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TitreDistinguishing between two canopy-forming kelp species (Macrocystis sp. and Nereocystis sp.) on the central coast of British Columbia using object-based image analysis with WorldView-2 pansharpened imagery
TéléchargerTéléchargement (publication entière)
AuteurReshitnyk, L Y; Rubidge, E M
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. 99, https://doi.org/10.4095/305918 (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/10.4095/305918
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
ProvinceRégion extracotière de l'ouest; Colombie-Britannique
SNRC92M; 93D; 102P; 103A; 103B; 103G; 103H
Lat/Long OENS-131.0000 -126.0000 54.0000 51.0000
Sujetstechniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement; écosystèmes; végétation; logiciel; milieu littoral; regimes d'écoulement; télédétection; imagerie par satellite; établissement de modèles; biologie; géophysique
Illustrationssatellite images
ProgrammeGéoscience de la gestion des océans, Géoscience en mer
Diffusé2017 09 26
Résumé(disponible en anglais seulement)
Canopy-forming kelp, which include giant kelp (Macrocystis integrifolia) and bull kelp (Nereocystis luetkeana) have been identified as ecologically significant species on the coast of British Columbia (BC). Giant kelp and bull kelp provide crucial habitat for multiple fish and invertebrate species, and they play a key role in nearshore nutrient and flow regimes. The spatial distribution of both kelp species is a crucial and currently missing input for marine protected area network planning and long-term ecological research.
An ongoing collaboration between the Hakai Institute, based on the Central Coast of BC, and the Pacific Region of Fisheries and Oceans Canada, seeks to examine the application of satellite imagery for mapping kelp extent on the BC coast. A primary objective of this research is to determine whether object-based image analysis (OBIA) could be used to differentiate and delineate the extent of both giant and bull kelp using high resolution satellite imagery.
A subset of pansharpened WorldView-2 imagery (0.5 m resolution) was selected for a region (McMullin Island group) on the Central Coast of BC where both species are known to be present. Knowledge of the region is extended via available field data and local ecological knowledge. While bull kelp and giant kelp have very similar spectral signatures (both are brown algae), they have very different morphologies. These morphological differences indicate that texture analysis would be best for species differentiation. Using recursive feature elimination, image feature variables (both spectral and textural) showed high differentiation between species. These variables were used as inputs for OBIA using eCognition software to test four scales of image segmentation and three different image classifiers.
The results of our study demonstrate high classification accuracy for mapping bull and giant kelp. We obtained user's and producer's accuracies greater than 90% for both kelp species using a random forest classifier. We also observed an effect of the scale of image segmentation on the results of the classifications. Overall, these methods and results demonstrate a first and novel instance of the application of OBIA for mapping multiple co-occurring species of canopy-forming kelp. Future research will include examining the effects of tide height and geographical location as well as developing methods for modelling kelp biomass.
GEOSCAN ID305918