Abstract
The calibration and accuracy analysis of a novel, low-cost, adaptable mobile laser scanning (MLS) system using a Velodyne HDL-32E laser scanner and an Oxford Technical Solutions Inertial+2 inertial navigation system, is described. First, a static calibration of the laser scanner is discussed. The static calibration is shown to improve the overall relative accuracy of point cloud data from the scanner by approximately 20% over the manufacturer-supplied calibration. Then, the determination of system boresight angles and lever-arm offsets using a planar patch least-squares approach is presented. Finally, the calibrated and boresighted MLS is operated in a backpack mode to acquire multiple data sets in an area that contains dense ground control acquired using static terrestrial laser scanning (TLS) and a high-end, survey-grade MLS. The dense ground control is used to examine several methods of estimating the overall errors of the backpack MLS system. Detailed comparison of the MLS data with the TLS and survey-grade MLS control shows that, despite the system’s low cost, it is able to reliably collect point cloud data with greater than 10-cm three-dimensional root-mean-square error accuracy.
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Acknowledgments
Support, through a research assistantship from the National Center for Airborne Laser Mapping (NCALM), through a grant from the National Science Foundation’s (NSF) Division of Earth Sciences, Instrumentation and Facilities Program (EAR 1043051), and a teaching assistantship from the Cullen College of Engineering at the University of Houston, for the first author, are acknowledged. The second author was partially supported by a research grant from the Gulf of Mexico Research Initiative (GoMRI). The purchase and development of the mapping-grade mobile laser scanning system was funded by the Public Interest Energy Research (PIER) program of the California Energy Commission (Grant 500-09-035) to the School of Ocean and Earth Sciences and Technology at the University of Hawaii.
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© 2016 American Society of Civil Engineers.
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Received: Oct 9, 2015
Accepted: Dec 10, 2015
Published online: Feb 10, 2016
Discussion open until: Jul 10, 2016
Published in print: Nov 1, 2016
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