Estimation of Soil Organic Carbon Content Based on Spectral Indices and Continuous Wavelet Transform

Mingchong Gong; Hong Wang; Lei Zhang; Jiujun Xiao; Jing Liu; Yandong Chen

doi:10.3788/LOP241216

Laser & Optoelectronics Progress, Volume. 62, Issue 3, 0330005(2025)

Estimation of Soil Organic Carbon Content Based on Spectral Indices and Continuous Wavelet Transform

Mingchong Gong^1、*, Hong Wang¹, Lei Zhang², Jiujun Xiao³, Jing Liu¹, and Yandong Chen¹

Author Affiliations

¹School of Mining, Guizhou University, Guiyang 550025, Guizhou , China

²Institute of Surveying and Mapping, Guizhou Geology and Mineral Exploration Bureau, Guiyang 550018, Guizhou , China

³Guizhou Institute of Mountain Resources, Guizhou Academy of Sciences, Guiyang 550001, Guizhou , China

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Figures & Tables(6)

Fig. 1. Correlation between the original spectrum and SOC content

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Fig. 2. Correlation between SIs and SOC content. (a) DI ; (b) RI; (c) RDI; (d) NDI

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Fig. 3. Correlation between wavelet energy coefficient and SOC content

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$Simulated scatter plots of SOC mass fraction for validation set by 6 models with the highest accuracy. (a) SIs-RF; (b) CWT-RF; (c) SIs+CWT-RF; (d) SIs-BPANN; (e) CWT-BPANN; (f) SIs+CWT-BPANN$

Fig. 4. Simulated scatter plots of SOC mass fraction for validation set by 6 models with the highest accuracy. (a) SIs-RF; (b) CWT-RF; (c) SIs+CWT-RF; (d) SIs-BPANN; (e) CWT-BPANN; (f) SIs+CWT-BPANN

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Table 1. Statistical characteristics of SOC mass fraction in different samples
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Table 1. Statistical characteristics of SOC mass fraction in different samples
Sample type Quantity Mass fraction /（g·kg^-1）
Maximum Minimum Mean Standard deviation
Totality 61 78.40 6.40 13.45 11.00
Calibration 43 78.40 6.40 14.26 11.47
Validation 18 42.30 7.50 14.72 9.96

Table 2. Results of SOC mass fraction estimation models for calibration and validation sets

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Table 2. Results of SOC mass fraction estimation models for calibration and validation sets

Variable	Number of bands or features	Model	Calibration set		Validation set
Variable	Number of bands or features	Model	R²	RMSE /（g·kg^-1）	R²	RMSE /（g·kg^-1）	RPD
OR	2001	SVM	0.74	5.74	0.58	6.25	1.59
		RF	0.78	5.34	0.69	5.40	1.84
		BPANN	0.80	5.04	0.70	5.28	1.89
SIs	20	SVM	0.75	5.65	0.62	5.97	1.67
		RF	0.85	4.42	0.79	4.48	2.23
		BPANN	0.88	3.94	0.82	4.06	2.46
CWT	20	SVM	0.78	5.35	0.63	5.89	1.70
		RF	0.87	4.16	0.80	4.33	2.30
		BPANN	0.98	1.61	0.93	2.48	4.01
SIs+CWT	40	SVM	0.81	4.99	0.65	5.75	1.73
		RF	0.92	3.21	0.88	3.41	3.02
		BPANN	0.98	1.59	0.95	2.13	4.67

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Mingchong Gong, Hong Wang, Lei Zhang, Jiujun Xiao, Jing Liu, Yandong Chen. Estimation of Soil Organic Carbon Content Based on Spectral Indices and Continuous Wavelet Transform[J]. Laser & Optoelectronics Progress, 2025, 62(3): 0330005

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