Rigorous Error Modeling for sUAS Acquired Image-Derived Point Clouds

Rodarmel, Craig; Lee, Mark P.; Brodie, Katherine L.; Spore, Nicholas J.; Bruder, Brittany

doi:10.1109/tgrs.2019.2905045

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…In his research, a reliable estimation was achieved by means of experiments and numerical simulations aimed at quantifying a realistic noise level. Driven by progress in hardware condition, signal analysis, and data processing capabilities, TLS has been recently proven as a revolutionary technique for high-accuracy 3D mapping and documentation of physical scenarios [20] and a wide range of other application fields involving 3D modeling [21][22][23][24], topographic analysis [25,26] or digital infrastructures [27,28].…”

Section: Research Backgroundmentioning

confidence: 99%

A New Approach for Cylindrical Steel Structure Deformation Monitoring by Dense Point Clouds

et al. 2021

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As fundamental load-bearing parts, the cylindrical steel structures of transmission towers relate to the stability of the main structures in terms of topological relation and performance. Therefore, the periodic monitoring of a cylindrical steel structure is necessary to maintain the safety and stability of existing structures in energy transmission. Most studies on deformation analysis are still focused on the process of identifying discrepancies in the state of a structure by observing it at different times, yet relative deformation analysis based on the data acquired in single time has not been investigated effectively. In this study, the piecewise cylinder fitting method is presented to fit the point clouds collected at a single time to compute the relative inclination of a cylindrical steel structure. The standard deviation is adopted as a measure to evaluate the degree of structure deformation. Meanwhile, the inclination rate of each section is compared with the conventional method on the basis of the piecewise cylinder fitting parameters. The validity and accuracy of the algorithm are verified by real transmission tower point cloud data. Experimental results show that the piecewise cylinder fitting algorithm proposed in this research can meet the accuracy requirements of cylindrical steel structure deformation analysis and has high application value in the field of structure deformation monitoring.

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Section: Research Backgroundmentioning

confidence: 99%

A New Approach for Cylindrical Steel Structure Deformation Monitoring by Dense Point Clouds

et al. 2021

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“…The mesh models for the two epochs are generated at a similar resolution. While the dense matching uncertainty should be theoretically available for each mesh vertex [23,43], it is computationally demanding and would require massive amounts of memory usage, particularly in the case of the high-resolution models required for coral reef monitoring. A strict solution is offered by the multi-image geometrically constrained least squares matching technique, where not only the matching parameters of all images involved are computed but also simultaneously the object space coordinates, including their standard deviations [44].…”

Section: Level Of Detection or Significance Of Changes In Coral Reef mentioning

confidence: 99%

“…The critical need for accurate and stable reference points for assessing changes in the range of a few centimeters per year for environmental monitoring purposes is stressed, and a thorough analysis of several photographic systems for underwater photogrammetric monitoring of coral reefs is presented. Moreover, moving from previous studies by [22][23][24], we propose a simple and flexible framework to characterize the quality of the derived reef models and to assess the confidence or significance level of the changes detected through time. The method is founded on formal principles of surveying and error propagation theory and is implemented adopting state-of-the-art algorithmic solutions.…”

Section: Introductionmentioning

confidence: 99%

Coral Reef Monitoring by Scuba Divers Using Underwater Photogrammetry and Geodetic Surveying

et al. 2020

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Underwater photogrammetry is increasingly being used by marine ecologists because of its ability to produce accurate, spatially detailed, non-destructive measurements of benthic communities, coupled with affordability and ease of use. However, independent quality control, rigorous imaging system set-up, optimal geometry design and a strict modeling of the imaging process are essential to achieving a high degree of measurable accuracy and resolution. If a proper photogrammetric approach that enables the formal description of the propagation of measurement error and modeling uncertainties is not undertaken, statements regarding the statistical significance of the results are limited. In this paper, we tackle these critical topics, based on the experience gained in the Moorea Island Digital Ecosystem Avatar (IDEA) project, where we have developed a rigorous underwater photogrammetric pipeline for coral reef monitoring and change detection. Here, we discuss the need for a permanent, underwater geodetic network, which serves to define a temporally stable reference datum and a check for the time series of photogrammetrically derived three-dimensional (3D) models of the reef structure. We present a methodology to evaluate the suitability of several underwater camera systems for photogrammetric and multi-temporal monitoring purposes and stress the importance of camera network geometry to minimize the deformations of photogrammetrically derived 3D reef models. Finally, we incorporate the measurement and modeling uncertainties of the full photogrammetric process into a simple and flexible framework for detecting statistically significant changes among a time series of models.

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Coastal boulder movement on a rocky shoreline in northwest Ireland from repeat UAV surveys using Structure from Motion photogrammetry

Knight,

Burningham,

Griffiths

et al. 2023

Geomorphology

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Rigorous Error Modeling for sUAS Acquired Image-Derived Point Clouds

Cited by 6 publications

References 24 publications

A New Approach for Cylindrical Steel Structure Deformation Monitoring by Dense Point Clouds

A New Approach for Cylindrical Steel Structure Deformation Monitoring by Dense Point Clouds

Coral Reef Monitoring by Scuba Divers Using Underwater Photogrammetry and Geodetic Surveying

Coastal boulder movement on a rocky shoreline in northwest Ireland from repeat UAV surveys using Structure from Motion photogrammetry

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