Eelgrass Extent - Coastal British Columbia

This dataset represents polygons of eelgrass on the BC coast predicted from existing geospatial datasets of seagrass extent (ShoreZone) and bathymetry.

The extent of eelgrass in British Columbia was estimated using a novel tool created for ArcGIS (the Gregrator).This tool requires 2 inputs: (1) the coastline data from Shorezone (including line shapefiles that represent the extent of eelgrass) and (2) bathymetry data. Briefly, each line segment of coast in ShoreZone is converted to points along its vertices. These points are used to generate Thiessen polygons, where each Thiessen polygon “defines an area of influence around its sample point, so that any location inside the polygons is closer to that point than any of the other sample points” (Esri, 2016). Thiessen polygons were then clipped to the extent of polygons which spanned the area from the coastline to maximum depth based on the results of the bathymetry analysis. These methods are based on those described in Gregr et al 2013.

Gregr, E. J., Lessard, J., & Harper, J. (2013). Progress in Oceanography A spatial framework for representing nearshore ecosystems. Progress in Oceanography, 115, 189–201. http://doi.org/10.1016/j.pocean.2013.05.028

Contact data@hakai.org for more information

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

Citation

Keywords

Dataset extent

Map data © OpenStreetMap contributors

Metadata Reference Date(s) January 18, 2022 (Publication)
January 18, 2022 (Revision)
Dataset Reference Date(s) September 02, 2016 (Publication)
Frequency of Update As Needed

Responsible Party 1
Name
Luba Reshitnyk
Affiliation
Hakai Institute
Role
  • Point of Contact
  • Principal Investigator
  • Processor
Responsible Party 2
Affiliation
Hakai Institute
Email
data@hakai.org
Role
  • Custodian
  • 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
  • Seagrass cover and composition
  • Other
Scope Dataset
Status On Going
Topic Category oceans
Maintenance Note Generated from https://cioos-siooc.github.io/metadata-entry-form
Spatial Extent { "coordinates": [ [ [ -133.7841801345348, 48.23443097294032 ], [ -122.49023482203482, 48.23443097294032 ], [ -122.49023482203482, 54.52958287232971 ], [ -133.7841801345348, 54.52958287232971 ], [ -133.7841801345348, 48.23443097294032 ] ] ], "type": "Polygon" }
North Bounding Latitude 54.52958287232971
South Bounding Latitude 48.23443097294032
East Bounding Longitude -122.49023482203482
West Bounding Longitude -133.7841801345348
Vertical Extent
Min
0.0
Max
50.0
Default Locale English
Citation identifier
Code
10.21966/1ty5-e654