Estimation Method of VIS-NIR Spectroscopy for Soil Organic Matter Based on Sparse Networks

Si Ran; Jianli Ding; Xiangyu Ge; Bohua Liu; Junyong Zhang

doi:10.3788/LOP57.242803

Laser & Optoelectronics Progress, Volume. 57, Issue 24, 242803(2020)

Estimation Method of VIS-NIR Spectroscopy for Soil Organic Matter Based on Sparse Networks

Si Ran^1,2, Jianli Ding^1,2、*, Xiangyu Ge^1,2, Bohua Liu^1,2, and Junyong Zhang^1,2

Author Affiliations

¹College of Resources & Environmental Science, Xinjiang University, Urumqi, Xinjiang 830046, China;

²Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi, Xinjiang 830046, China

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Figures & Tables(10)

Fig. 1. AE network structure

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Fig. 2. Results of combined method of PCA and Mahalanobis distance to eliminate abnormal samples

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Fig. 3. Reflectance curves of SOM and different VIS-NIR spectra. (a) Original spectrum; (b) first-order spectrum; (c) second-order spectrum

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Fig. 4. Correlation curves of different VIS-NIR spectra and SOM. (a) Original spectrum; (b) first-order spectrum; (c) second-order spectrum

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Fig. 5. PCA eigenvalues and contribution rate

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Fig. 6. RMSE curve of characteristic band

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Fig. 7. SAE network structure and parameters

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Fig. 8. Relationship between variable selection method and R² in SOM

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Table 1. SOM statistics
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Table 1. SOM statistics
Dataset Count Min Middle Max Mean SD CV
Whole dataset 89 0.40 12.56 45.47 13.07 8.08 0.62
Calibration dataset 59 0.40 12.56 45.47 12.67 6.98 0.55
Validation dataset 30 0.56 12.72 42.54 13.84 9.99 0.76

Table 2. Model accuracy of different feature variable selections and modeling methods

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Table 2. Model accuracy of different feature variable selections and modeling methods

Model	Extract variable	Calibration		Prediction
Model	Extract variable	R²	RMSE	R²	RMSE	RPD	RPIQ
PLSR	SPA	0.64	5.02	0.53	5.56	1.47	1.70
	PCA	0.67	4.81	0.61	5.08	1.61	2.09
	SAE	0.66	4.90	0.61	5.23	1.58	2.07
BP	SPA	0.75	4.36	0.71	4.43	1.85	2.21
	PCA	0.80	3.90	0.76	4.08	2.01	2.40
	SAE	0.85	3.38	0.82	3.53	2.32	2.78

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Si Ran, Jianli Ding, Xiangyu Ge, Bohua Liu, Junyong Zhang. Estimation Method of VIS-NIR Spectroscopy for Soil Organic Matter Based on Sparse Networks[J]. Laser & Optoelectronics Progress, 2020, 57(24): 242803

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