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Evaluating the ecological status of cold-water coral habitats using non-invasive methods: An example from Cassidaigne canyon, northwestern Mediterranean Sea ArchiMer
Fabri, Marie-claire; Vinha, Beatriz; Allais, Anne-gaelle; Bouhier, Marie-edith; Dugornay, Olivier; Gaillot, Arnaud; Arnaubec, Aurelien.
Cold-water coral ecosystems have been identified as vulnerable, but quantitative data on their conservation status is very limited. The Marine Strategy Framework Directive (MSFD) is the tool implemented by the European Union’s Integrated Maritime Policy to achieve Good Environmental Status (GES) of marine waters by 2020. In this context, the aim of this study was to evaluate the Ecological Status of benthic habitats in Cassidaigne canyon, focusing in particular on cold-water coral habitats dominated by Madrepora oculata. Data were collected during the Videocor1 cruise (2017). Videos and photos collected during eight dives of the H-ROV Ariane were used to reconstruct, in 3-dimensions, the areas where cnidarians have settled in the canyon. A total of 33 3D...
Tipo: Text Palavras-chave: Biodiversity; Photogrammetry; Habitat mapping; Bauxite residues; Vulnerable marine ecosystems.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00511/62293/66719.pdf
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SOFI: a 3D simulator for the generation of underwater optical images ArchiMer
Allais, Anne-gaelle; Bouhier, Marie-edith; Edmond, Toussaint; Maciol, Nicolas; Nicolas, Stephane; Boffety, M.; Galland, Frederic; Chami, Malik; Ebert, Kerstin.
We present an original simulator - called SOFI - for the synthetic generation of underwater optical images. The simulator architecture is flexible and relies on flow diagrams in order to allow the integration of various models for image generation which are based on the underwater optical phenomena. The objective is also to ensure real time or quasi real time performance so it takes advantage of the latest technologies, such as GPGPU, and relies on GPU programming under CUDA. Two kinds of models for image generation are presented and should be integrated in SOFI: (1) the OSOA model based on the radiative transfer theory and (2) global image modeling which describes globally how an image is deteriorated under the effects of sea water.
Tipo: Text Palavras-chave: Simulator; GPU; GPGPU; Underwater; Radiative transfer; Image modeling.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00072/18326/16012.pdf
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