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The reproducibility of SfM algorithms to produce detailed Digital Surface Models : the example of PhotoScan applied to a high-alpine rock glacier

(2019) REMOTE SENSING LETTERS. 10(1). p.11-20
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Abstract
In geomorphology, PhotoScan is a software that is used to produce Digital Surface Models (DSMs). It constructs 3D environments from 2D imagery (often taken by Unmanned Aerial Vehicles (UAV)) based on Structure-from-Motion (SfM) and Multi-View Stereo (MVS) principles. However, unpublished computer-vision algorithms used, contain random elements which can affect the accuracy of the outputs. For this letter, ten model runs with identical inputs were performed on UAV imagery of a rock glacier to analyse the magnitude of the variation between the different model outputs. This variation was quantified calculating the standard deviation of each cell value in the respective DSMs and derivatives (curvature). Places with steep slope gradients have considerably more DSM variation (up to 10 cm) but stay within the range of the model's accuracy (10 vertical cm) for 88 - 96% of the area. The edges of the model also show a larger variability (0.10 - 3 m), related to a lower number of overlapping images. These results should be accounted for when performing a geomorphological research at centimetre scale using PhotoScan, especially in areas with a complex relief. Using medium-quality runs, additional oblique viewpoints and respecting a minimum of five overlapping images can minimize the software's variations.
Keywords
STRUCTURE-FROM-MOTION, MULTIVIEW STEREOPSIS, GROUND CONTROL, PHOTOGRAMMETRY, UAV, TOPOGRAPHY, MORPHOLOGY, ACCURACY, SCALE, 3D

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Chicago
Hendrickx, Hanne, Sebastián Vivero, Laure De Cock, Bart De Wit, Philippe De Maeyer, Christophe Lambiel, Reynald Delaloye, Jan Nyssen, and Amaury Frankl. 2019. “The Reproducibility of SfM Algorithms to Produce Detailed Digital Surface Models : the Example of PhotoScan Applied to a High-alpine Rock Glacier.” Remote Sensing Letters 10 (1): 11–20.
APA
Hendrickx, Hanne, Vivero, S., De Cock, L., De Wit, B., De Maeyer, P., Lambiel, C., Delaloye, R., et al. (2019). The reproducibility of SfM algorithms to produce detailed Digital Surface Models : the example of PhotoScan applied to a high-alpine rock glacier. REMOTE SENSING LETTERS, 10(1), 11–20.
Vancouver
1.
Hendrickx H, Vivero S, De Cock L, De Wit B, De Maeyer P, Lambiel C, et al. The reproducibility of SfM algorithms to produce detailed Digital Surface Models : the example of PhotoScan applied to a high-alpine rock glacier. REMOTE SENSING LETTERS. 2019;10(1):11–20.
MLA
Hendrickx, Hanne, Sebastián Vivero, Laure De Cock, et al. “The Reproducibility of SfM Algorithms to Produce Detailed Digital Surface Models : the Example of PhotoScan Applied to a High-alpine Rock Glacier.” REMOTE SENSING LETTERS 10.1 (2019): 11–20. Print.
@article{8578350,
  abstract     = {In geomorphology, PhotoScan is a software that is used to produce Digital Surface Models (DSMs). It constructs 3D environments from 2D imagery (often taken by Unmanned Aerial Vehicles (UAV)) based on Structure-from-Motion (SfM) and Multi-View Stereo (MVS) principles. However, unpublished computer-vision algorithms used, contain random elements which can affect the accuracy of the outputs. For this letter, ten model runs with identical inputs were performed on UAV imagery of a rock glacier to analyse the magnitude of the variation between the different model outputs. This variation was quantified calculating the standard deviation of each cell value in the respective DSMs and derivatives (curvature). Places with steep slope gradients have considerably more DSM variation (up to 10 cm) but stay within the range of the model's accuracy (10 vertical cm) for 88 - 96\% of the area. The edges of the model also show a larger variability (0.10 - 3 m), related to a lower number of overlapping images. These results should be accounted for when performing a geomorphological research at centimetre scale using PhotoScan, especially in areas with a complex relief. Using medium-quality runs, additional oblique viewpoints and respecting a minimum of five overlapping images can minimize the software's variations.},
  author       = {Hendrickx, Hanne and Vivero, Sebasti{\'a}n and De Cock, Laure and De Wit, Bart and De Maeyer, Philippe and Lambiel, Christophe and Delaloye, Reynald and Nyssen, Jan and Frankl, Amaury},
  issn         = {2150-704X},
  journal      = {REMOTE SENSING LETTERS},
  language     = {eng},
  number       = {1},
  pages        = {11--20},
  title        = {The reproducibility of SfM algorithms to produce detailed Digital Surface Models : the example of PhotoScan applied to a high-alpine rock glacier},
  url          = {http://dx.doi.org/10.1080/2150704X.2018.1519641},
  volume       = {10},
  year         = {2019},
}

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