Inversion of Soybean Leaf Area Index Based on UAV Multispectral Remote Sensing

doi:10.11924/j.issn.1000-6850.casb2020-0229

Abstract

Abstract:

In order to provide basic data for the scientific management of soybean, the inversion and estimation of LAI was realized by using the multispectral remote sensing data of UAV. Five indices with good correlation with LAI were selected from various spectral vegetation indices, and the remote sensing inversion model of soybean leaf area index in northeast China was analyzed and discussed. The results show that except NDVI, the other four vegetation index models have better precision, and the determination coefficient R² is more than 0.6; support vector machine model, the determination coefficient R² is 0.688, and the root mean square error is 0.016, which has better prediction ability. Both models show that the UAV multispectral remote sensing system can quickly retrieve the soybean leaf area index in the field, which has practical significance in guiding precision agricultural production.

Key words: UAV, vegetation index, regression analysis, support vector machine, soybean, leaf area index

CLC Number:

Wang Jun, Jiang Yun. Inversion of Soybean Leaf Area Index Based on UAV Multispectral Remote Sensing[J]. Chinese Agricultural Science Bulletin, 2021, 37(19): 134-142.

Figures/Tables 14

References 32

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参数	参数值
起飞载重	4.6 kg
飞行载荷	850 g
飞行时间	约25 min
航行速度	2.5 m/s

参数	参数值
起飞载重	4.6 kg
飞行载荷	850 g
飞行时间	约25 min
航行速度	2.5 m/s

参数	数值
质量	180 g
尺寸	12.1 cm×6.6 cm×4.6 cm
外部电源	5.0 V DC,4 W（8 W峰值）
光谱波段	蓝色,绿色,红色,红色边缘,近红外（全球快门,窄带）
RGB颜色输出	3.6 MP(全局快门,与所有波段对齐
地面采样距离(GSD)	每像素8 cm（每带）120 m AGL
捕获速率	每秒捕获1次（所有波段）,12位RAW
接口	串行、以太网、WiFi、外部触发器、GPS
视野	47.2°HFOV

参数	数值
质量	180 g
尺寸	12.1 cm×6.6 cm×4.6 cm
外部电源	5.0 V DC,4 W（8 W峰值）
光谱波段	蓝色,绿色,红色,红色边缘,近红外（全球快门,窄带）
RGB颜色输出	3.6 MP(全局快门,与所有波段对齐
地面采样距离(GSD)	每像素8 cm（每带）120 m AGL
捕获速率	每秒捕获1次（所有波段）,12位RAW
接口	串行、以太网、WiFi、外部触发器、GPS
视野	47.2°HFOV

参数	参数值
型号	LI-COR LAI-2200C
测量范围	0~2700 μmol/(m²·s)
尺寸	63.8 cm (L)×2.9 cm (W)×2.9 cm (D)
水平位置准确度	2.5 m CEP
质量	0.845 kg
植物叶面积指数测量仪	用于320~490 nm波段内的光合有效辐射测量