In situ growth rates of deep-water octocorals determined from 3D photogrammetric reconstructions

Bennecke, Swaantje; Kwasnitschka, Tom; Meta×as, Anna; Dullo, Wolf‐Christian

doi:10.1007/s00338-016-1471-7

Cited by 37 publications

(34 citation statements)

References 41 publications

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“…Comparably, structure from motion has low error margins relative to 'true' volume and surface area [12], yet allows in situ assessments of bommie volume and surface area (and presumably rugosity). The most similar study to ours is likely that of Bennecke et al [13], which outlined potential error of up to 28% over eight years that resulted from the use of different or lower-quality cameras on measurements, or from inconsistent reference points. Since our study accounts for those two sources of error by having consistent reference points and cameras, our error estimations of up to 15% are more indicative of the optimal precision of structure from motion for these applications.…”

Section: Discussionsupporting

confidence: 62%

“…This is the first study to quantify measurement errors associated with the entire process of structure from motion in coral reef applications. Previous studies have used structure from motion techniques to obtain measurement data from coral reefs [12,36,37], and while some studies have quantified measurement error in relation to 'true volume/surface area' as determined by laser scanning or traditional methods [10,13], no attempt to verify whether the measurements obtained using structure from motion were reproducible until now. Volume and surface area are basic measurements, and the implications of this study should also apply to studies that assess rugosity or other structural characteristics using this technique [9,11,50].…”

Section: Discussionmentioning

confidence: 99%

“…Structure from motion is an image processing technique that allows construction of accurate 3D models from overlapping successive photographs taken at various angles. While studies have quantified measurement errors that arise from using this technique compared to 'true' volume and surface area [12][13][14] or rugosity [10,14], no study has determined error margins for measurements obtained over time and across different observers. Moreover, no research has attempted to measure the volume and surface area of an ecologically-relevant reef feature often used in reef monitoring, the coral bommie [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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How Reliable Is Structure from Motion (SfM) over Time and between Observers? A Case Study Using Coral Reef Bommies

et al. 2017

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Recent efforts to monitor the health of coral reefs have highlighted the benefits of using structure from motion-based assessments, and despite increasing use of this technique in ecology and geomorphology, no study has attempted to quantify the precision of this technique over time and across different observers. This study determined whether 3D models of an ecologically relevant reef structure, the coral bommie, could be constructed using structure from motion and be reliably used to measure bommie volume and surface area between different observers and over time. We also determined whether the number of images used to construct a model had an impact on the final measurements. Three dimensional models were constructed of over twenty coral bommies from Heron Island, a coral cay at the southern end of the Great Barrier Reef. This study did not detect any significant observer effect, and there were no significant differences in measurements over four sampling days. The mean measurement error across all bommies and between observers was 15 ± 2% for volume measurements and 12 ± 1% for surface area measurements. There was no relationship between the number of pictures taken for a reconstruction and the measurements from that model, however, more photographs were necessary to be able to reconstruct complete coral bommies larger than 1 m 3 . These results suggest that structure from motion is a viable tool for ongoing monitoring of ecologically-significant coral reefs, especially to establish effects of disturbances, provided the measurement error is considered.

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Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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How Reliable Is Structure from Motion (SfM) over Time and between Observers? A Case Study Using Coral Reef Bommies

et al. 2017

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“…Indeed, photogrammetry is becoming a common tool that a scientific team can use by themselves. We can see for example the work of John Burn using photogrammetry in relationship with GIS software (Burns et al, 2015a), (Burns et al, 2015b), (Burns et al, 2016), (Figueira et al, 2015), as well (Bennecke et al, 2016) about deep coral surveys.…”

Section: Previous Workmentioning

confidence: 99%

Underwater Photogrammetry, Coded Target and Plenoptic Technology: A Set of Tools for Monitoring Red Coral In Mediterranean Sea in the Framework of the ”perfect” Project

Drap¹,

Royer²,

Nawaf³

et al. 2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:PErfECT 'Photogrammetry, gEnetic, Ecology for red coral ConservaTion' is a project leaded by the Laboratoire des Sciences de lInformation et des Systmes (LSIS -UMR 7296 CNRS) from the Aix-Marseille University (France) in collaboration with the Spanish National Agency for Scientific Research (CSIC, Spain). The main objective of the project is to develop innovative Tools for the conservation of the Mediterranean red coral, Corallium rubrum. PErfECT was funded by the Total Fundation. The adaptation of digital photogrammetric techniques for use in submarine is rapidly increasing in recent years. In fact, these techniques are particularly well suited for use in underwater environments. PErfECT developed different photogrammetry tools to enhance the red coral population surveys based in: (i) automatic orientation on coded quadrats, (ii) use of NPR (Non Photo realistic Rendering) techniques, (iii) the calculation of distances between colonies within local populations and finally (iv) the use of plenoptic approaches in underwater conditions.

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“…His work aimed at determining with high precision the amount of morphological degradation of the surveyed area in order to evaluate its impact on the diversity and the abundance of the present organism. Regarding the measurement of the growth rate, Ferrari (Ferrari et al, 2017) studied the seasonal growth of hard corals colonies, Bennecke (Bennecke et al, 2016) measured directly from 3D models, generated using 1500 high resolution images collected across 10 m 2 , the growth along 8 years of deep seas corals.…”

Section: Introductionmentioning

confidence: 99%

Quasi-Orthorectified Projection for the Measurement of Red Gorgonian Colonies

Pavoni

Palma²,

Callieri

et al. 2018

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:This study presents a practical method to estimate dimensions of Paramuricea clavata colonies using generic photographic datasets collected across wide areas. Paramuricea clavata is a non-rigid, tree-like octocoral; this morphology greatly affects the quality of the sea fans multi-view stereo matching reconstruction, resulting in hazy and incoherent clouds, full of "false" points with random orientation. Therefore, the standard procedure to take measurements over a reconstructed textured surface in 3D space is impractical. Our method overcomes this problem by using quasi-orthorectified images, produced by projecting registered photos on the plane that best fits the point cloud of the colony. The assessments of the measures collected have been performed comparing ground truth data set and time series images of the same set of colonies. The measurement errors fall below the requirements for this type of ecological observations. Compared to previous works, the presented method does not require a detailed reconstruction of individual colonies, but relies on a global multi-view stereo reconstruction performed through a comprehensive photographic coverage of the area of interest, using a lowcost pre-calibrated camera. This approach drastically reduces the time spent working on the field, helping practitioners and scientists in improving efficiency and accuracy in their monitoring plans.

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In situ growth rates of deep-water octocorals determined from 3D photogrammetric reconstructions

Cited by 37 publications

References 41 publications

How Reliable Is Structure from Motion (SfM) over Time and between Observers? A Case Study Using Coral Reef Bommies

How Reliable Is Structure from Motion (SfM) over Time and between Observers? A Case Study Using Coral Reef Bommies

Underwater Photogrammetry, Coded Target and Plenoptic Technology: A Set of Tools for Monitoring Red Coral In Mediterranean Sea in the Framework of the ”perfect” Project

Quasi-Orthorectified Projection for the Measurement of Red Gorgonian Colonies

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