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TitreScaling of interpretation with OBIA with backscatter data
TéléchargerTéléchargement (publication entière)
AuteurLe Bas, T P
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. 75, https://doi.org/10.4095/305883 (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/10.4095/305883
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; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement; écosystèmes; levés géophysiques; levés acoustiques marins; levés au sonar; sonar latéral; bathymétrie; interprétations géophysiques; caractéristiques sous-marines; récifs; méthodes statistiques; biologie; traitement des données; géologie marine; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; géophysique
Illustrationssketch maps
ProgrammeGéoscience de la gestion des océans, Géoscience en mer
Diffusé2017 09 26
Résumé(disponible en anglais seulement)
Multibeam 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