Spectroscopy and Spectral Analysis, Volume. 41, Issue 9, 2911(2021)
Leaf Nitrogen Concentration Retrieval Based on Polarization Reflectance Model and Random Forest Regression
Figures & Tables(8)
Fig. 1. Spatial distribution of foliar nitrogen content retrieval plot
Fig. 3. Ratio of PBRF to BRF
In this figure, the × in the box represents the mean value, and the transverse line in the box represents the median value
Table 1. IGBP classes of dominant vegetation in Bavarian Forest National Park
View tableView in ArticleTable 1. IGBP classes of dominant vegetation in Bavarian Forest National Park
树种 IGBP类别 类名 欧洲云杉 IGBP01 常绿针叶林 欧洲山毛榉 IGBP04 落叶阔叶林 欧洲冷杉 IGBP01 常绿针叶林 假挪威槭 IGBP04 落叶阔叶林 欧洲花楸 IGBP04 落叶阔叶林
Table 2. Formulas of 5 BPDF models
View tableView in ArticleTable 2. Formulas of 5 BPDF models
模型名称 公式 应用场景 自由参数 Nadal模型 森林、 灌木林和低植被地表覆盖类型 A, B Waquet模型 [其中,S(θ)为后向散射中最大值的遮蔽函数] 森林、 作物种植地和城市地表覆盖类别 A, B Maignan模型 植被地表覆盖类型 A Litvinov模型 [其中,$f(B,{θ}_{H}) $表征的是地表在空间中的高斯分布,S(γ,C)是遮蔽函数] 植被和土壤地表覆盖类型 A, B, C Diner模型 草地地表覆盖类型 A
Table 3. Accuracy assessment of 5 BPDF models on IGBP01/04/05
View tableView in ArticleTable 3. Accuracy assessment of 5 BPDF models on IGBP01/04/05
类别 Nadal模型 Waquet模型 Maignan模型 Litvinov模型 Diner模型 RSQ RMSE RSQ RMSE RSQ RMSE RSQ RMSE RSQ RMSE IGBP01 0.697 0.003 0.690 0.003 0.695 0.003 0.688 0.003 0.655 0.003 IGBP04 0.875 0.002 0.857 0.002 0.871 0.002 0.878 0.002 0.821 0.002 IGBP05 0.812 0.002 0.789 0.002 0.818 0.002 0.808 0.002 0.759 0.002
Table 4. RF algorithm accuracy assessment of different estimator numbers
View tableView in ArticleTable 4. RF algorithm accuracy assessment of different estimator numbers
决策树
数量去偏前 去偏后 RSQ RMSE RSQ RMSE 5 0.722 0.307 0.747 0.300 10 0.769 0.290 0.803 0.252 50 0.732 0.303 0.746 0.292 100 0.720 0.309 0.729 0.303
Table 5. Accuracy assessment of 5 LNC retrieval algorithms
View tableView in ArticleTable 5. Accuracy assessment of 5 LNC retrieval algorithms
算法名称 去偏前 去偏后 RSQ RMSE RSQ RMSE PLSR 0.595 0.373 0.624 0.359 PCR 0.678 0.329 0.680 0.328 SVR 0.732 0.304 0.735 0.302 KNN 0.748 0.291 0.748 0.291 RF 0.769 0.290 0.803 0.252
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Zi-han ZHANG, Lei YAN, Si-yuan LIU, Yu FU, Kai-wen JIANG, Bin YANG, Sui-hua LIU, Fei-zhou ZHANG. Leaf Nitrogen Concentration Retrieval Based on Polarization Reflectance Model and Random Forest Regression[J]. Spectroscopy and Spectral Analysis, 2021, 41(9): 2911
Paper Information
Category: Research Articles
Received: Sep. 26, 2020
Accepted: --
Published Online: Oct. 29, 2021
The Author Email: ZHANG Zi-han (zzh_cytus@pku.edu.cn)
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