Derivation of the red edge index using the MERIS standard band setting
Derivation of the red edge index using the MERIS standard band setting
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DOI：
10.1080/01431160110104647
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发表时间：
2002-08-01
影响因子：
3.4
通讯作者：
Scholte, KH
中科院分区：
文献类型：
--
作者：
Clevers, JGPW;De Jong, SM;Scholte, KH
在欧空局的地球观测计划中，中分辨率成像光谱仪（MERIS）是欧洲极地平台ENVISAT-1的有效载荷组件之一。MERIS将以15个波段的标准波段设置进行操作。本文的目的是研究是否可以从MERIS标准波段设置中导出植被红边指数。这条红边提供了有关植被生理状况的有用信息。探索了两种不同的数据集，利用MERIS光谱波段模拟红边。结果表明，最大一阶导数和三点拉格朗日技术都不是表征红边指数的合适方法。一种“线性方法”，估计拐点作为近红外平台和红色最小值之间的反射率中点，是一种更稳健的方法。结果还表明，MERIS波段位于665、705、753。75和775 nm可以应用线性方法估计红边指数。然而，由于753.75 nm波段的位置非常接近大气的吸氧特征，因此必须在使用MERIS波段计算红边位置之前进行大气校正。
Within ESA's Earth Observation programme, the Medium Resolution Imaging Spectrometer (MERIS) is one of the payload components of the European polar platform ENVISAT-1. MERIS will be operated with a standard band setting of 15 bands. The objective of this paper was to study whether the vegetation red edge index can be derived from the MERIS standard band setting. This red edge provides useful information on the physiological status of the vegetation. Two different data sets are explored for simulating the red edge using MERIS spectral bands. Results show that the maximum first derivative and a three-point Lagrangian technique are not appropriate measures for the red edge index. A 'linear method', estimating the inflexion point as the reflectance midpoint between the NIR plateau and the red minimum, is a more robust method. Results also show that the MERIS bands at 665, 705, 753. 75 and 775 nm can be used for applying the linear method for red edge index estimation. However, since the band at 753.75 nm is located very close to the oxygen absorption feature of the atmosphere, an atmospheric correction must be applied previous to calculating the position of the red edge using the MERIS bands.