100 Islands Project - 2017 Island Points and Polygons

This layer includes polygons representing the islands studied by the 100 Islands research program at the Hakai Institute. A centroid points layer is also included. The 100 Islands Project seeks to blend the theory of island biogeography with theories about ecosystem subsidies, to understand how nutrients from the sea affect the ecology of plants, breeding birds, mammals, insects and amphibians. To do this we will be studying 100 islands near the Hakai Institute on Calvert Island. Little is known of the diversity on these islands and therefore we have a great opportunity to conduct lots of interesting work, including mapping of major taxa, tracking marine-derived nutrients along shorelines (think seaweed deposition) and into the forests, and measuring stable isotope signatures in a variety of organisms (from tiny plants to large mammals), to name just a few!

Attributes: Island_ID [AA01]: Primary identifier for all ‘100 Islands’ Islands. two letters (Capitalized) identify the island group, two numbers (use leading zero!) identify each island.

C_Easting [m] / C_Northing [m]: X-coordinate (Easting) and Y-coordinate (Northing) of the Island center point. Projection is equal to the shapefile [WGS84, UTM zone 9N]. in meters from projection origin, no decimals are given.

Area [m2]: Island land area in square meters. The area is calculated over the land area as derived from WorldView2 satellite images (2m resolution) the un-vegetated outside area and tidal zone are excluded.

Perimeter [m]: Perimeter around the land area as used to derive the ‘Area’ field. Derived from 2m resolution WorldView2 satellite images, shapes are not generalized and trace the pixel shape.

PA_norml [-]: Perimeter-Area ratio corrected for island size. A circle will always have PA_norml = 1 regardless of size.

Exp_SHZN: Island general exposure as derived from the BC Shorezone dataset. Reflects the exposure on the more exposed side of each island. 6 classes (Very Exposed, Exposed, Semi Exposed, Semi Protected, Protected, Very Protected) DistW_ML [m]: Distance to Mainland over water in meters measured using the least distance of water crossing.

Dist_Near [m]: Distance to nearest vegetated land.

Neighb_250 [°]: Radial coverage of land within 250m from the Island. (0 – 360°) i.e. the amount of surrounding land measured by the degrees of a circle it covers.

NDVI_Mean [-]: Mean Normalized Difference Vegetation Index for the internal area of each island. NDVI is derived from WorldView2 images and available at its original 2m resolution.

Dataset created by Wiebe Nijland and Luba Reshitnyk

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) 2017-02-25 (Creation)
2017-02-25 (Publication)
Frequency of Update
Metadata Date October 17, 2018, 21:47 (UTC)

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Map data © OpenStreetMap contributors

Additional Info

Field Value
Contact Email data@hakai.org
encoding utf8
metadata-language eng
progress completed
resource-type dataset
Responsible Party Hakai Institute (Point of Contact, Processor)
spatial-reference-system 32609