Spatial extent of surface canopy kelp derived from fixed-wing surveys (2024), Central Coast, British Columbia, Canada

This data package consists of digitized surface canopy extent for two species of canopy forming kelp – giant kelp (Macrocystis pyrifera) and bull kelp (Nereocystis luetkeana) – for two regions on the Central Coast of British Columbia, Canada. Spatial datasets of kelp canopy were derived from high resolution aerial imagery (10 cm) collected from fixed-wing aerial surveys flown on September 20th, 2024. The survey regions included (1) southwest Calvert Island and Kelp Head and (2) an area including the Goose Group, McMullin Group and southwest Stryker Island. Survey windows for imagery collection were considered based on obtaining imagery during maximum kelp extent and during a low tide cycle therefore survey windows were planned between July through September during tides of less than +2.0 m (mean low low water).

Imagery Capture: Four-band imagery (red-green-blue-near infrared) was collected using two high resolution cameras aboard the Airborne Coastal Observatory (ACO, a fixed-wing aircraft) at tide levels less than 2 m (chart datum) during boreal summer. Imagery collection and orthomosaic processing is described in associated reports linked in this record.

Kelp delineation: Surface kelp canopy is represented by polygons which were digitized using the Hakai Institute Kelp-O-Matic AI tool. Datasets were reviewed by a expert analyst for quality analysis/quality control purposes.

The data package includes:

- ACO metadata report (.pdf) which describe the system used to acquire and process imagery.
- Polygon shapefiles (.shp) of the extent of kelp canopy at each monitoring site by year.

Coordinate system used: NAD1983 UTM Zone 9N

These data were collected in partnership between Marine Plan Partnership for the North Pacific Coast (MaPP) and the Hakai Institute. This data package is a component of the MaPP Regional Kelp Monitoring Program (RKMP) whose goals (among many) are to monitor the extent and condition of kelp forests across all four sub-regions in recognition of kelp’s ecological, cultural and economic importance. This data package is also a part of the Hakai Institute's Marine Habitat Mapping Program whose broader goal is to document and understand long-term trends of kelp forests dynamics and drivers at local, regional and coast-wide scales.

The use of this dataset requires permission from both MaPP and the Hakai Institute.

Please communicate and/or collaborate with Hakai and MaPP if you are considering using this dataset for manuscripts or other forms of analysis and reporting. Contact Luba Reshitnyk ([e-mail]) or [e-mail] for more information about data access and opportunities to collaborate with the Hakai Institute. Contact Sarah Schroeder ([e-mail]) and Genevieve Reynolds ([e-mail]) for more information about data access to and opportunities to collaborate with MaPP.