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TitreCoverage and quality of seafloor imagery - a comparison between towed video platforms and AUV borne still images
TéléchargerTéléchargement (publication entière)
AuteurJakobsen, F; Bellec, V; Thorsnes, T
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. 61, https://doi.org/10.4095/305869 (Accès ouvert)
LiensGeoHab 2017
Année2017
ÉditeurRessources naturelles Canada
Réunion2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017
Documentdossier public
Lang.anglais
DOIhttps://doi.org/10.4095/305869
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
Formatspdf
Sujetstechniques de cartographie; océanographie; milieux marins; études côtières; marges continentales; plate-forme continentale; talus continental; photographie; levés géophysiques; levés acoustiques marins; levés au sonar; bathymétrie; topographie du fond océanique; sédiments marins; configurations lit; géologie marine; géologie des dépôts meubles/géomorphologie; géophysique
ProgrammeGéoscience de la gestion des océans, Géoscience en mer
Diffusé2017 09 26
Résumé(disponible en anglais seulement)
The MAREANO programme has mapped c. 175,000 square kilometres of the Norwegian continental shelf and slope since 2005. Geological seafloor mapping is usually based on a combination of ship-mounted multibeam echosounders, sub-bottom profiler, grab samples and towed video platforms (Campod) for visual inspection. From a geological perspective we wanted to compare this technology with data collected from an Autonomous Underwater Vehicle (AUV) in terms of area coverage and image quality.
Here we present a pilot project where we tested the use of an AUV as a platform to collect both acoustic and visual data. An AUV borne TFish colour photo system was used to collect high quality still images of the seafloor in high spatial resolution. The average Campod video transects used in MAREANO are about 700 m long and takes c. 30 minutes. During this time interval the AUV can travel a distance between 3600- 7200 m, and cover an average area of c. 32 000 square metres. In comparison the Campod video data only covers an area of c. 1500 square metres.
The image quality from data acquired by towed video platforms and AUVs depends on a number of factors such as flight height, water turbidity, terrain roughness (particularly for AUVs), optical quality of the imaging system and wave movements (for towed systems).
We will discuss the suitability of the platforms and their pro's and con's in terms of area coverage and image quality.
GEOSCAN ID305869