Recherche documentaire
Trier par :
-
The sediment backscatter strength measured by multibeam echosounders is a key feature for seafloor mapping either qualitative (image mosaics) or quantitative (extraction of classifying features). An important phenomenon, often underestimated, is the dependence of the backscatter level on the...Contributeur (s):
-
Sen, Arunima / Ondreas, Helene / Gaillot, Arnaud / Marcon, Yann / Augustin, Jean-marie / Olu, Karine - 2016Deep-sea ecosystems have attracted considerable commercial interest in recent years because of their potential to sustain a diverse range of mankind's industrial needs. If these systems are to be preserved or exploited in a sustainable manner, mapping habitats and species distributions is...Contributeur (s):
-
Stanisiere, Jean-yves / Mazurie, Joseph / Bouget, Jean-francois / Langlade, Aime / Gabellec, Raoul / Retho, Michael / Quinsat, Kevin / Leclerc, Emilie / Cugier, Philippe / Dussauze, Morgan / Menesguen, Alain / Dumas, Franck / Gohin, Francis / Augustin, Jean-marie / Ehrhold, Axel / Sinquin, Jean-marc / Goubert, Evelyne / Dreano, Alain - 2013The project “Risco”, supported by the “Pôle Mer” and funded by the Regional Council of Brittany, deals with specific risks of mortality of oysters, Crassostrea gigas, cultivated on the bottom, in a subtidal bay of South Brittany : the bay of Quiberon (56, France). Massive mortalities of oysters...Contributeur (s):
-
Mazurie, Joseph / Stanisiere, Jean-yves / Bouget, Jean-francois / Langlade, Aime / Leclerc, Emilie / Quinsat, Kevin / Herve, Gilles / Augustin, Jean-marie / Ehrhold, Axel / Sinquin, Jean-marc / Meidi-deviarni, Ika / Goubert, Evelyne / Cochet, Helene / Dreano, Alain - 2013This study (“Risco”), implicating both industry, socio-economic experts and biologists, was funded by the Regional Council of Brittany, for 3 years (2010-2012), to investigate about the causes of oysters (Crassostrea gigas) mortalities in the bay of Quiberon (South Brittany, France). The protocol...Contributeur (s):
-
Dano, Alexandre / Praeg, Daniel / Migeon, Sebastien / Augustin, Jean-marie / Ceramicola, Silvia / Ketzer, Joao Marcelo / Augustin, Adolfo Herbert / Ducassou, Emmanuelle / Mascle, Jean - 2015The central Nile Deep-Sea Fan contains a broad area of seabed destabilisation in association with fluid seepage: slope-parallel sediment undulations are associated with multibeam high-backscatter patches (HBPs) related to authigenic carbonates. During the 2011 APINIL campaign, a deep-towed sidescan...Contributeur (s):
-
Mazurie, Joseph / Stanisiere, Jean-yves / Bouget, Jean-francois / Langlade, Aime / Leclerc, Emilie / Quinsat, Kevin / Herve, Gilles / Augustin, Jean-marie / Ehrhold, Axel / Sinquin, Jean-marc / Meidi-deviarni, Ika / Goubert, Evelyne / Cochet, Helene / Dreano, Alain - 2013This study (“Risco”), implicating both industry, socio-economic experts and biologists, was funded by the Regional Council of Brittany, for 3 years (2010-2012), to investigate about the causes of oysters (Crassostrea gigas) mortalities in the bay of Quiberon (South Brittany, France). The protocol...Contributeur (s):
-
Stanisiere, Jean-yves / Mazurie, Joseph / Bouget, Jean-francois / Langlade, Aime / Gabellec, Raoul / Retho, Michael / Quinsat, Kevin / Leclerc, Emilie / Cugier, Philippe / Dussauze, Morgan / Menesguen, Alain / Dumas, Franck / Gohin, Francis / Augustin, Jean-marie / Ehrhold, Axel / Sinquin, Jean-marc / Goubert, Evelyne / Dreano, Alain - 2013The project “Risco”, supported by the “Pôle Mer” and funded by the Regional Council of Brittany, deals with specific risks of mortality of oysters, Crassostrea gigas, cultivated on the bottom, in a subtidal bay of South Brittany : the bay of Quiberon (56, France). Massive mortalities of oysters...Contributeur (s):
-
Lurton, Xavier / Ladroit, Yoann / Augustin, Jean-marie - 2012Swath sonar bathymetry accuracy depends on the intrinsic performance of acoustic signal processing. We propose here a quality factor, quantifying the accuracy associated with every sounding computation. This descriptor is derived from simple models either for amplitude (variance of the centre-of-...Contributeur (s):
-
For modern multibeam echosounders, the use of a robust and reliable quality estimator associated with each sounding is an absolute necessity. Indeed, due to the large volume of data acquired, a lot of time is lost, both during the survey and the post-processing. This is a costly problem for...Contributeur (s):
-
A comprehensive EM300 multibeam echo-sounder dataset acquired from Cook Strait, New Zealand, is used to develop a regional-scale objective characterisation of the seafloor. Sediment samples and high-resolution seismic data are used for ground-truthing. SonarScope (R) software is used to process the...Contributeur (s):
-
Lurton, Xavier / Augustin, Jean-marie - 2010The quality estimation associated with individual soundings measured and computed by swath bathymetry sonars is a paramount issue which is most often imperfectly addressed today by sonar manufacturers. In this paper, a unified definition is proposed for a quality factor usable for all swath...Contributeur (s):
-
Karoui, Imen / Fablet, Ronan / Boucher, Jean-marc / Augustin, Jean-marie - 2010This paper investigates variational region-level criterion for supervised and unsupervised texture-based image segmentation. The focus is given to the demonstration of the effectiveness and robustness of this region-based formulation compared to most common variational approaches. The main...Contributeur (s):
-
Dupre, Stephanie / Scalabrin, Carla / Grall, Celine / Augustin, Jean-marie / Henry, Pierre / Sengor, A. M. Celal / Goeruer, Naci / Cagatay, M. Namik / Geli, Louis - 2015Understanding of the evolution of fluid-fault interactions during earthquake cycles is a challenge that acoustic gas emission studies can contribute. A survey of the Sea of Marmara using a shipborne, multibeam echo sounder, with water column records, provided an accurate spatial distribution of...Contributeur (s):
-
Karoui, Imen / Fablet, Ronan / Boucher, Jean-marc / Augustin, Jean-marie - 2008We propose a new region-based segmentation of textured sonar images with respect to seafloor types. We characterize sea-floor types by a set of empirical distributions estimated on texture responses to a set of different filters and we introduce a novel similarity measure between sonar textures in...Contributeur (s):
-
Karoui, I / Fablet, R / Boucher, J.m. / Augustin, Jean-marie - 2009We propose and compare two supervised algorithms of the segmentation of textured sonar images with respect to seafloor types. We characterize sea-floors by a set of empirical distributions estimated on texture responses for a wide set of different filters with various parameterizations and we...Contributeur (s):