scholarly journals Estimation of Nitrogen Nutrition Status in Winter Wheat From Unmanned Aerial Vehicle Based Multi-Angular Multispectral Imagery

2019 ◽  
Vol 10 ◽  
Author(s):  
Ning Lu ◽  
Wenhui Wang ◽  
Qiaofeng Zhang ◽  
Dong Li ◽  
Xia Yao ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Unmanned Aerial Vehicle ◽  
Nitrogen Nutrition ◽  
Nutrition Status ◽  
Multispectral Imagery ◽  
Aerial Vehicle

scholarly journals A Comparative Assessment of Different Modeling Algorithms for Estimating Leaf Nitrogen Content in Winter Wheat Using Multispectral Images from an Unmanned Aerial Vehicle

2018 ◽  
Vol 10 (12) ◽  
pp. 2026 ◽  
Author(s):  
Hengbiao Zheng ◽  
Wei Li ◽  
Jiale Jiang ◽  
Yong Liu ◽  
Tao Cheng ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Unmanned Aerial Vehicle ◽  
Processing Speed ◽  
Parametric Modeling ◽  
Comparative Assessment ◽  
Transfer Model ◽  
Leaf Nitrogen Content ◽  
Multispectral Imagery ◽  
Aerial Vehicle ◽  
Non Parametric

Unmanned aerial vehicle (UAV)-based remote sensing (RS) possesses the significant advantage of being able to efficiently collect images for precision agricultural applications. Although numerous methods have been proposed to monitor crop nitrogen (N) status in recent decades, just how to utilize an appropriate modeling algorithm to estimate crop leaf N content (LNC) remains poorly understood, especially based on UAV multispectral imagery. A comparative assessment of different modeling algorithms (i.e., simple and non-parametric modeling algorithms alongside the physical model retrieval method) for winter wheat LNC estimation is presented in this study. Experiments were conducted over two consecutive years and involved different winter wheat varieties, N rates, and planting densities. A five-band multispectral camera (i.e., 490 nm, 550 nm, 671 nm, 700 nm, and 800 nm) was mounted on a UAV to acquire canopy images across five critical growth stages. The results of this study showed that the best-performing vegetation index (VI) was the modified renormalized difference VI (RDVI), which had a determination coefficient (R2) of 0.73 and a root mean square error (RMSE) of 0.38. This method was also characterized by a high processing speed (0.03 s) for model calibration and validation. Among the 13 non-parametric modeling algorithms evaluated here, the random forest (RF) approach performed best, characterized by R2 and RMSE values of 0.79 and 0.33, respectively. This method also had the advantage of full optical spectrum utilization and enabled flexible, non-linear fitting with a fast processing speed (2.3 s). Compared to the other two methods assessed here, the use of a look up table (LUT)-based radiative transfer model (RTM) remained challenging with regard to LNC estimation because of low prediction accuracy (i.e., an R2 value of 0.62 and an RMSE value of 0.46) and slow processing speed. The RF approach is a fast and accurate technique for N estimation based on UAV multispectral imagery.

scholarly journals Use of an Active Canopy Sensor Mounted on an Unmanned Aerial Vehicle to Monitor the Growth and Nitrogen Status of Winter Wheat

2020 ◽  
Vol 12 (22) ◽  
pp. 3684
Author(s):  
Jie Jiang ◽  
Zeyu Zhang ◽  
Qiang Cao ◽  
Yan Liang ◽  
Brian Krienke ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Dry Matter ◽  
Vegetation Index ◽  
Nutrition Status ◽  
Growth Stages ◽  
Growth Indices ◽  
N Accumulation ◽  
N Nutrition ◽  
Red Edge ◽  
Aerial Vehicle

Using remote sensing to rapidly acquire large-area crop growth information (e.g., shoot biomass, nitrogen status) is an urgent demand for modern crop production; unmanned aerial vehicle (UAV) acts as an effective monitoring platform. In order to improve the practicability and efficiency of UAV based monitoring technique, four field experiments involving different nitrogen (N) rates (0–360 kg N ha−1) and seven winter wheat (Triticum aestivum L.) varieties were conducted at different eco-sites (Sihong, Rugao, and Xinghua) during 2015–2019. A multispectral active canopy sensor (RapidSCAN CS-45; Holland Scientific Inc., Lincoln, NE, USA) mounted on a multirotor UAV platform was used to collect the canopy spectral reflectance data of winter wheat at key growth stages, three growth parameters (leaf area index (LAI), leaf dry matter (LDM), plant dry matter (PDM)) and three N indicators (leaf N accumulation (LNA), plant N accumulation (PNA) and N nutrition index (NNI)) were measured synchronously. The quantitative linear relationships between spectral data and six growth indices were systematically analyzed. For monitoring growth and N nutrition status at Feekes stages 6.0–10.0, 10.3–11.1 or entire growth stages, red edge ratio vegetation index (RERVI), red edge chlorophyll index (CIRE) and difference vegetation index (DVI) performed the best among the red edge band-based and red-based vegetation indices, respectively. Across all growth stages, DVI was highly correlated with LAI (R2 = 0.78), LDM (R2 = 0.61), PDM (R2 = 0.63), LNA (R2 = 0.65) and PNA (R2 = 0.73), whereas the relationships between RERVI (R2 = 0.62), CIRE (R2 = 0.62) and NNI had high coefficients of determination. The developed models performed better in monitoring growth indices and N status at Feekes stages 10.3–11.1 than Feekes stages 6.0–10.0. To sum it up, the UAV-mounted active sensor system is able to rapidly monitor the growth and N nutrition status of winter wheat and can be deployed for UAV-based remote-sensing of crops.

Assessing winter wheat foliage disease severity using aerial imagery acquired from small Unmanned Aerial Vehicle (UAV)

2020 ◽  
Vol 176 ◽  
pp. 105665
Author(s):  
Mahendra Bhandari ◽  
Amir M.H. Ibrahim ◽  
Qingwu Xue ◽  
Jinha Jung ◽  
Anjin Chang ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Disease Severity ◽  
Unmanned Aerial Vehicle ◽  
Aerial Imagery ◽  
Aerial Vehicle

scholarly journals Detection of Flavescence dorée Grapevine Disease Using Unmanned Aerial Vehicle (UAV) Multispectral Imagery

2017 ◽  
Vol 9 (4) ◽  
pp. 308 ◽  
Author(s):  
Johanna Albetis ◽  
Sylvie Duthoit ◽  
Fabio Guttler ◽  
Anne Jacquin ◽  
Michel Goulard ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicle ◽  
Multispectral Imagery ◽  
Flavescence Dorée ◽  
Aerial Vehicle ◽  
Grapevine Disease

Unsupervised discrimination between lodged and non-lodged winter wheat: a case study using a low-cost unmanned aerial vehicle

2018 ◽  
Vol 39 (8) ◽  
pp. 2079-2088 ◽  
Author(s):  
Jian-Jun Wang ◽  
Hao Ge ◽  
Qigen Dai ◽  
Irshad Ahmad ◽  
Qixing Dai ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Unmanned Aerial Vehicle ◽  
Low Cost ◽  
Aerial Vehicle
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