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Design and Evaluation of a Permanently Installed Plane-Based Calibration Field for Mobile Laser Scanning Systems

DOI:10.3390/rs12030555 期刊:Remote Sensing 出版年份:2020 更新时间:2025-09-23 15:19:57
摘要: Mobile laser scanning has become an established measuring technique that is used for many applications in the fields of mapping, inventory, and monitoring. Due to the increasing operationality of such systems, quality control w.r.t. calibration and evaluation of the systems becomes more and more important and is subject to on-going research. This paper contributes to this topic by using tools from geodetic configuration analysis in order to design and evaluate a plane-based calibration field for determining the lever arm and boresight angles of a 2D laser scanner w.r.t. a GNSS/IMU unit (Global Navigation Satellite System, Inertial Measurement Unit). In this regard, the impact of random, systematic, and gross observation errors on the calibration is analyzed leading to a plane setup that provides accurate and controlled calibration parameters. The designed plane setup is realized in the form of a permanently installed calibration field. The applicability of the calibration field is tested with a real mobile laser scanning system by frequently repeating the calibration. Empirical standard deviations of <1 ... 1.5 mm for the lever arm and <0.005? for the boresight angles are obtained, which was priorly defined to be the goal of the calibration. In order to independently evaluate the mobile laser scanning system after calibration, an evaluation environment is realized consisting of a network of control points as well as TLS (Terrestrial Laser Scanning) reference point clouds. Based on the control points, both the horizontal and vertical accuracy of the system is found to be < 10 mm (root mean square error). This is confirmed by comparisons to the TLS reference point clouds indicating a well calibrated system. Both the calibration field and the evaluation environment are permanently installed and can be used for arbitrary mobile laser scanning systems.
作者: Erik Heinz,Christoph Holst,Heiner Kuhlmann,Lasse Klingbeil
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Designing and evaluating a plane-based calibration field for determining the lever arm and boresight angles of a 2D laser scanner w.r.t. a GNSS/IMU unit on a mobile platform, and establishing an evaluation environment for mobile laser scanning systems.

The paper concludes that the designed plane-based calibration field provides accurate and controlled calibration parameters for mobile laser scanning systems. The evaluation environment, consisting of a network of control points and TLS reference point clouds, allows for effective empirical evaluation of the systems. The study demonstrates that the accuracy of the mobile laser scanning system can be specified with an RMS of <10 mm for the east, north, and height components under the measuring conditions in the evaluation environment.

The study acknowledges the complexity and partially unknown processing chain of mobile laser scanning systems, which makes rigorous modeling of system accuracy challenging. The evaluation environment's effectiveness is dependent on the structure of the measured object, and certain errors may not be detectable in all scenarios.

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