Quantification of marine macro-debris abundance around Vancouver Island, Canada, based on archived aerial photographs processed by projective transformation
Quantification of marine macro-debris abundance around Vancouver Island, Canada, based on archived aerial photographs processed by projective transformation
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DOI：
10.1016/j.marpolbul.2017.08.060
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发表时间：
2018-07-01
影响因子：
5.8
通讯作者：
Isobe, Atsuhiko
中科院分区：
文献类型：
--
作者：
Kataoka, Tomoya;Murray, Cathryn Clarke;Isobe, Atsuhiko
通过对在加拿大温哥华岛上空拍摄的存档海岸线航空照片应用图像处理技术，以高空间分辨率对海洋大型废弃物的丰度进行了量化。从飞机上以倾斜角度拍摄的照片通过投影变换进行处理，以进行地理参考，其中通过将航空照片与Google Earth的卫星图像进行比较来确定五个参考点。然后，根据海洋废弃物与背景海滩的颜色差异提取海洋废弃物的像素。可以用海洋废弃物覆盖面积与海滩面积的比率（覆盖百分比）来评估废弃物的丰度。根据167张航空照片成功地计算出了海洋废弃物覆盖率的水平分布，该分布与近海埃克曼流和风（背风漂流和斯托克斯漂流）密切相关。因此，估计的覆盖百分比是确定减轻广泛地区不利影响的优先地点的有用信息。
The abundance of marine macro-debris was quantified with high spatial resolution by applying an image processing technique to archived shoreline aerial photographs taken over Vancouver Island, Canada. The photographs taken from an airplane at oblique angles were processed by projective transformation for georeferencing, where five reference points were defined by comparing aerial photographs with satellite images of Google Earth. Thereafter, pixels of marine debris were extracted based on their color differences from the background beaches. The debris abundance can be evaluated by the ratio of an area covered by marine debris to that of the beach (percent cover). The horizontal distribution of percent cover of marine debris was successfully computed from 167 aerial photographs and was significantly related to offshore Ekman flows and winds (leeway drift and Stokes drift). Therefore, the estimated percent cover is useful information to determine priority sites for mitigating adverse impacts across broad areas.