An on-site approach for the self-calibration of terrestrial laser scanner

Abbas, Mohamed Yusoff; Lichti, Derek D.; Chong, Albert K.; Setan, Halim; Majid, Zulkepli

doi:10.1016/j.measurement.2014.03.009

Cited by 39 publications

(24 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Again, the exact limits may be lower. These angle definitions follow those reported in (Abbas et al, 2014;García-San-Miguel and Lerma, 2013;Lichti, 2007). Other formulations are also reported (Medić et al, 2017;Muralikrishnan et al, 2015;Reshetyuk, 2010).…”

Section: Angular Observation Modelsmentioning

confidence: 75%

Explanation for the seam line discontinuity in terrestrial laser scanner point clouds

Lichti

Glennie

Al-Durgham

et al. 2019

ISPRS Journal of Photogrammetry and Remote Sensing

View full text Add to dashboard Cite

The so-called seam line discontinuity is a phenomenon that can be observed in point clouds captured with some panoramic terrestrial laser scanners. It is an angular discontinuity that is most apparent where the lower limit of the instrument's angular field-of-view intersects the ground. It appears as step discontinuities at the start (0° horizontal direction) and end (180°) of scanning. To the authors' best knowledge, its cause and its impact, if any, on point cloud accuracy have not yet been reported. This paper presents the results of a rigorous investigation into several hypothesized causes of this phenomenon: differences between the lower and upper elevation angle scanning limits; the presence of a vertical circle index error; and changes in levelling during scanning. New models for the angular observations have been developed and simulations were performed to independently study the impact of each hypothesized cause and to guide the analyses of real datasets. In order to scrutinize each of the hypothesized causes, experiments were conducted with seven real datasets captured with six different instruments: one hybrid-architecture scanner and five panoramic scanners, one of which was also operated as a hybrid instrument. This study concludes that the difference between the elevation angle scanning limits is the source of the seam line discontinuity phenomenon. Accuracy assessment experiments over real data captured in an indoor test facility demonstrate that the seam line discontinuity has no metric impact on the point clouds.

show abstract

Section: Angular Observation Modelsmentioning

confidence: 75%

Explanation for the seam line discontinuity in terrestrial laser scanner point clouds

Lichti

Glennie

Al-Durgham

et al. 2019

ISPRS Journal of Photogrammetry and Remote Sensing

View full text Add to dashboard Cite

show abstract

“…Vertical beam tilt ** x 6 Mirror tilt x 7 Horizontal axis error (tilt) x 10 Rangefinder offset * * CPs not sensitive to two-face measurements. ** CPs partially sensitive to two-face measurements.…”

Section: Cp Description X 1nmentioning

confidence: 99%

“…To that end, multiple self-calibration approaches have been developed, assuring up-to-date calibration parameters (CPs) and successfully reducing the measurement uncertainty without requiring instruments of higher accuracy [3]. These approaches rely on different objects as calibration references, such as planes [4,5], cylinders [6], paraboloids [7], signalized target points [8][9][10][11][12][13][14], or automatically detected salient points [15,16], which are found or deliberately placed in the surroundings.…”

Section: Introductionmentioning

confidence: 99%

“…Current implementations of the calibration fields for target-based calibration use high quantities of well-distributed targets, and they rely on this heavy redundancy to assure accurate and unbiased estimation of CPs. As a result, they lack efficiency due to complex calibration field assembly and long measurement acquisition and processing time, which was recognized as the main disadvantage of this approach in many instances [3,5,6,10,[22][23][24][25][26]. This drawback hinders this approach to be well accepted as a standard user-oriented TLS calibration method.…”

Section: Introductionmentioning

confidence: 99%

“…For comparison, a current typical calibration field consists of 120 well-distributed targets [3]. It should be noted that a few studies have already addressed the problem of calibration efficiency by reducing the number of targets [10,27]. However, they focused on estimating only a smaller subset of the CPs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Designing and Evaluating a User-Oriented Calibration Field for the Target-Based Self-Calibration of Panoramic Terrestrial Laser Scanners

2019

View full text Add to dashboard Cite

Calibration of terrestrial laser scanners (TLSs) is one of the fundamental tasks for assuring the high measurement accuracy required by an increasing number of end-users. Nevertheless, the development of user-oriented calibration approaches is still an active topic of research. The calibration fields for the target-based self-calibration of TLSs described in the literature are based on the quasi-random distribution of a high number of targets, and they rely on heavy redundancy. This redundancy assures highly accurate calibration results, however, with the price of reduced efficiency. In contrast, this work follows the design, implementation, and validation of a user-oriented, cost-efficient calibration field intended for TLS calibration prior to measurement campaigns. Multiple goals and constraints are placed upon the design of the calibration field, such as comprehensive calibration for high-end panoramic TLSs considering all relevant mechanical misalignments, delivering stable and reusable calibration parameters, increasing calibration efficiency by minimizing calibration-field assembly, measurement acquisition and processing time through reducing the number of targets and scanner stations, as well as estimating calibration parameters with predefined quality criteria. The calibration field design was derived through a series of simulation experiments and it was compared with the current state of the art. The simulations indicate comparable calibration results, with eight times smaller number of targets (14 instead of 120). The implemented calibration field was tested on a range of instruments, successfully improving the measurement quality, both in situ and in the subsequent applications.

show abstract

Terrestrial Laser Scanners Self-calibration Study: Datum Constraints Analyses for Network Configurations

Abbas

Setan

Majid

et al. 2016

Advances in 3D Geoinformation

View full text Add to dashboard Cite

An on-site approach for the self-calibration of terrestrial laser scanner

Cited by 39 publications

References 14 publications

Explanation for the seam line discontinuity in terrestrial laser scanner point clouds

Explanation for the seam line discontinuity in terrestrial laser scanner point clouds

Designing and Evaluating a User-Oriented Calibration Field for the Target-Based Self-Calibration of Panoramic Terrestrial Laser Scanners

Terrestrial Laser Scanners Self-calibration Study: Datum Constraints Analyses for Network Configurations

Contact Info

Product

Resources

About