Evaluation of structure from motion for soil microtopography measurement

Nouwakpo, Sayjro K. and James, Michael and Weltz, Mark A. and Huang, Chi-Hua and Chagas, Isis and Lima, Luiz (2014) Evaluation of structure from motion for soil microtopography measurement. The Photogrammetric Record, 147. pp. 297-316. ISSN 0031-868X

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Abstract

Recent developments in low-cost structure-from-motion (SfM) technologies offer new opportunities for geoscientists to acquire high-resolution soil microtopography data at a fraction of the cost of conventional techniques. However, these new methodologies often lack easily accessible error metrics and hence are difficult to evaluate. In this research, a framework was developed to evaluate a SfM approach for soil microtopography measurement through assessment of uncertainty sources and quantification of their potential impact on overall 3D reconstruction. Standard deviations of camera interior orientation parameters estimated from SfM self-calibration within five different soil surface models were several orders of magnitude larger than precisions expected from pattern-based camera calibration. Sensitivity analysis identified the principal point position as the dominant source of calibration-induced uncertainty. Overall, surface elevation values estimated from both technologies were similar in magnitude with a root mean square (RMS) of elevation difference of 0·2 mm. Nevertheless, the presence of deformation in either SfM or traditional photogrammetric point clouds highlights the importance of quality assurance safeguards (such as a judicious choice of control points) in SfM workflows for soil microtopography applications.

Item Type:
Journal Article
Journal or Publication Title:
The Photogrammetric Record
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1700/1706
Subjects:
ID Code:
71445
Deposited By:
Deposited On:
27 Oct 2014 09:36
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Jun 2020 02:45