Spectral Characteristics of Oasis Soil in Arid Area Based on Harmonic Analysis Algorithm

Zipeng Zhang; Jianli Ding; Jingzhe Wang

doi:10.3788/AOS201939.0228003

Acta Optica Sinica, Volume. 39, Issue 2, 0228003(2019)

Spectral Characteristics of Oasis Soil in Arid Area Based on Harmonic Analysis Algorithm

Zipeng Zhang^1,2,3、*, Jianli Ding^1,2,3、*, and Jingzhe Wang^1,2,3

Author Affiliations

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

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

³ Key Laboratory of Smart City and Environment Modelling of Higher Education Institute, Xinjiang University, Urumqi, Xinjiang 830046, China

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Figures & Tables(14)

Fig. 1. Research area sampling chart

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Fig. 2. Flow chart of SOM content estimation

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Fig. 3. Correlation curves of original spectrum, FD spectrum and SOM content

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Fig. 4. Correlation coefficient diagrams of harmonic component and SOM content at different HA times. (a)(e)(i)(m) Correlation coefficient of At and SOM content; (b)(f)(j)(n) correlation coefficient of Bt and SOM content; (c)(g)(k)(o) correlation coefficient of Ct and SOM content; (d)(h)(l)(p) correlation coefficient of φt and SOM content

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Fig. 5. Technology roadmap of GA-BP neural network

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Fig. 6. Changing curve of optimal individual fitness

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Fig. 7. Measured and estimated SOM content for different models. (a) MLR model; (b) BP model; (c) GA-BP model

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Table 1. Statistical characteristics of SOM content

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Table 1. Statistical characteristics of SOM content

Type of samples	Number of sample	SOM content (mass fraction) /10^-3			Standard deviation /10^-3	Coefficient of variation /%
Type of samples	Number of sample	Minimum	Maximum	Mean	Standard deviation /10^-3	Coefficient of variation /%
Whole set	101	2.32	18.06	10.94	3.45	31.51
Calibration set	71	3.68	18.06	10.91	3.45	31.61
Validation set	30	2.32	16.45	11.04	3.51	31.79

Table 2. Statistical characteristics of correlation coefficients between At and SOM content at different HA times

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Table 2. Statistical characteristics of correlation coefficients between At and SOM content at different HA times

Harmonic decomposition times	Maximum positive correlation coefficient	Harmonic characteristic component	Maximum negative correlation coefficient	Harmonic characteristic component
500	0.57	7	-0.54	1
1000	0.57	7	-0.54	1
1500	0.57	7	-0.54	1
2000	0.57	7,1993	-0.54	1,1999
2500	0.57	7,1993,2007	-0.54	1,1999,2001
3000	0.57	7,1993,2007	-0.54	1,1999,2001
3500	0.57	7,1993,2007	-0.54	1,1999,2001
4000	0.57	7,1993,2007,3993	-0.54	1,1999,2001,3999

Table 3. Statistical characteristics of correlation coefficient between Bt and SOM content at different HA times

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Table 3. Statistical characteristics of correlation coefficient between Bt and SOM content at different HA times

Harmonic decomposition times	Maximum positive correlation coefficient	Harmonic characteristic component	Maximum negative correlation coefficient	Harmonic characteristic component
500	0.54	21	-0.51	4
1000	0.54	21	-0.51	4
1500	0.54	21	-0.51	4
2000	0.54	21	-0.51	1979
2500	0.54	21,2021	-0.51	1979
3000	0.54	21,2021	-0.51	1979
3500	0.54	21,2021	-0.51	1979
4000	0.54	21,2021	-0.51	1979,3979

Table 4. Statistical characteristics of correlation coefficient between Ct and SOM content at different HA times

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Table 4. Statistical characteristics of correlation coefficient between Ct and SOM content at different HA times

Harmonic decomposition times	Maximum positive correlation coefficient	Harmonic characteristic component	Maximum negative correlation coefficient	Harmonic characteristic component
500	0.47	1	-0.56	6
1000	0.47	1	-0.56	6
1500	0.47	1	-0.56	6
2000	0.47	1,1999	-0.56	6,1994
2500	0.47	1,1999,2001	-0.56	6,1994,2006
3000	0.47	1,1999,2001	-0.56	6,1994,2006
3500	0.47	1,1999,2001	-0.56	6,1994,2006
4000	0.47	1,1999,2001,3999	-0.56	6,1994,2006,3994

Table 5. Statistical characteristics of correlation coefficient between φt and SOM content at different HA times

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Table 5. Statistical characteristics of correlation coefficient between φt and SOM content at different HA times

Harmonic decomposition times	Maximum positive correlation coefficient	Harmonic characteristic component	Maximum negative correlation coefficient	Harmonic characteristic component
500	0.30	68	-0.30	20
1000	0.30	68	-0.32	532
1500	0.30	68	-0.32	532
2000	0.32	1468	-0.32	532
2500	0.32	1468	-0.32	532
3000	0.32	1468	-0.32	532,2532
3500	0.32	1468,3468	-0.32	532,2532
4000	0.32	1468,3468	-0.32	532,2532

Table 6. Characteristic value of PCA and variance contribution rate

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Table 6. Characteristic value of PCA and variance contribution rate

Principle component	Characteristic value	Variance contribution /%	Accumulative contribution /%
PCA1	16.33	77.80	77.80
PCA2	1.45	6.91	84.71
PCA3	1.09	5.19	89.90
PCA4	0.91	4.34	94.24
PCA5	0.52	2.58	96.82
PCA6	0.26	1.43	98.25
PCA7	0.16	0.88	99.13
…	…	…	…
PCA21	-3.13×10^-16	-1.49×10^-15	100

Table 7. Accuracy statistical results of different estimate models
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Table 7. Accuracy statistical results of different estimate models
Validation model R² RMSEP /10^-3 RPD
MLR 0.77 4.76 1.59
BP 0.87 4.07 1.85
GA-BP 0.92 3.92 1.93

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Zipeng Zhang, Jianli Ding, Jingzhe Wang. Spectral Characteristics of Oasis Soil in Arid Area Based on Harmonic Analysis Algorithm[J]. Acta Optica Sinica, 2019, 39(2): 0228003

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Paper Information

Category: Remote Sensing and Sensors

Received: Aug. 13, 2018

Accepted: Oct. 8, 2018

Published Online: May. 10, 2019

The Author Email:

DOI:10.3788/AOS201939.0228003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Statistical characteristics of SOM content

Table 1. Statistical characteristics of SOM content

Table 2. Statistical characteristics of correlation coefficients between At and SOM content at different HA times

Table 2. Statistical characteristics of correlation coefficients between At and SOM content at different HA times

Table 3. Statistical characteristics of correlation coefficient between Bt and SOM content at different HA times

Table 3. Statistical characteristics of correlation coefficient between Bt and SOM content at different HA times

Table 4. Statistical characteristics of correlation coefficient between Ct and SOM content at different HA times

Table 4. Statistical characteristics of correlation coefficient between Ct and SOM content at different HA times

Table 5. Statistical characteristics of correlation coefficient between φt and SOM content at different HA times

Table 5. Statistical characteristics of correlation coefficient between φt and SOM content at different HA times

Table 6. Characteristic value of PCA and variance contribution rate

Table 6. Characteristic value of PCA and variance contribution rate

Table 7. Accuracy statistical results of different estimate models

Table 7. Accuracy statistical results of different estimate models