Estimating canopy water content using hyperspectral remote sensing data
Estimating canopy water content using hyperspectral remote sensing data
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DOI：
10.1016/j.jag.2010.01.007
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发表时间：
2010-04-01
影响因子：
7.5
通讯作者：
Schaepman, M. E.
中科院分区：
文献类型：
--
作者：
Clevers, J. G. P. W.;Kooistra, L.;Schaepman, M. E.
高光谱遥感表现出了准确检索冠层水含量（CWC）的巨大潜力。该CWC由叶片等效水厚度（EWT）和叶面积指数（LAI）的乘积定义。在本文中，特别是使用建模方法和原位光谱测量测量值研究了冠层吸水特征在970篮板处提供的光谱信息，以估算和预测CWC。使用Prosail辐射转移模型研究了970 nm吸水特征的右斜率上的第一个衍生物与CWC的关系，并在两个测试位点上测试了野外光谱计的测量。第一个地点是一个异质的洪泛区，具有天然植被，例如草和各种灌木。第二个位置是广泛放牧的Fen Meadow.Prosail模拟（使用耦合SAIL/Prospect-5型号）在1015-1050 RIM光谱间隔和CWC（R-2 = 0.97）之间显示出第一个衍生物之间的线性关系。对于洪泛区位点的8个地块，使用ASD fieldSpec光谱计获得的1015-1050 nm间隔内的光谱衍生物用CWC产生的R-2为0.51。对于FEN Meadow ASD FieldSpec光谱测量值的40个地块，在1015-1050 nm的间隔内，衍生物的R-2为0.68。结果的一致性证实了使用模拟结果校准该第一衍生物和CWC之间关系的潜力。 （c）2010 Elsevier B.V.保留所有权利。
Hyperspectral remote sensing has demonstrated great potential for accurate retrieval of canopy water content (CWC). This CWC is defined by the product of the leaf equivalent water thickness (EWT) and the leaf area index (LAI). In this paper, in particular the spectral information provided by the canopy water absorption feature at 970 rim for estimating and predicting CWC was studied using a modelling approach and in situ spectroradiometric measurements. The relationship of the first derivative at the right slope of the 970 nm water absorption feature with CWC was investigated with the PROSAIL radiative transfer model and tested for field spectroradiometer measurements on two test sites. The first site was a heterogeneous floodplain with natural vegetation like grasses and various shrubs. The second site was an extensively grazed fen meadow.PROSAIL simulations (using coupled SAIL/PROSPECT-5 models) showed a linear relationship between the first derivative over the 1015-1050 rim spectral interval and CWC (R-2 = 0.97). For 8 plots at the floodplain site the spectral derivative over the 1015-1050 nm interval obtained with an ASD FieldSpec spectroradiometer yielded an R-2 of 0.51 with CWC. For 40 plots at the fen meadow ASD FieldSpec spectral measurements yielded an R-2 of 0.68 for the derivative over the 1015-1050 nm interval with CWC. Consistency of the results confirmed the potential of using simulation results for calibrating the relationship between this first derivative and CWC. (C) 2010 Elsevier B.V. All rights reserved.