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Spray drift evaluation with point clouds data of 3D LiDAR as a potential alternative to the sampling method

文献类型： 外文期刊

作者： Li, Longlong 1 ; Zhang, Ruirui 1 ; Chen, Liping 1 ; Liu, Boqin 4 ; Zhang, Linhuan 1 ; Tang, Qing 1 ; Ding, Chenchen 1 ; Zhang, Zhen 5 ; Hewitt, Andrew J. 6 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Res Ctr Intelligent Equipment, Beijing, Peoples R China

2.Natl Res Ctr Intelligent Equipment Agr, Beijing, Peoples R China

3.Natl Ctr Int Res Agr Aerial Applicat Technol, Beijing, Peoples R China

4.Northwest A&F Univ, Coll Mech & Elect Engn, Yangling, Peoples R China

5.Shandong Agr Univ, Coll Informat Sci & Engn, Tai An, Peoples R China

6.Univ Queensland, Ctr Pesticide Applicat & Safety, Brisbane, QLD, Australia

关键词： plant protection; droplet; spray drift; point clouds; 3D LiDAR; remote sensing

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：6.627； 五年影响因子：7.255 ）

ISSN： 1664-462X

年卷期： 2022 年 13 卷

页码：

收录情况： SCI

摘要： Spray drift is an inescapable consequence of agricultural plant protection operation, which has always been one of the major concerns in the spray application industry. Spray drift evaluation is essential to provide a basis for the rational selection of spray technique and working surroundings. Nowadays, conventional sampling methods with passive collectors used in drift evaluation are complex, time-consuming, and labor-intensive. The aim of this paper is to present a method to evaluate spray drift based on 3D LiDAR sensor and to test the feasibility of alternatives to passive collectors. Firstly, a drift measurement algorithm was established based on point clouds data of 3D LiDAR. Wind tunnel tests included three types of agricultural nozzles, three pressure settings, and five wind speed settings were conducted. LiDAR sensor and passive collectors (polyethylene lines) were placed downwind from the nozzle to measure drift droplets in a vertical plane. Drift deposition volume on each line and the number of LiDAR droplet points in the corresponding height of the collecting line were calculated, and the influencing factors of this new method were analyzed. The results show that 3D LiDAR measurements provide a rich spatial information, such as the height and width of the drift droplet distribution, etc. High coefficients of determination (R-2 > 0.75) were observed for drift points measured by 3D LiDAR compared to the deposition volume captured by passive collectors, and the anti-drift IDK12002 nozzle at 0.2 MPa spray pressure has the largest R-2 value, which is 0.9583. Drift assessment with 3D LiDAR is sensitive to droplet density or drift mass in space and nozzle initial droplet spectrum; in general, larger droplet density or drift mass and smaller droplet size are not conducive to LiDAR detection, while the appropriate threshold range still needs further study. This study demonstrates that 3D LiDAR has the potential to be used as an alternative tool for rapid assessment of spray drift.

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