photoQuad: A dedicated seabed image processing software, and a comparative error analysis of four photoquadrat methods

Trygonis, Vasilis; Sini, Maria

doi:10.1016/j.jembe.2012.04.018

Cited by 193 publications

(116 citation statements)

References 36 publications

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“…Gorgonians were 'discernible' when the whole colony was clearly visible (e.g., cloudy water, fish, or colony orientation did not obscure large parts). In the third stage, injured and healthy regions on gorgonians were outlined using the software photoQuad (Trygonis and Sini 2012). Injury impact rankings (degree of injury) were assigned based on the categorical scale (0-4) described by White et al (2012) where '0' denoted healthy and '4' indicated [90 % damage.…”

Section: Laboratory Methodsmentioning

confidence: 99%

Decline in condition of gorgonian octocorals on mesophotic reefs in the northern Gulf of Mexico: before and after the Deepwater Horizon oil spill

Etnoyer¹,

Wickes²,

Silva

et al. 2015

Coral Reefs

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Hard-bottom 'mesophotic' reefs along the '40-fathom' (73 m) shelf edge in the northern Gulf of Mexico were investigated for potential effects of the Deepwater Horizon (DWH) oil spill from the Macondo well in April 2010. Alabama Alps Reef, Roughtongue Reef, and Yellowtail Reef were near the well, situated 60-88 m below floating oil discharged during the DWH spill for several weeks and subject to dispersant applications. In contrast, Coral Trees Reef and Madison Swanson South Reef were far from the DWH spill site and below the slick for less than a week or not at all, respectively. The reefs were surveyed by ROV in 2010, 2011, and 2014 and compared to similar surveys conducted one and two decades earlier.Large gorgonian octocorals were present at all sites in moderate abundance including Swiftia exserta, Hypnogorgia pendula, Thesea spp., and Placogorgia spp. The gorgonians were assessed for health and condition in a beforeafter-control-impact (BACI) research design using still images captured from ROV video transects. Injury was modeled as a categorical response to proximity and time using logistic regression. Condition of gorgonians at sites near Macondo well declined significantly post-spill. Before the spill, injury was observed for 4-9 % of large gorgonians. After the spill, injury was observed in 38-50 % of large gorgonians. Odds of injury for sites near Macondo were 10.8 times higher post-spill, but unchanged at far sites. The majority of marked injured colonies in 2011 declined further in condition by 2014. Marked healthy colonies generally remained healthy. Background stresses to corals, including fishing activity, fishing debris, and coral predation, were noted during surveys, but do not appear to account for the decline in condition at study sites near Macondo well.

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Section: Laboratory Methodsmentioning

confidence: 99%

Decline in condition of gorgonian octocorals on mesophotic reefs in the northern Gulf of Mexico: before and after the Deepwater Horizon oil spill

Etnoyer¹,

Wickes²,

Silva

et al. 2015

Coral Reefs

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show abstract

“…1.2). Point annotations are typically preformed using manual, off-line annotation software like Coral Point Count with Excel Extensions (CPCe) [70] or photoQuad [135] which facilitate the annotation process by providing user interfaces and tools for export of relevant data. More recently, web-based annotation tools such as Biigle (biigle.de) and Catami (catami.org) have been developed, however these also require manual annotation, with consequent extensive time requirements for analysis.…”

Section: Point Annotationsmentioning

confidence: 99%

“…Point annotations are typically preformed using manual, off-line annotation software like Coral Point Count with Excel Extensions (CPCe) [70], photoQuad [135], or pointCount99 which facilitate the annotation process by providing user interfaces and tools for export of relevant data.…”

Section: Introductionmentioning

confidence: 99%

Automated annotation of coral reef survey images

Beijbom

Edmunds

Kline

et al. 2012

2012 IEEE Conference on Computer Vision and Pattern Recognition

233

248

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“…A abundância das espécies incrustantes será estimada por meio da porcentagem de cobertura de cada quadrat, utilizando-se a técnica de intersecção de pontos, sendo recomendado o uso do programa CPCe (http://www.nova.edu/ocean/cpce/) ou do programa Photoquad (disponível em: http://www.mar.aegean.gr/sonarlab/photoquad/download/dl.php) (Trygonis & Sini, 2012). O Photoquad tem oferecido menores problemas de estabilidade de uso e de dados em relação ao CPCe.…”

Section: Estimativa Da Porcentagem De Cobertura Dos Organismosunclassified

Protocolos para o monitoramento de habitats bentônicos costeiros - Rede de Monitoramento de Habitat Bentônicos Costeiros - ReBentos

Turra¹,

Denadai²

2015

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photoQuad: A dedicated seabed image processing software, and a comparative error analysis of four photoquadrat methods

Cited by 193 publications

References 36 publications

Decline in condition of gorgonian octocorals on mesophotic reefs in the northern Gulf of Mexico: before and after the Deepwater Horizon oil spill

Decline in condition of gorgonian octocorals on mesophotic reefs in the northern Gulf of Mexico: before and after the Deepwater Horizon oil spill

Automated annotation of coral reef survey images

Protocolos para o monitoramento de habitats bentônicos costeiros - Rede de Monitoramento de Habitat Bentônicos Costeiros - ReBentos

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