Efficiently measuring complex sessile epibenthic organisms using a novel photogrammetric technique

Abdo, David; Seager, James; Harvey, Euan S.; McDonald, Justin I.; Kendrick, Gary A.; Shortis, Mark R.

doi:10.1016/j.jembe.2006.07.015

Cited by 53 publications

(54 citation statements)

References 28 publications

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“…Since the late 1990s digital still cameras have been in use for underwater marine science applications such as sea floor mapping from a towed body (Edwards et al 2003) and are being applied to more demanding measurement tasks due to the high resolution of the images (Abdo et al 2006). The obtained results suggest that the use of UTV to rapidly assess demersal elasmobranch populations in large MPAs is preferable to UVC.…”

Section: Discussionmentioning

confidence: 99%

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

2007

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Elasmobranch stock assessment studies are usually made through fisheries surveys data. However, in large marine protected areas (MPAs) the use of destructive techniques must be dismissed in order to avoid population impacts. In 2005, while conducting a marine habitat survey in two marine Special Areas of Conservation (Sebadales de Playa de Inglés and Franja Marina de Mogán) in south Gran Canary Island (Canary Islands, Spain) with underwater towed video (UTV) and underwater visual census (UVC) transects, we recognized the opportunity rose to assess elasmobranch populations through UTV. Number of observed species and specimens, overall field work effort and total surveyed area were determined and compared between methods. Mean observations per day per unit of time (MOPUT) and mean observations per day per unit of surveyed area (MOPUA) were also compared through Mann-Whitney rank sum statistical test (α=0.05). Data analysis demonstrated that UTV is a very useful tool to rapidly assess elasmobranch populations in large MPAs in good visibility underwater environments. It can assess larger areas than UVC with the same effort (statistically significant difference found for the MOPUT; p=<0.001), leading to more observed species (5 vs 2) and specimens (46 vs 3) per day of work, with no loss in resolution power (MOPUA values were not significantly different between UTV and UVC; p=0.104).

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Section: Discussionmentioning

confidence: 99%

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

2007

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“…Stereo camera systems can also be used successfully for image quantification, including three-dimensional measurement (Abdo et al, 2006). These systems can also accurately measure range and bearing of midwater targets such as fish (Harvey et al, 2003).…”

Section: Stereo Camera Systemsmentioning

confidence: 99%

The use of towed camera platforms in deep-water science

Jones¹,

Bett²,

Wynn³

et al. 2009

uw tech: int j soc uw tech

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Towed camera platforms have been important in the study of the deep sea for over 30 years. The use of towed camera platforms in deep-water science is reviewed, drawing from the experiences of the National Oceanography Centre, Southampton's towed cameras, the Wide Angle Seabed Photography (WASP) vehicle and the Seafloor High Resolution Imaging Platform (SHRIMP). Practical considerations for towed camera platform use are outlined with particular reference to sensors, flying altitude and comparison between photographs and video. Although the technology for towed camera platforms will change over time, the concept remains of great value in studying the remote deep-sea environment.

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“…The popularity of photogrammetry has increased as the algorithms behind it improved and a few studies have evaluated the accuracy of its application to underwater organisms, from simple morphologies [16] to more complex ones [29,31,44,45]. Yet, it took over a decade to enable the application of photogrammetry to medium and large underwater scenes using, exclusively, images captured using monocular off-the-shelf cameras [32,33].…”

Section: Introductionmentioning

confidence: 99%

Quantifying Multiscale Habitat Structural Complexity: A Cost-Effective Framework for Underwater 3D Modelling

Ferrari

McKinnon²,

et al. 2016

Remote Sensing

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Coral reef habitat structural complexity influences key ecological processes, ecosystem biodiversity, and resilience. Measuring structural complexity underwater is not trivial and researchers have been searching for accurate and cost-effective methods that can be applied across spatial extents for over 50 years. This study integrated a set of existing multi-view, image-processing algorithms, to accurately compute metrics of structural complexity (e.g., ratio of surface to planar area) underwater solely from images. This framework resulted in accurate, high-speed 3D habitat reconstructions at scales ranging from small corals to reef-scapes (10s km 2 ). Structural complexity was accurately quantified from both contemporary and historical image datasets across three spatial scales: (i) branching coral colony (Acropora spp.); (ii) reef area (400 m 2 ); and (iii) reef transect (2 km). At small scales, our method delivered models with <1 mm error over 90% of the surface area, while the accuracy at transect scale was 85.3%˘6% (CI). Advantages are: no need for an a priori requirement for image size or resolution, no invasive techniques, cost-effectiveness, and utilization of existing imagery taken from off-the-shelf cameras (both monocular or stereo). This remote sensing method can be integrated to reef monitoring and improve our knowledge of key aspects of coral reef dynamics, from reef accretion to habitat provisioning and productivity, by measuring and up-scaling estimates of structural complexity.

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Efficiently measuring complex sessile epibenthic organisms using a novel photogrammetric technique

Cited by 53 publications

References 28 publications

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

Underwater towed video: a useful tool to rapidly assess elasmobranch populations in large marine protected areas

The use of towed camera platforms in deep-water science

Quantifying Multiscale Habitat Structural Complexity: A Cost-Effective Framework for Underwater 3D Modelling

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