基于高光谱多尺度分解的土壤含水量反演 下载: 1258次
Inversion of Soil Moisture Content Based on Hyperspectral Multi-Scale Decomposition
1 新疆大学资源与环境科学学院智慧城市与环境建模自治区普通高校重点实验室, 新疆 乌鲁木齐 830046
2 新疆大学绿洲生态教育部重点实验室, 新疆 乌鲁木齐 830046
图 & 表
图 1. 野外样点分布
Fig. 1. Distribution of field samping points
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图 2. 小波变换1~8层重构光谱
Fig. 2. Reconstruction spectra of original spectrum at 1-8 wavelet levels
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图 3. 实测值与估算值的比较
Fig. 3. Comparison between measured and predicted SMC values
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表 1土壤样品SMC统计特征
Table1. Statistical characteristics of SMC in soil samples
Sampleset | Number ofsamples | Meanvalue | Standarddeviation | Maximumvalue | Minimumvalue | CV |
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Whole set | 39 | 0.147 | 0.057 | 0.339 | 0.015 | 0.388 | Calibration set | 27 | 0.146 | 0.050 | 0.211 | 0.020 | 0.342 | Validation set | 12 | 0.148 | 0.084 | 0.339 | 0.015 | 0.568 |
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表 2SMC与各层特征光谱的相关分析
Table2. Correlation analysis between SMC and characteristic spectrum in each level
Waveletlevel | Number ofsensitive band | Maximum positive correlation | Maximum negative correlation |
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Band /nm | Correlationcoefficient | Band /nm | Correlationcoefficient |
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L1 | 393 | 852 | 0.610 | 2350 | -0.714 | L2 | 402 | 854 | 0.561 | 2351 | -0.620 | L3 | 429 | 860 | 0.618 | 2364 | -0.690 | L4 | 486 | 853 | 0.619 | 2363 | -0.675 | L5 | 505 | 849 | 0.585 | 2341 | -0.648 | L6 | 602 | 858 | 0.557 | 2351 | -0.573 | L7 | 278 | 524 | 0.458 | 1985 | -0.486 | L8 | 254 | 438 | 0.382 | 1827 | -0.431 |
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表 3SMC与各层特征光谱的不同数学变换的最大相关性及其波段所处位置
Table3. Maximum correlation between SMC and different mathematical transformation of characteristic spectrum of each level and position of band
Waveletlevel | Variable | R | lg R | 1/R | lg(1/R) | 1/(lg R) | R' | (lg R)' | (1/R)' | [lg(1/R)]' | (1/lg R)' |
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L0 | Band /nm | 2229 | 2244 | 2190 | 2243 | 2165 | 407 | 409 | 407 | 407 | 831 | r | -0.724 | 0.729 | 0.584 | -0.729 | -0.667 | -0.728 | -0.757 | -0.685 | -0.739 | 0.685 | L1 | Band /nm | 2244 | 2244 | 2286 | 2194 | 2186 | 407 | 1199 | 407 | 407 | 1199 | r | -0.723 | 0.728 | 0.784 | -0.728 | -0.667 | -0.780 | -0.762 | 0.792 | -0.792 | -0.662 | L2 | Band /nm | 1924 | 2242 | 2186 | 2242 | 2171 | 488 | 768 | 2155 | 1417 | 2147 | r | -0.548 | 0.728 | 0.583 | -0.728 | -0.667 | -0.686 | -0.735 | -0.726 | -0.699 | -0.582 | L3 | Band /nm | 1962 | 2147 | 2182 | 2134 | 2161 | 1951 | 1760 | 2174 | 2160 | 1860 | r | -0.560 | 0.762 | 0.621 | -0.762 | -0.707 | -0.669 | 0.758 | -0.760 | -0.682 | -0.624 | L4 | Band /nm | 2196 | 2191 | 2184 | 2191 | 2104 | 2157 | 1761 | 2177 | 1877 | 1761 | r | -0.723 | 0.728 | 0.582 | -0.728 | -0.666 | -0.680 | 0.761 | -0.757 | 0.757 | -0.602 | L5 | Band /nm | 2197 | 2197 | 2192 | 2109 | 2197 | 1953 | 1874 | 2172 | 2172 | 1773 | r | -0.724 | 0.729 | 0.583 | -0.729 | -0.668 | -0.725 | 0.758 | -0.746 | 0.746 | -0.597 | L6 | Band /nm | 2144 | 2136 | 2201 | 2140 | 2107 | 1441 | 1780 | 2262 | 2262 | 1780 | r | -0.722 | 0.728 | 0.582 | -0.728 | -0.665 | -0.676 | 0.753 | -0.743 | 0.743 | -0.560 |
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表 4各层特征光谱不同数学变换的灰色关联分析
Table4. Gray relational analysis of different mathematical transformation of characteristic spectrum of each level
Waveletlevel | Item | R | lg R | 1/R | Lg (1/R) | 1/lg R | R' | (lg R)' | (1/R)' | [lg(1/R)]' | (1/lg R)' |
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L0 | GCD | 0.700 | 0.747 | 0.819 | 0.750 | 0.786 | 0.806 | 0.851 | 0.839 | 0.775 | 0.815 | Order | 10 | 9 | 3 | 8 | 6 | 5 | 1 | 2 | 7 | 4 | L1 | GCD | 0.805 | 0.858 | 0.898 | 0.800 | 0.799 | 0.870 | 0.887 | 0.955 | 0.890 | 0.881 | Order | 9 | 7 | 2 | 8 | 10 | 6 | 4 | 1 | 3 | 5 | L2 | GCD | 0.753 | 0.796 | 0.824 | 0.772 | 0.808 | 0.868 | 0.881 | 0.870 | 0.831 | 0.867 | Order | 9 | 8 | 6 | 10 | 7 | 3 | 1 | 2 | 5 | 4 | L3 | GCD | 0.759 | 0.819 | 0.823 | 0.755 | 0.865 | 0.821 | 0.916 | 0.842 | 0.833 | 0.887 | Order | 9 | 8 | 6 | 10 | 3 | 7 | 1 | 4 | 5 | 2 | L4 | GCD | 0.788 | 0.800 | 0.862 | 0.875 | 0.809 | 0.884 | 0.895 | 0.893 | 0.892 | 0.842 | Order | 10 | 9 | 6 | 5 | 8 | 4 | 1 | 2 | 3 | 7 | L5 | GCD | 0.745 | 0.831 | 0.827 | 0.803 | 0.806 | 0.818 | 0.881 | 0.835 | 0.873 | 0.867 | Order | 10 | 5 | 6 | 9 | 8 | 7 | 1 | 4 | 2 | 3 | L6 | GCD | 0.770 | 0.828 | 0.870 | 0.779 | 0.787 | 0.815 | 0.903 | 0.889 | 0.856 | 0.816 | Order | 10 | 5 | 3 | 9 | 8 | 6 | 1 | 2 | 4 | 7 |
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表 5SMC预测结果
Table5. Estimation results of SMC
Variable selectionmethod | Number ofvariable | Calibration set | Validation set |
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R2c | eRMSEC | | eRMSEP | eRPD |
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L0 | 10 | 0.750 | 0.024 | 0.926 | 0.045 | 1.867 | L1 | 10 | 0.769 | 0.023 | 0.912 | 0.042 | 2.000 | L2 | 10 | 0.692 | 0.027 | 0.890 | 0.035 | 2.400 | L3 | 10 | 0.748 | 0.024 | 0.884 | 0.033 | 2.545 | L4 | 10 | 0.670 | 0.053 | 0.875 | 0.034 | 2.471 | L5 | 10 | 0.675 | 0.028 | 0.872 | 0.049 | 1.714 | L6 | 10 | 0.672 | 0.028 | 0.911 | 0.032 | 2.625 | L-GRA | 12 | 0.710 | 0.026 | 0.965 | 0.030 | 2.800 |
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蔡亮红, 丁建丽. 基于高光谱多尺度分解的土壤含水量反演[J]. 激光与光电子学进展, 2018, 55(1): 013001. Cai Lianghong, Ding Jianli. Inversion of Soil Moisture Content Based on Hyperspectral Multi-Scale Decomposition[J]. Laser & Optoelectronics Progress, 2018, 55(1): 013001.