Extent of Canopy-Forming Kelps, Derived from World View-2, Central Coast, Central Coast, British Columbia

This dataset represents the extent of canopy-forming kelp (Nereocystis luetkeana and Macrocytis pyrifera) present at the ocean surface (hereafter referred to as surface canopy-forming kelp) for the year and season the imagery was collected. Canopy-forming kelp (Order Laminariales) are found along the coast of British Columbia. Two species, bull kelp (Nereocystis luetkeana) and giant kelp (Macrocystis pyrifera) are the most common species and are ecologically and biologically important components of nearshore ecosystems. Mapping their distribution is important for understanding the state and health of coastal areas.

The WorldView-2 satellite was tasked by the Hakai Institute and imagery collected in the summer of 2014 for the Goose group, McMullin group, Calvert Island, and Stirling Island region. Additional WorldView-2 imagery was acquired via a DigitalGlobe Foundation Grant for the South Calvert region, Simonds Group, Admiral and Tribal Groups region, Spider Island and Cultus Sound region. Imagery from the Stryker Island and Athlone Island region was provided through a collaboration of the Department of Fisheries and Oceans Canada and the Hakai Institute.

Prior to classification, each image region was corrected for atmospheric effects and land areas were masked. A supervised classification (maximum liklihood algorithm) was conducted to classify pixels which represent surface canopy-forming kelp. The results were imported into ArcGIS (10.5.1) and manually edited to remove pixel regions that were misclassified as kelp.

The majority of the imagery was collected August 13th, 2014. The image scene centered around the Stryker Island and Athlone Island region was collected July 22nd, 2012. The image scene centered around the South Calvert region was collected June 4th, 2015.

Contributors: Luba Reshitnyk and Wiebe Nijland

Cite as: Canopy-forming kelps extent derived from WorldView-2 imagery, Central Coast, British Columbia, Canada. Version 1.0. Hakai Institute. Dataset. [access date].)

本数据集记录了影像采集年份及季候下，海洋表面存在的造冠褐藻（canopy-forming kelp）的分布范围，涉及物种为牛海带（Nereocystis luetkeana）与巨藻（Macrocystis pyrifera），下文统一称为海洋表层造冠褐藻。造冠褐藻隶属于海带目（Laminariales），广泛分布于不列颠哥伦比亚省沿岸海域，其中上述两种为最常见的优势物种，是近岸生态系统中兼具重要生态与生物学价值的组成部分。对其分布进行测绘，可为理解沿岸海域的生态状态与健康水平提供关键依据。

本数据集所用的WorldView-2卫星影像由Hakai研究所（Hakai Institute）委托采集，2014年夏季完成了古斯群岛（Goose Group）、麦克马伦群岛（McMullin Group）、卡尔弗特岛（Calvert Island）及斯特灵岛（Stirling Island）区域的影像获取。另有部分WorldView-2影像通过DigitalGlobe基金会专项拨款（DigitalGlobe Foundation Grant）获取，覆盖南卡尔弗特区域、西蒙兹群岛（Simonds Group）、阿德默勒尔与部落群岛（Admiral and Tribal Groups）区域、斯派德岛（Spider Island）与卡尔图斯湾（Cultus Sound）区域。斯特赖克岛（Stryker Island）与阿特隆岛（Athlone Island）区域的影像，则由加拿大渔业与海洋部（Department of Fisheries and Oceans Canada）与Hakai研究所合作提供。

在开展分类作业前，所有影像区域均已完成大气校正，并对陆地区域进行了掩膜处理。随后采用监督分类法（最大似然算法）对代表海洋表层造冠褐藻的像素进行分类。分类结果被导入ArcGIS（10.5.1）地理信息系统软件，并通过人工编辑移除被误分类为褐藻的像素区域。

本数据集绝大多数影像采集于2014年8月13日；以斯特赖克岛与阿特隆岛区域为中心的影像场景采集于2012年7月22日；以南卡尔弗特区域为中心的影像场景则采集于2015年6月4日。

贡献者：卢巴·雷什特尼克（Luba Reshitnyk）与维贝·尼兰（Wiebe Nijland）

引用格式：源自加拿大不列颠哥伦比亚省中海岸区域WorldView-2影像解译的造冠褐藻分布范围，版本1.0，Hakai研究所，数据集，[访问日期]。