cluster line segments into long line-strings, which represent the top and bottom edge. Finally, regularize the line-strings and build 3d surface model of the bridge body. Experimental studies have demonstrated its efficiency and accuracy in case of building bridge model. Modelling the stairs at the both end of the bridge will be the direction of the next step.