Estimation of Chlorophyll Content in Winter Wheat Based on UAV Hyperspectral

Hai-kuan FENG; Hui-lin TAO; Yu ZHAO; Fu-qin YANG; Yi-guang FAN; Gui-jun YANG

doi:10.3964/j.issn.1000-0593(2022)11-3575-06

Spectroscopy and Spectral Analysis, Volume. 42, Issue 11, 3575(2022)

Estimation of Chlorophyll Content in Winter Wheat Based on UAV Hyperspectral

Hai-kuan FENG^1、*, Hui-lin TAO^1、1;, Yu ZHAO^1、1;, Fu-qin YANG^3、3;, Yi-guang FAN^1、1;, and Gui-jun YANG^{1、1; *;}

¹1. Key Laboratory of Quantitative Remote Sensing in Agriculture of Ministry of Agriculture and Rural Affairs, Information Technology Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

³3. College of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China

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Figures & Tables(9)

Fig. 1. Test area location and design

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Fig. 2. Model validation results in estimation of SPAD based on vegetation indices

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Fig. 3. Model validation results in estimation of SPAD based on vegetation indices combined with red edge parameters

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Fig. 4. Spatial distribution of SPAD in three growth stages

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Table 1. Selected vegetation indices in this study

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Table 1. Selected vegetation indices in this study

光谱参数	公式	参考文献
LCI	(R₈₅₀-R₇₁₀)/(R₈₅₀+R₆₇₀)¹^/²	[10]
PBI	R₈₁₀/R₅₆₀	[10]
NDVI	(R₈₀₀-R₆₈₀)/(R₈₀₀+R₆₈₀)	[10]
SR	R₇₅₀/R₅₅₀	[10]
TCARI	3×[(R₇₀₀-R₆₇₀)-0.2×(R₇₀₀-R₅₅₀)(R₇₀₀/R₆₇₀)]	[10]
OSAVI	1.16×(R₈₀₀-R₆₇₀)/(R₈₀₀+R₆₇₀+0.16)	[10]
GNDVI	(R₈₀₁-R₅₅₀)/(R₈₀₁+R₅₅₀)	[11]

Table 2. Correlation coefficients between vegetation indices, red edge parameters and SPAD

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Table 2. Correlation coefficients between vegetation indices, red edge parameters and SPAD

参数	相关系数
参数	拔节期	挑旗期	开花期
LCI	0.745^**	0.598^**	0.525^**
PBI	0.718^**	0.553^**	0.502^**
NDVI	0.701^**	0.530^**	0.441^**
SR	0.670^**	0.494^**	0.404^**
TCARI	-0.085	-0.384^**	-0.204
OSAVI	0.655^**	0.514^**	0.439^**
GNDVI	0.744^**	0.589^**	0.539^**
Dr	0.521^**	0.443^**	0.436^**
SDr	0.269^*	0.410^**	0.390^**
Dr_min	-0.445^**	-0.548^**	-0.370^**
Dr/Dr_min	0.696^**	0.626^**	0.428^**

Table 3. Modelling results with single-parameter

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Table 3. Modelling results with single-parameter

生育期	参数	R²	RMSE	NRMSE/%
拔节期	LCI	0.56	2.96	8.14
	PBI	0.51	3.09	8.50
	NDVI	0.49	3.16	8.70
	GNDVI	0.55	2.96	8.15
	Dr	0.27	3.78	10.41
	Dr/Dr_min	0.49	3.18	8.76
挑旗期	LCI	0.36	4.09	10.18
	PBI	0.31	4.25	10.59
	NDVI	0.28	4.33	10.78
	GNDVI	0.35	4.13	10.27
	Dr	0.20	4.58	11.39
	Dr/Dr_min	0.39	3.98	9.91
开花期	LCI	0.28	4.61	10.43
	PBI	0.25	4.68	10.60
	NDVI	0.19	4.86	11.00
	GNDVI	0.29	4.56	10.32
	Dr	0.19	4.87	11.03
	Dr/Dr_min	0.18	4.89	11.08

Table 4. Estimation of SPAD based on vegetation indices
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Table 4. Estimation of SPAD based on vegetation indices
生育期建模集验证集
R² RMSE NRMSE/% R² RMSE NRMSE/%
拔节期 0.62 2.67 7.43 0.65 3.27 8.80
挑旗期 0.70 2.53 6.57 0.72 3.15 8.13
开花期 0.73 2.49 5.57 0.76 3.09 7.93

Table 5. Estimation of SPAD based on vegetation indices combined with red edge parameters
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Table 5. Estimation of SPAD based on vegetation indices combined with red edge parameters
生育期建模集验证集
R² RMSE NRMSE/% R² RMSE NRMSE/%
拔节期 0.64 2.61 7.27 0.68 3.17 8.53
挑旗期 0.71 2.50 6.44 0.74 3.11 8.05
开花期 0.78 2.22 4.95 0.81 3.02 7.62

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Hai-kuan FENG, Hui-lin TAO, Yu ZHAO, Fu-qin YANG, Yi-guang FAN, Gui-jun YANG. Estimation of Chlorophyll Content in Winter Wheat Based on UAV Hyperspectral[J]. Spectroscopy and Spectral Analysis, 2022, 42(11): 3575

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