Spectral discrimination of healthy and non-healthy corals based on cluster analysis, principal components analysis, and derivative spectroscopy
Spectral discrimination of healthy and non-healthy corals based on cluster analysis, principal components analysis, and derivative spectroscopy
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DOI：
10.1016/s0034-4257(98)00029-7
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发表时间：
1998-08-01
影响因子：
13.5
通讯作者：
LeDrew, E
中科院分区：
文献类型：
--
作者：
Holden, H;LeDrew, E
全球大规模珊瑚白化的报告是主要关注点，位这些报告的科学依据是值得怀疑的。珊瑚健康没有客观的衡量标准，因此，个人对单个梳子头或整个珊瑚礁的苍白程度的看法是珊瑚漂白报告的基础。人们普遍认为，珊瑚白化是由于单个水螅体内的藻类被驱逐或减少，从而导致珊瑚失去颜色。卫星或航空遥感可能是一个可行的手段映射和监测珊瑚礁在大的地理区域，如果定量？可以开发远程确定珊瑚健康状况的手段。为了远程检测COML应力，用手持式分光辐射计测量了健康和漂白的斐济石珊瑚梳的原位光谱反射率。主成分和聚类分析表明，有一个健康和漂白的珊瑚主要是基于反射率的大小的光谱区分。光谱导数分析用于确定理想的远程识别基板类型的特定波长区域。这些结果令人鼓舞，有助于使用航空分光辐射计确定漂白珊瑚的区域，从而能够进行准确的监测。随着时间(C)Elsevier Science Inc.，1998.
Report of global mass coral bleaching are of major concern, bit the scientific basis of these reports is questionable. There exists no objective measure of coral health, so that individual perceptions of the paleness of an individual comb head or an entire coral reef, a-e the foundation of coral bleaching reports. It is uncle-stood that coral blenching results from an expulsion or reduction of the algae housed in the individual polyp, which causes the cor-nl to lose its color. Satellite or airborne remote sensing may be a feasible means of mapping and monitoring cor-al reefs over large geographic areas if a quantitative ?means of remotely determining coral health can be developed. In an effort to remotely detect co ml stress, in.situ spectral rflectance of healthy and bleached Fijian scleractinian combs was measured with a handheld spectroradiometer. Principal components and cluster analysis revealed that there is a spectral distinction between healthy and bleached cor-al based largely on magnitude of reflectance. Spectral derivative analysis was used to determine the specific wavelength regions ideal for remote identification of substrate type. These results are encouraging with respect to using an airborne spectroradiometer to identify areas of bleached corals thus enabling accurate monitoring. over time. (C) Elsevier Science Inc., 1998.