NDLI: Estimation of Rice Growth Parameters Based on Linear Mixed-Effect Model Using Multispectral Images from Fixed-Wing Unmanned Aerial Vehicles

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Estimation of Rice Growth Parameters Based on Linear Mixed-Effect Model Using Multispectral Images from Fixed-Wing Unmanned Aerial Vehicles

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Yanyu Wang Ke Zhang Chunlan Tang Qiang Cao Yongchao Tian Yan Zhu Weixing Cao Xiaojun Liu
Abstract	The accurate estimation of aboveground biomass (AGB) and leaf area index (LAI) is critical to characterize crop growth status and predict grain yield. Unmanned aerial vehicle (UAV) -based remote sensing has attracted significant interest due to its high flexibility and easiness of operation. The mixed effect model introduced in this study can capture secondary factors that cannot be captured by standard empirical relationships. The objective of this study was to explore the potential benefit of using a linear mixed-effect (LME) model and multispectral images from a fixed-wing UAV to estimate both AGB and LAI of rice. Field experiments were conducted over two consecutive years (2017−2018), that involved different N rates, planting patterns and rice cultivars. Images were collected by a compact multispectral camera mounted on a fixed-wing UAV during key rice growth stages. LME, simple regression (SR), artificial neural networks (ANN) and random forests (RF) models were developed relating growth parameters (AGB and LAI) to spectral information. Cultivar (C), growth stage (S) and planting pattern (P) were selected as candidates of random effects for the LME models due to their significant effects on rice growth. Compared to other regression models (SR, ANN and RF), the LME model improved the AGB estimation accuracy for all stage groups to varying degrees: the $R^{2}$ increased by 0.14−0.35 and the RMSE decreased by 0.88−1.80 t $ha^{−1}$ for the whole season, the $R^{2}$ increased by 0.07−0.15 and the RMSE decreased by 0.31−0.61 t $ha^{−1}$ for pre-heading stages and the $R^{2}$ increased by 0.21−0.53 and the RMSE decreased by 0.72−1.52 t $ha^{−1}$ for post-heading stages. Further analysis suggested that the LME model also successfully predicted within the groups when the number of groups was suitable. More importantly, depending on the availability of C, S, P or combinations thereof, mixed effects could lead to an outperformance of baseline retrieval methods (SR, ANN or RF) due to the inclusion of secondary effects. Satisfactory results were also obtained for the LAI estimation while the superiority of the LME model was not as significant as that for AGB estimation. This study demonstrates that the LME model could accurately estimate rice AGB and LAI and fixed-wing UAVs are promising for the monitoring of the crop growth status over large-scale farmland.
e-ISSN	20724292
DOI	10.3390/rs11111371
Journal	Remote Sensing
Issue Number	11
Volume Number	11
Language	English
Publisher	MDPI AG
Publisher Date	2019-06-01
Publisher Place	Switzerland
Access Restriction	Open
Subject Keyword	Science Aboveground Biomass Leaf Area Index Vegetation Index Linear Mixed-effect Model Uav Multispectral Image Remote Sensing Rice
Content Type	Text
Resource Type	Article

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