Analysis of Influencing Factors in Wheat/Maize Canopy RVI and NDVI Acquisition Using Ground-Based Remote Sensing System

Yu-dong ZHENG; Yun-cheng XU; Hai-jun YAN; Yong-jun ZHENG

doi:10.3964/j.issn.1000-0593(2021)08-2578-08

Journals >Spectroscopy and Spectral Analysis >Volume 41 >Issue 8 >Page 2578 > Article

Spectroscopy and Spectral Analysis
Vol. 41, Issue 8, 2578 (2021)

Analysis of Influencing Factors in Wheat/Maize Canopy RVI and NDVI Acquisition Using Ground-Based Remote Sensing System

Yu-dong ZHENG^1、*, Yun-cheng XU^1、1;, Hai-jun YAN^{1、1; *;}, and Yong-jun ZHENG^2、2;

Author Affiliations

¹1. College of Water Resources & Civil Engineering, China Agricultural University, Beijing 100083, China

²2. College of Engineering, China Agricultural University, Beijing 100083, China

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DOI: 10.3964/j.issn.1000-0593(2021)08-2578-08 Cite this Article

Yu-dong ZHENG, Yun-cheng XU, Hai-jun YAN, Yong-jun ZHENG. Analysis of Influencing Factors in Wheat/Maize Canopy RVI and NDVI Acquisition Using Ground-Based Remote Sensing System[J]. Spectroscopy and Spectral Analysis, 2021, 41(8): 2578 Copy Citation Text

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Fig. 1. Observation system and equipment
(a): Observation site; (b): SRS-NDVI sensor;(c): CR300 data collector

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Fig. 2. Schematic diagram of zenith angle θ and azimuth angle φ

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Fig. 3. Daily trend of canopy red light and near infrared reflectance
(a): Wheat; (b): Maize

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Fig. 4. Distribution of canopy red light and near infrared reflectance under different view azimuth angles
(a): Wheat; (b): Maize

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Fig. 5. Distribution of canopy red light and near infrared reflectance under different view zenith angles
(a): Wheat; (b): Maize

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Fig. 6. Daily trend of canopy RVI and NDVI
(a): Wheat; (b): Maize

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Fig. 7. Distribution of canopy RVI and NDVI under different view azimuth angles
(a): Wheat; (b): Maize

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Fig. 8. Distribution of canopy RVI and NDVI under different view zenith angles
(a): Wheat; (b): Maize

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Parameters	θ/(°)	φ/(°)	H/m	t	f/min	v/(m·min^-1)
θ	-60~60	0	1.0	12:00—14:00	60	2
φ	45	0~180	1.0	12:00—14:00	60	2
H	45	0	0.5~2.5	12:00—14:00	60	2
t	45	0	1.0	8:00—18:00	60	2
f	45	0	1.0	12:00—14:00	2~60	2
v	45	0	1.0	12:00—14:00	60	0~4

Table 1. Experimental parameters

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Wheat growth stage		Maize growth stage
Regreening	1.04	V7	0.85
Jointing	2.08	V9	1.95
Heading	2.82	V11	3.09
Flowering	3.60	V12	3.81
Filling	2.33	V14	4.87

Table 2. LAI of wheat and maize in each growth stage

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Parameters	Crop	H	f	v	t	φ	θ
R_RED	Wheat	0.041	0.216	0.091	0.938^**	0.941^**	-0.894^**
R_RED	Maize	0.053	0.105	0.033	0.973^**	0.964^**	-0.970^**
R_NIR	Wheat	0.083	0.111	0.138	0.905^**	0.980^**	-0.944^**
R_NIR	Maize	0.057	0.284	0.142	0.902^**	0.897^**	-0.961^**

Table 3. Correlation coefficient of canopy spectral information and observation conditions

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Crop	Growth stage	LAI	RVI			NDVI
Crop	Growth stage	LAI	t	φ	θ	t	φ	θ
	Regreening	1.04	15%	28%	44%	12%	27%	50%
	Jointing	2.08	24%	27%	39%	12%	15%	17%
Wheat	Heading	2.82	37%	34%	27%	12%	11%	7%
	Flowering	3.60	50%	30%	18%	10%	6%	2%
	Filling	2.33	31%	26%	43%	15%	12%	14%
	V7	0.85	10%	11%	11%	32%	34%	39%
	V9	1.95	19%	15%	19%	36%	25%	31%
Maize	V11	3.09	18%	16%	17%	23%	21%	21%
	V12	3.81	26%	31%	27%	22%	26%	23%
	V14	4.87	33%	32%	29%	22%	20%	18%

Table 4. CV of canopy spectral information under different observation conditions

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Crop	Growth stage	LAI	RVI			NDVI
Crop	Growth stage	LAI	t	φ	θ	t	φ	θ
	Regreening	1.04	0.17	0.51	0.32	0.14	0.56	0.30
	Jointing	2.08	0.27	0.43	0.30	0.28	0.39	0.33
Wheat	Heading	2.82	0.38	0.28	0.34	0.39	0.25	0.36
	Flowering	3.60	0.51	0.18	0.31	0.57	0.12	0.31
	Filling	2.33	0.31	0.43	0.26	0.37	0.34	0.29
	V7	0.85	0.31	0.35	0.34	0.31	0.37	0.32
	V9	1.95	0.36	0.36	0.28	0.39	0.34	0.27
Maize	V11	3.09	0.34	0.34	0.32	0.35	0.33	0.32
	V12	3.81	0.31	0.32	0.37	0.32	0.32	0.36
	V14	4.87	0.35	0.31	0.34	0.36	0.31	0.33

Table 5. Influence weight W of different observation conditions on canopy spectral information

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