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Rapid monitoring of tea plants under cold stress based on UAV multi-sensor data

文献类型： 外文期刊

作者： Mao, Yilin 1 ; Li, He 1 ; Wang, Yu 1 ; Wang, Huan 1 ; Shen, Jiazhi 2 ; Xu, Yang 1 ; Ding, Shibo 3 ; Wang, Hui 3 ; Ding, Zhaotang 1 ; Fan, Kai 1 ;

作者机构： 1.Qingdao Agr Univ, Coll Hort, Qingdao 266109, Peoples R China

2.Shandong Acad Agr Sci, Tea Res Inst, Jinan 250100, Peoples R China

3.Rizhao Acad Agr Sci, Tea Res Inst, Rizhao 276800, Peoples R China

关键词： Tea plant; Cold stress; UAV; Multi-source remote sensing; Deep learning

期刊名称：COMPUTERS AND ELECTRONICS IN AGRICULTURE （ 影响因子：8.3； 五年影响因子：8.3 ）

ISSN： 0168-1699

年卷期： 2023 年 213 卷

页码：

收录情况： SCI

摘要： In the context of climate change, extreme weather events, represented by frost injury, are increasingly having a negative impact on the growth of tea plants. This has brought huge losses to the tea industry. Traditionally, the freezing injury of tea plants in the field was assessed by vision. This is labor-intensive and subjective. In this research, multimodal remote sensing data from different periods of natural overwintering tea plantations were collected by using unmanned aerial vehicles (UAV) equipped with multispectral (MS), thermal infrared (TIR) and RGB sensors. And the physiological data of tea leaves on the same day were obtained to construct a tea cold injury score (TCIS). Then, a convolutional neural networks-gate recurrent unit (CNN-GRU) model was improved for estimating TCIS. To better compare the performance of CNN-GRU, a single GRU model and three classical machine learning models were also used for comparison. The study found that: (1) The multimodal data fusion was superior to the unimodal data. The best prediction results were achieved for the combined bimodal MS + RGB data (Rp2 = 0.862, RMSEP = 0.138, RPD = 2.220); (2) The CNN-GRU hybrid model was superior to the other four baseline models. The best effect was achieved based on the multivariate input of MS + RGB (Rp2 = 0.862) or MS + RGB + TIR (Rp2 = 0.850); (3) The accuracy of the model after removing soil features was lower than that of the model without background removal. Therefore, the TCIS-CNN-GRU model combined with multi source remote sensing data can objectively and accurately evaluate the cold injury phenotype of tea plants, making the CNN-GRU model more scientific and promising.

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