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TitleCoverage and quality of seafloor imagery - a comparison between towed video platforms and AUV borne still images
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AuthorJakobsen, F; Bellec, V; Thorsnes, T
SourceProgram and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; by Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Geological Survey of Canada, Open File 8295, 2017 p. 61, https://doi.org/10.4095/305869 (Open Access)
LinksGeoHab 2017
Year2017
PublisherNatural Resources Canada
Meeting2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Geological Survey of Canada, Open File 8295
File formatpdf
Subjectsmarine geology; surficial geology/geomorphology; geophysics; mapping techniques; oceanography; marine environments; coastal studies; continental margins; continental shelf; continental slope; photography; geophysical surveys; acoustic surveys, marine; sonar surveys; bathymetry; seafloor topography; marine sediments; bedforms; geological mapping; geological mapping techniques; autonomous underwater vehicle (AUV)
ProgramOcean Management Geoscience, Offshore Geoscience
Released2017 09 26
AbstractThe 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