Designing optimal spectral indices: a feasibility and proof of concept study
Designing optimal spectral indices: a feasibility and proof of concept study
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DOI：
10.1080/014311699212524
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发表时间：
1999-06-15
影响因子：
3.4
通讯作者：
Gobron, N
中科院分区：
文献类型：
--
作者：
Govaerts, YM;Verstraete, MM;Gobron, N
植被指数是从卫星遥感数据中提取有用信息的一种简便方法，但其设计必须满足具体应用的需要并利用特定仪器的特点。两个因素促使更好的光谱指数的发展在这个时候。第一个是即将到来的新一代先进地球观测传感器，如环境卫星上的中分辨率成像光谱仪、SPOT-4平台上的VEGETATION仪器和ADEOS II上的GLI等。第二是最近发表了关于设计和评价最佳光谱指数的方法论文。本文件介绍了为监测陆地植被状况而优化的光谱指数的定义方面取得的初步结果，其中植物冠层中吸收的光合有效辐射的比例被认为是关键的可观测物理过程。MERIS仪器的规格被用作示例，但该方法可以扩展到其他传感器。这些结果是令人鼓舞的，并显示了利用新仪器的先进特性来满足特定应用需求的定义最佳指数的可行性。
Vegetation indices constitute a simple and convenient approach to extract useful information from satellite remote sensing data, provided they are designed to address the needs of specific applications and take advantage of the characteristics of particular instruments. Two factors motivate the development of better spectral indices at this time. The first one is the upcoming arrival of a new generation of advanced Earth observation sensors such as the Medium Resolution Imaging Spectrometer (MERIS) on Envisat, the VEGETATION instrument on the SPOT-4 platform, and GLI on ADEOS II, among others. The second is the recent publication of methodological papers on the design and evaluation of optimal spectral indices. The present contribution describes preliminary results obtained in the definition of a spectral index optimized to monitor the state of terrestrial vegetation, where the fraction of absorbed photosynthetically active radiation in plant canopies is considered the key observable physical process. The specifications of the MERIS instrument are used as an example, but the approach can be extended to other sensors. These results are encouraging and show the feasibility of defining optimal indices that exploit advanced characteristics of new instruments to meet the needs of specific applications.