Nearshore substrate classification - Northwest Calvert Island, BC (2015-2017)

This layer contains polygons outlining the substrate types present in the intertidal and shallow subtidal waters surrounding Northwest Calvert Island.

Substrates were manually delineated using 9-10cm resolution orthomosaics using 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) and the substrates digitized in ESRI ArcGIS 10.5.

Kelp layers were added using existing data generated as per the methods outlined in the linked dataset 'Kelp Canopy extent - Calvert Island - 2006-2016'. The combined kelp canopy extent from the years 2012, 2014, 2015 was used. 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 with the rock and then the category of mixed was applied.

Eelgrass extent was digitized from a towed underwater video system. Detailed methods for this 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

Hakai Data Access Online Request FormHTML Popular

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Intertidal and shallow sub-tidal substrate...HTML

Shapefile containing the classified substrates for NW Calvert Island

The table defines the fields in the Calvert...PDF

The table defines the fields in the Calvert Substrate dataset

UAS methods for obtaining imagery used to...PDF

UAS methods for obtaining imagery used to digitize substrate types

Citation

Keywords

Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) September 23, 2021 (Publication)
September 23, 2021 (Revision)
Data Reference Date(s) January 16, 2018 (Publication)
Frequency of Update As Needed

Access full metadata here

Source last modified August 25, 2022 at 04:07

Other records harvested from Hakai Metadata Form data

Responsible Party 1
Name
Matthew Henderson
Affiliation
Hakai Institute
Role
  • Originator
  • Point of Contact
  • Processor
Responsible Party 2
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Distributor
  • Owner
  • Resource Provider
Responsible Party 3
Name
Hakai Geospatial Technology Team
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Custodian
  • Point of Contact

Field Value
Ocean Variables Other
Scope Dataset
Status Under Development
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Spatial Extent { "coordinates": [ [ [ -128.18865863, 51.63201591 ], [ -127.98747149, 51.63201591 ], [ -127.98747149, 51.73504091 ], [ -128.18865863, 51.73504091 ], [ -128.18865863, 51.63201591 ] ] ], "type": "Polygon" }
North Bounding Latitude 51.73504091
South Bounding Latitude 51.63201591
East Bounding Longitude -127.98747149
West Bounding Longitude -128.18865863
Vertical Extent
Min
0.0
Max
500.0
Default Locale English