Nearshore substrates of the McMullin Group Islands - British Columbia - 2017

This polygon layer describes the type and extent of intertidal and shallow subtidal substrates for the McMullin Island Group on the Central Coast of British Columbia, Canada.

Substrates and kelp were manually delineated using 9-10cm resolution orthomosaics from imagery captured at tide heights lower than +1.0 m mean low water. The orthomosaics were obtained using an unoccupied aerial system (UAS) and post-processed using the Pix4Dmapper software package (see attached UAS methods). The imagery was segmented using E-Cognition Developer software and manually classified in ESRI ArcGIS 10.5.1. For areas with high-density kelp, we assumed the substrate was rock. Areas covered with low-density kelp were also considered rock unless sand could be detected mixed amongst the rock and then the category of mixed was applied. Eelgrass extent was digitized from a towed underwater video system. Detailed methods for the eelgrass delineation procedure can be seen at the linked record, 'Eelgrass Extent 2014 - Central Coast'.

Access and Use

Licence: Creative Commons Attribution 4.0
Limitations: Appropriate credit must be given to Hakai Institute and the authors of the dataset.

Data and Resources



Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) September 23, 2021 (Publication)
September 23, 2021 (Revision)
Data Reference Date(s) July 22, 2018 (Publication)
Frequency of Update As Needed

Responsible Party 1
Hakai Institute
  • Distributor
  • Owner
  • Resource Provider
Responsible Party 2
Hakai Geospatial Technology Team
Hakai Institute
  • Custodian
  • Point of Contact

Field Value
Ocean Variables Other
Scope Dataset
Status Completed
Topic Category oceans
Maintenance Note Generated from
Spatial Extent { "coordinates": [ [ [ -128.44047408, 52.02922276 ], [ -128.39240889, 52.02922276 ], [ -128.39240889, 52.06790383 ], [ -128.44047408, 52.06790383 ], [ -128.44047408, 52.02922276 ] ] ], "type": "Polygon" }
North Bounding Latitude 52.06790383
South Bounding Latitude 52.02922276
East Bounding Longitude -128.39240889
West Bounding Longitude -128.44047408
Vertical Extent
Default Locale English