Spectroscopy and Spectral Analysis, Volume. 42, Issue 4, 1092(2022)
Hyperspectral Inversion Model for SPAD of Rice Leaves Based on Optimized Spectral Index
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Fig. 2. Reconstructed reflectance spectra of L1-L6 layers by wavelet analysis
Fig. 3. Isopotential diagram of correlation coefficient between optimized and transformed spectral indices and SPAD of rice leaves
Fig. 4. Scatter plots of prediction results
(a): PLSR; (b): SVM; (c): BP
Table 1. Eight common dual wavelength spectral indices and their linear correlation coefficients with SPAD of rice leaves
View tableView in ArticleTable 1. Eight common dual wavelength spectral indices and their linear correlation coefficients with SPAD of rice leaves
名称 计算公式 皮尔森线性
相关系数RVI R800/R670 0.529 DVI R800-R670 0.593 NDVI (R800-R670)/(R800+R670) 0.618 TVI 0.5[120(R750-R550)-200(R670-R550)] 0.412 GNDVI (R800-R550)/(R800+R550) 0.389 SAVI (1+L)(R800-R670)/(R800+R670+L) 0.574 MCARI (R700-R670)-0.2(R700-R550)(R700/R670) 0.687 MTCI (R750-R710)/(R710-R680) 0.561
Table 2. Inversion results of three modeling methods
View tableView in ArticleTable 2. Inversion results of three modeling methods
建模集 验证集 样本量 R2 NRMSE/% 样本量 R2 NRMSE/% PLSR 40 0.801 7 5.304 2 20 0.826 8 5.213 9 SVM 40 0.793 3 5.279 5 20 0.809 0 5.209 9 BP神经网络 40 0.842 6 5.152 7 20 0.857 0 4.829 9
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Yue YU, Hai-ye YU, Xiao-kai LI, Hong-jian WANG, Shuang LIU, Lei ZHANG, Yuan-yuan SUI. Hyperspectral Inversion Model for SPAD of Rice Leaves Based on Optimized Spectral Index[J]. Spectroscopy and Spectral Analysis, 2022, 42(4): 1092
Paper Information
Category: Research Articles
Received: Mar. 24, 2021
Accepted: --
Published Online: Jul. 25, 2023
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