Estimation of Leaf Nitrogen Content in Maize based on UAV Hyperspectral Image

生育期	试验区	样本数	最小值/%	最大值/%	平均值/%	标准差/%	变异系数/%
拔节期	试验1	15	2.45	4.38	3.42	0.58	0.16
	试验2	15	2.42	4.40	3.33	0.58	0.17
	试验3	15	2.88	6.04	4.76	0.84	0.18
	试验4	20	4.21	6.55	5.35	0.54	0.10
吐丝期	试验1	15	0.98	2.08	1.60	0.33	0.21
	试验2	15	1.19	2.25	1.81	0.33	0.18
	试验3	15	1.56	2.81	2.20	0.38	0.17
	试验4	20	2.26	3.12	2.70	0.24	0.09
成熟期	试验1	15	0.35	0.62	0.52	0.10	0.19
	试验2	15	0.35	0.90	0.69	0.18	0.26
	试验3	15	0.65	1.35	0.99	0.19	0.19
	试验4	20	0.56	0.92	0.73	0.09	0.12

Table 2. Table 2The spectral indices used in this study

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Table 2. Table 2The spectral indices used in this study

光谱变量	公式	参考文献
CCI（Canopy Chlorophyll Index）	$R_{718} / R_{698}$	Sims等(2005)
Carter4	$R_{710} / R_{758}$	Carter等(1994)
SIPI（Simple Ratio Pigment Index）	$(R_{800} - R_{455)} / (R_{800} + R_{680})$	Penuelas等(1995)
EVI（Enhanced Vegetation Index）	$2.5 \times [(R_{798} - R_{670}) / (R_{798} - (6 \times R_{670}) - (7.5 \times R_{474}) + 1]$	Huete等(2006)
VARI（Vegetation Atmospherically Resistant Index）	$(R_{530} - R_{674}) / (R_{530} + R_{674} - R_{450})$	Gitelson等(2003)
REIP-LI（Red Edge Inflection Point: Linear Interpolation Method）	$700 + 40 \times [(R_{670} + R_{778}) / 2 - R_{698}] / (R_{738} - R_{698})$	Guyot等(1988)
DDi（Desertification Difference Index）	$(R_{750} - R_{718}) - (R_{702} - R_{670})$	Maire等(2004)
NDVI（Normalized Difference Vegetation Index）	$(R_{850} - R_{674}) / (R_{850} + R_{674})$	Rouse et al. (1973)
NIR/NIR（Near infrared/Near Infrared）	$R_{778} / R_{738}$	Mistele等(2004)
CI_re（Red-edge Chlorophyll Index）	$R_{850} / R_{730} - 1$	Gitelson等(2006)
GNDVI（Green Normalized Difference Vegetation Index）	$(R_{790} - R_{550}) / (R_{790} + R_{550})$	Lemaire等(2007)
Maccioni*	$(R_{778} - R_{710}) / (R_{780} - R_{678})$	Datt等(1999)
NDI（Normalized Difference Index）	$(R_{850} - R_{710}) / (R_{850} + R_{678})$	Datt等(1999)
GNDSI（Green Normalized Difference Vegetation Index）	$(R_{798} - R_{550}) / (R_{800} + R_{550})$	Gitelson等(1996)
CI_green（Green Chlorophyll Index）	$R_{850} / R_{530} - 1$	Gitelson A等(2003)
NDRE（Normalized Difference Red Edge Index）	$(R_{790} - R_{718}) / (R_{790} + R_{718})$	Fitzgerald G等(2010)
RVI（Ratio Vegetation Index）	$R_{798} / R_{670}$	Priebe等(1999)
MSR（Modified Simple Ratio）	$\sqrt[]{(R_{800} - R_{670} - 1) / (R_{800} + R_{670} + 1)}$	Chen等(1996)
OSAVI（Optimization of Soil-Adjusted Vegetation Index）	$1.16 \times (R_{800} - R_{670}) / (R_{800} + R_{670} + 0.16)$	Geneviève等(1996)
MTCI（MERIS Terrestrial Chlorophyll Index）	$(R_{754} - R_{709}) / (R_{709} + R_{681})$	Dash等(2004)
TVI（Triangular Vegetation Index）	$0.5 \times [120 \times (R_{750} - R_{550}) - 200 \times (R_{670} - R_{550})]$	Broge等(2001)
VOG²（Vogelmann²）	$(R_{737} - R_{747}) / (R_{715} + R_{726})$	Vogelmann等(1993)

Table 3. Table 3The estimation model of maize LNC and the selection of spectral indices at different growth stages

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Table 3. Table 3The estimation model of maize LNC and the selection of spectral indices at different growth stages

处理

生育期

玉米LNC估算模型

光谱指数的筛选

试验1、

2、3、4

拔节期

\begin{array}{l} L N C = 3.548 - 2.888 \times V A R I + \\ 5.235 \times D D I - 2.787 \times E V I \end{array}

VARI

DDI

EVI

试验1、

2、3、4

吐丝期

\begin{array}{l} L N C = 2.06395 + 2.045 \times M T C I \\ - 1.329 \times S I P I \end{array}

MTCI

SIPI

试验1、

2、3、4

成熟期

\begin{array}{l} L N C = 0.468 + 0.416 \times E V I + \\ 0.984 \times C C I - 0.59 \times N D V I \end{array}

EVI

CCI

NDVI

Tools

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Xingyu ZHANG, Yue ZHANG, Chenzhen XIA, Xiaoyan ZHANG, Yuxi LI, Xiaoyu LI. Estimation of Leaf Nitrogen Content in Maize based on UAV Hyperspectral Image[J]. Remote Sensing Technology and Application, 2024, 39(4): 927

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Paper Information

Category:

Received: Jul. 19, 2021

Accepted: --

Published Online: Jan. 6, 2025

The Author Email:

DOI:10.11873/j.issn.1004-0323.2024.4.0927

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology