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TitleScaling of interpretation with OBIA with backscatter data
DownloadDownload (whole publication)
AuthorLe Bas, T P
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. 75, https://doi.org/10.4095/305883 (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; environmental geology; geophysics; mapping techniques; oceanography; marine environments; coastal studies; conservation; marine organisms; marine ecology; resource management; biological communities; environmental studies; ecosystems; geophysical surveys; acoustic surveys, marine; sonar surveys; side-scan sonar; bathymetry; geophysical interpretations; submarine features; reefs; statistical methods; geological mapping; geological mapping techniques; biology; habitat mapping; habitat conservation; habitat management; data processing; object-based image analysis
Illustrationssketch maps
ProgramOcean Management Geoscience, Offshore Geoscience
Released2017 09 26
AbstractMultibeam Echosounder systems provide two datasets: a bathymetry grid and backscatter imagery. These can be combined together to produce an interpretation of these data using OBIA. The resulting interpretation divides the data into classes of similar attributes. However the question is what scale of interpretation is appropriate for the data and how does the scale of the data processing affect the results? Are the features that are extracted dependent on the processing resolution and the particular OBIA parameters?
Bathymetry and backscatter processing can be relatively automated and only have minor subjective input from the user, such as editing of outlier depths or removal of cross lines of backscatter, together with the resolution and level of smoothing.
Data will be presented at a variety of resolutions and with a variety of OBIA variables. The results will be compared to show whether the OBIA can distinguish seafloor features in the same manner as the human eye, for example to interpret either individual corals at high resolution or fields of coral at low resolution. Two sets of data will be showcased, one from shipboard multibeam over coral reefs (figure below) and one from an AUV multibeam and sidescan over rocky reef. It must be remembered however that OBIA will initially only classify areas has having similar "look" statistically, and not provide habitat identification or classification.
GEOSCAN ID305883