Terrestrial Laser Scanners Datum Transformation: Insignificant Analysis of Scale Factor

Authors

  • Mohd Azwan Abbas Universiti Teknologi MARA
  • Zulkepli Majid Universiti Teknologi Malaysia
  • Mohamad Aizat Asyraff Mohamad Azmi Universiti Teknologi MARA
  • Albert K. Chong University of Southern Queensland
  • Mohamad Asrul Mustafar Universiti Teknologi MARA
  • Lau Chong Luh Universiti Teknologi Malaysia
  • Anuar Aspuri Universiti Teknologi Malaysia

DOI:

https://doi.org/10.4186/ej.2021.25.1.253

Keywords:

terrestrial laser scanner, datum transformation, scale factor, network configuration, significant analysis

Abstract

Due to the measurement mechanism employed by terrestrial laser scanners (TLSs), the pre-processing procedure has become crucial procedure to orient all acquired data into global or ground coordinate system. Rather than utilising all seven-transformation parameters, most of TLS practitioners have neglected the scale factor. Taking into account the uncertainties in deriving range data, neglecting the scale factor in datum transformation computation could jeopardise the quality of pre-processed results. To rigorously examine this argument, two experiments have been designed by considering the element of multi distances and multi sensors. Utilising phase (i.e. Faro Focus 3D) and pulse-based (i.e. Leica ScanStation C10) scanners, both experiments were carried out with computation of seven (7) transformation parameters and scale factors were extracted for the assessment. With the aid of statistical analysis, the computed scale factors were mathematically differentiate to the ideal value (i.e. 1.000 or no scale effect). Under 95% confidence level, the null hypotheses for both experiments have indicate an agreement that scale factor can be neglected in datum transformation process for both types of terrestrial laser scanners.

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Author Biographies

Mohd Azwan Abbas

Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

Centre of Studies for Surveying Science & Geomatics, Universiti Teknologi MARA Perlis Branch, Arau Campus, 02600 Arau, Perlis, Malaysia

Zulkepli Majid

Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, 81310 Skudai, Malaysia

Mohamad Aizat Asyraff Mohamad Azmi

Centre of Studies for Surveying Science & Geomatics, Universiti Teknologi MARA Perlis Branch, Arau Campus, 02600 Arau, Perlis, Malaysia

Albert K. Chong

School of Civil Engineering & Surveying, University of Southern Queensland, Australia

Mohamad Asrul Mustafar

Centre of Studies for Surveying Science & Geomatics, Universiti Teknologi MARA Perlis Branch, Arau Campus, 02600 Arau, Perlis, Malaysia

Lau Chong Luh

Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, 81310 Skudai, Malaysia

Anuar Aspuri

Faculty of Built Environment & Surveying, Universiti Teknologi Malaysia, 81310 Skudai, Malaysia

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Published In
Vol 25 No 1, Jan 31, 2021
How to Cite
[1]
M. A. Abbas, “Terrestrial Laser Scanners Datum Transformation: Insignificant Analysis of Scale Factor”, Eng. J., vol. 25, no. 1, pp. 253-262, Jan. 2021.

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