Error Analysis and Accuracy Assessment of Mobile Laser Scanning System

ABSTRACT

Mobile Laser Scanning System (MLS) is integrated with GNSS, IMU, Laser Scanner and Digital Cameras, and other sensors taking vehicle as a carrier. It can quickly obtain spatial location and attribute information on both sides of roads. With the rapid development of mobile mapping technology, there is a great variety of MLSs. Therefore, how to evaluate the performance of these systems is getting more and more attention. In this paper, the error factors affecting the accuracy of MLS were analyzed. Based on these analyses, the accuracy assessment methods were proposed for three sensors and the system. The known baseline value was used to assess static positioning accuracy of GNSS, GT580 was used to assess attitude accuracy of IMU, total station was adopted to assess distance accuracy of Laser Scanner, and multi-tooth dividing table was used to assess angle measurement of Laser Scanner. Testing field was used to assess the plane and elevation accuracy of the system. The experiments show that the methods proposed in this paper are feasible even for cmlevel high precision of MLS. Therefore the research has practical significance and reference value.

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