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首页> 外文期刊>Estuarine Coastal and Shelf Science >Detecting coral bleaching, using QuickBird multi-temporal data: A feasibility study at Kish Island, the Persian Gulf
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Detecting coral bleaching, using QuickBird multi-temporal data: A feasibility study at Kish Island, the Persian Gulf

机译：使用QuickBird多时相数据检测珊瑚褪色：在波斯湾基什岛进行的可行性研究

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摘要

Coral bleaching events have become more frequent and intense worldwide and speculated to be a severe threat for coral survival in future. The Persian Gulf, as one of the warmest seas, has also experienced coral mortalities and bleaching events. Historically, bleaching events are known to occur south of the Persian Gulf, such information is scarce in the northern side. Perhaps remoteness and inaccessibility to Iran main coral communities which have developed on offshore islands can explain such lack of data. To address this issue, the feasibility of using multi-temporal satellite images for detecting past bleaching events were investigated. Two QuickBird images (2005, 2008) were selected to detect 2007 bleaching event at Kish Island, Iran, and the accuracy of results were compared to in situ observations. Current study might represent "algae-challenged" scenario in terms of having 7 months' time lapse between bleaching event and post-bleaching satellite image. As a result of this, we had algae-covered corals instead of white bleached corals. In the proposed procedure pre and post-bleaching images were classified, and changes in reflectance values within coral classes were interpreted as bleaching areas. By using this method we could eliminate the effect of miss-classification between bleached corals and sand; as well as algae-covered corals and live corals. Furthermore, it is not necessary to have a post-bleaching image acquired during bleaching events, although having such image will increase the accuracy. The proposed technique detected ～28% of bleached corals and the results support the idea that coral bleaching can be distinguished by detecting the changes in reflectance values in pre and post-bleaching images. Understanding the occurrence, severity, and extent of past bleaching events may help us understand the population dynamics of Iran corals and reveal coral connectivity patterns in the Persian Gulf.
机译：在世界范围内，珊瑚漂白事件变得更加频繁和激烈，并被认为是对未来珊瑚生存的严重威胁。波斯湾是最温暖的海洋之一，也经历过珊瑚死亡和漂白事件。从历史上看，漂白事件发生在波斯湾的南部，而在北侧这种信息很少。也许在离岛上发展起来的伊朗主要珊瑚群落的偏远和无法进入可以解释这种缺乏数据的原因。为了解决这个问题，研究了使用多时相卫星图像检测过去的漂白事件的可行性。选择了两张QuickBird图像（2005年，2008年）来检测2007年伊朗基什岛的漂白事件，并将结果的准确性与现场观测结果进行了比较。就漂白事件和漂白后卫星图像之间有7个月的时间间隔而言，当前的研究可能代表了“藻类挑战”方案。结果，我们有了藻类覆盖的珊瑚，而不是白色的漂白珊瑚。在提出的程序中，对漂白前后的图像进行了分类，并且将珊瑚类别内反射率值的变化解释为漂白区域。通过使用这种方法，我们可以消除漂白的珊瑚和沙子之间遗漏分类的影响。以及藻类覆盖的珊瑚和活珊瑚。此外，虽然具有这样的图像将提高准确性，但是不必具有在漂白事件期间获取的漂白后图像。所提出的技术可检测到约28％的漂白珊瑚，结果支持这样的想法，即可以通过检测漂白前后图像的反射率值的变化来区分珊瑚漂白。了解过去漂白事件的发生，严重程度和程度可能有助于我们了解伊朗珊瑚的种群动态，并揭示波斯湾中珊瑚的连通性模式。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2013年第20期|273-281|共9页
  • 作者

    Keivan Kabiri; Biswajeet Pradhan; Kaveh Samimi-Namin; Masoud Moradi;

  • 作者单位

    Department of Civil Engineering, Faculty of Engineering, Ceospatial Science Information Research Center (CISRC), University Putra Malaysia, 43400 Serdang, Malaysia,Department of Satellite Oceanography, Iranian National Institute for Oceanography, P.O. Box 14155-4781, Tehran, Iran;

    Department of Civil Engineering, Faculty of Engineering, Ceospatial Science Information Research Center (CISRC), University Putra Malaysia, 43400 Serdang, Malaysia;

    Department of Marine Zoology, Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden, The Netherlands;

    ,Department of Satellite Oceanography, Iranian National Institute for Oceanography, P.O. Box 14155-4781, Tehran, Iran;

    Department of Satellite Oceanography, Iranian National Institute for Oceanography, P.O. Box 14155-4781, Tehran, Iran;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    coral reefs; bleaching; multi-temporal satellite images; remote sensing; persian gulf; kish island;

    机译：珊瑚礁;漂;多时相卫星图像;遥感;波斯湾;基什岛;

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