Segmentation and Stratification Methods of Field Maize Terrestrial LiDAR Point Cloud

Chengda Lin (), Fangzheng Hu, Junwen Peng, Jing Wang and Ruifang Zhai
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Chengda Lin: College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Fangzheng Hu: College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Junwen Peng: College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Jing Wang: College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Ruifang Zhai: College of Informatics, Huazhong Agricultural University, Wuhan 430070, China

Agriculture, 2022, vol. 12, issue 9, 1-18

Abstract: Three-dimensional (3D) laser point cloud technology is an important research method in the field of agricultural remote sensing research. The collection and processing technology of terrestrial light detection and ranging (LiDAR) point cloud of crops has greatly promoted the integration of agricultural informatization and intelligence. In a smart farmland based on 3D modern agriculture, the manager can efficiently and conveniently achieve the growth status of crops through the point cloud collection system and processing model integrated in the smart agricultural system. To this end, we took field maize as the research object in this study and processed four sets of field maize point clouds, named Maize-01 , Maize-02 , Maize-03 , and Maize-04 , respectively. In this research, we established a field individual maize segmentation model with the density-based clustering algorithm (DBSCAN) as the core, and four groups of field maize were used as research objects. Among them, the value of the overall accuracy (OA) index, which was used to evaluate the comprehensive performance of the model, were 0.98, 0.97, 0.95, and 0.94. Secondly, the multi-condition identification method was used to separate different maize organ point clouds from the individual maize point cloud. In addition, the organ stratification model of field maize was established. In this organ stratification study, we take Maize-04 as the research object and obtained the recognition accuracy rates of four maize organs: tassel, stalk, ear, and leaf at 96.55%, 100%, 100%, and 99.12%, respectively. We also finely segmented the leaf organ obtained from the above-mentioned maize organ stratification model into each leaf individual again. We verified the accuracy of the leaf segmentation method with the leaf length as the representative. In the linear analysis of predicted values of leaf length, R 2 was 0.73, R M S E was 0.12 m, and M A E was 0.07 m. In this study, we examined the segmentation of individual crop fields and established 3D information interpretations for crops in the field as well as for crop organs. Results visualized the real scene of the field, which is conducive to analyzing the response mechanism of crop growth and development to various complex environmental factors.

Keywords: terrestrial laser scanning; field crops; individual maize segmentation; maize organ stratification (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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