GEOSCAN, résultats de la recherche


TitreThe use of 3D photogrammetry to investigate cold-water coral habitat structure and the spatial distribution of associated communities
TéléchargerTéléchargement (publication entière)
LicenceVeuillez noter que la Licence du gouvernement ouvert - Canada remplace toutes les licences antérieures.
AuteurPrice, D M; Robert, K; Huvenne, V A I; Bates, A; Lo Lacono, C; Hall, R; Callaway, A
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; par Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Commission géologique du Canada, Dossier public 8295, 2017 p. 96, (Accès ouvert)
LiensGeoHab 2017
ÉditeurRessources naturelles Canada
Réunion2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Commission géologique du Canada, Dossier public 8295
Sujetstechniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement; écosystèmes; récifs; levés géophysiques; levés acoustiques marins; levés au sonar; méthodes photogrammétriques; photographie; bathymétrie; logiciel; établissement de modèles; Coraux; biologie; géologie marine; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; géophysique
ProgrammeGéoscience en mer, Géoscience de la gestion des océans
Diffusé2017 09 26
Résumé(disponible en anglais seulement)
Seafloor mapping at different scales via multibeam echosounder (MBES) has become a prominent tool for characterizing marine habitats. Cold-water coral reefs, for example, have been mapped from shipboard, AUV and ROV mounted MBES systems, providing increasing clarity into their spatial extent and habitat heterogeneity. Structure from Motion (SfM) techniques which create high-resolution 3D models of habitats are being increasingly utilised, in tandem with the potential for 3D spatial analysis in ecological research. This tool is becoming especially common for surveying shallow water coral reefs. Here we provide 3D reconstructions of a cold-water coral reef, located at 750m water depth in the Explorer Canyon, a tributary of the Whittard Canyon, NE Atlantic - England's only known living coral reef.
ROV video data were collected during the JC125 expedition, funded by the ERC CODEMAP project (Starting Grant no 258482) and the NERC MAREMAP programme. These data were processed with Agisoft Photoscan software to reconstruct 3D point-cloud models for an area covering 11.3mx8.7m of the reef. Digital elevation models derived from the 3D reconstruction allowed for spatial terrain analysis. Rugosity and slope clearly relates to reef patches as expected, showcasing the habitat complexity that coral adds to the environment, and rugosity values were comparable to tropical coral reefs. Viewing the reef from different angles revealed the presence of individual organisms that would have otherwise been missed by a typical linear transect. Using the raw video data and 3D model, we were able to plot the fine scale distribution of reef inhabitants. The use of habitat suitability modelling with the 3D reconstructions provided promising insights into what drives fine-scale species distribution and biodiversity within reef habitats. Ultimately, analysing fine-scale parameters of cold-water coral reefs in 3D provides novel and detailed information about reef communities.