Whales from space: counting southern right whales by satellite.
Whales from space: counting southern right whales by satellite.
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DOI：
10.1371/journal.pone.0088655
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Forcada J
中科院分区：
文献类型：
--
作者：
Fretwell PT;Staniland IJ;Forcada J
我们以阿根廷巴尔德斯半岛新努埃沃湾部分地区繁殖的南露脊鲸为例，描述了一种使用极高分辨率卫星图像识别和计数鲸鱼的方法。在过去的300年里，南露脊鲸被广泛猎杀，尽管数量在世纪初已经从濒临灭绝的状态中恢复过来，但目前的种群数量是分散的，估计只有狩猎前总数的一小部分。最近在构成最大单一种群的Península Valdés发生的极端露脊鲸幼鲸死亡事件引发了对该物种未来的新关注。WorldView 2卫星的最大分辨率为50厘米，在光谱的远蓝色部分有一个穿透海水的海岸带，使其能够看到更深的水柱。使用覆盖113平方公里的图像，我们确定了55个可能的鲸鱼和23个可能是鲸鱼的其他特征，还有13个仅由海岸带检测到的物体。一些分类技术的比较，自动检测鲸鱼样物体，表明一个简单的阈值技术的全色和海岸带提供了最好的结果。这是第一个成功的研究使用卫星图像来计数鲸鱼;一个实用的，可转移的方法使用这种快速发展的技术，对未来的调查鲸目动物种群的重大影响。
We describe a method of identifying and counting whales using very high resolution satellite imagery through the example of southern right whales breeding in part of the Golfo Nuevo, Península Valdés in Argentina. Southern right whales have been extensively hunted over the last 300 years and although numbers have recovered from near extinction in the early 20th century, current populations are fragmented and are estimated at only a small fraction of pre-hunting total. Recent extreme right whale calf mortality events at Península Valdés, which constitutes the largest single population, have raised fresh concern for the future of the species. The WorldView2 satellite has a maximum 50 cm resolution and a water penetrating coastal band in the far-blue part of the spectrum that allows it to see deeper into the water column. Using an image covering 113 km2, we identified 55 probable whales and 23 other features that are possibly whales, with a further 13 objects that are only detected by the coastal band. Comparison of a number of classification techniques, to automatically detect whale-like objects, showed that a simple thresholding technique of the panchromatic and coastal band delivered the best results. This is the first successful study using satellite imagery to count whales; a pragmatic, transferable method using this rapidly advancing technology that has major implications for future surveys of cetacean populations.
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影响因子：
13.5
作者：
Ferrari, GM;Hoepffner, N;Mingazzini, M
通讯作者：
Mingazzini, M
DOI：
10.1016/j/dsr2.2004.06.008
发表时间：
2004-01-01
影响因子：
3
作者：
Reilly, S;Hedley, S;Naganobu, M
通讯作者：
Naganobu, M
影响因子：
1.7
作者：
LaRue, Michelle A.;Rotella, Jay J.;Morin, Paul J.
通讯作者：
Morin, Paul J.
影响因子：
6.4
作者：
Fretwell, Peter T.;Trathan, Philip N.
通讯作者：
Trathan, Philip N.
影响因子：
3.4
作者：
Patra, Swarnajyoti;Ghosh, Susmita;Ghosh, Ashish
通讯作者：
Ghosh, Ashish