| Title | Distinguishing 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 |
| Download | Download (whole publication) |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Reshitnyk, L Y; Rubidge, E M |
| Source | Program 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. 99, https://doi.org/10.4095/305918  Open Access |
| Links | GeoHab 2017
|
| Year | 2017 |
| Publisher | Natural Resources Canada |
| Meeting | 2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; May 1-4, 2017 |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Program and abstracts: 2017
GeoHab Conference, Dartmouth, Nova Scotia, Canada |
| File format | pdf |
| Province | Western offshore region; British Columbia |
| NTS | 92M; 93D; 102P; 103A; 103B; 103G; 103H |
| Area | Central Coast Regional District |
| Lat/Long WENS | -131.0000 -126.0000 54.0000 51.0000 |
| Subjects | geophysics; mapping techniques; oceanography; marine environments; coastal studies; conservation; marine organisms; marine ecology; resource management; biological communities; environmental studies;
ecosystems; vegetation; software; nearshore environment; flow regimes; remote sensing; satellite imagery; modelling; Kelp; Biology |
| Illustrations | satellite images |
| Program | Offshore Geoscience |
| Released | 2017 09 26 |
| Abstract | 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. |
| Summary | (Plain Language Summary, not published)
The sixteenth annual GeoHab Conference was held this year (2017) at the Waterfront Campus of the Nova Scotia Community College in Dartmouth, Nova Scotia,
Canada. |
| GEOSCAN ID | 305918 |
|
|