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

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 11 >Page 3575 > Article

Spectroscopy and Spectral Analysis
Vol. 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; *;}

Author Affiliations

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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DOI: 10.3964/j.issn.1000-0593(2022)11-3575-06 Cite this Article

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 Copy Citation Text

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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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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 1. Selected vegetation indices in this study

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

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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