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: Appropriate credit must be given to Hakai Institute and the authors of the dataset.

Data and Resources


Metadata Created October 26, 2018, 22:48 (UTC)
Metadata Updated October 26, 2018, 22:48 (UTC)
Reference Date(s) 2018-02-26 (Creation)
2018-07-22 (Publication)
Frequency of Update
Metadata Date October 17, 2018, 22:53 (UTC)

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Dataset extent

Map data © OpenStreetMap contributors

Additional Info

Field Value
Contact Email
encoding utf8
metadata-language eng
progress completed
resource-type dataset
Responsible Party Hakai Institute (Point of Contact)
spatial-reference-system 3156