{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,19]],"date-time":"2026-01-19T05:40:37Z","timestamp":1768801237278,"version":"3.49.0"},"reference-count":22,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2020,2,3]],"date-time":"2020-02-03T00:00:00Z","timestamp":1580688000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100005047","name":"Natural Science Foundation of Liaoning Province","doi-asserted-by":"publisher","award":["2015020769"],"award-info":[{"award-number":["2015020769"]}],"id":[{"id":"10.13039\/501100005047","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>To protect crops from diseases and increase yields, chemical agents are applied by boom sprayers. To achieve the optimal effect, the boom and the crop canopy should be kept at an appropriate distance. So, it is crucial to be able to distinguish the crop canopy from other plant leaves. Based on ultrasonic ranging, this paper adopts the fuzzy iterative self-organizing data analysis technique algorithm to identify the canopy location. According to the structural characteristics of the crop canopy, based on fuzzy clustering, the algorithm can dynamically adjust the number and center of clusters so as to get the optimal results. Therefore, the distances from the sensor to the canopy or the ground can be accurately acquired, and the influence of lower leaves on the measurement results can be alleviated. Potted corn plants from the 3-leaf stage to the 6-leaf stage were tested on an experiment bench. The results showed that the calculated distances from the sensor to the canopy using this method had good correlation with the manually measured distances. The maximum error of calculated values appeared at the 3-leaf stage. With the growth of plants, the error of calculated values decreased. The increased sensor moving speeds led to increased error due to the reduced data points. From the 3-leaf stage to the 5-leaf stage, the distances from the sensor to the ground can also be obtained at the same time. The method proposed in this paper provides a practical resolution to localize the canopy for adjusting the height of sprayer boom.<\/jats:p>","DOI":"10.3390\/s20030818","type":"journal-article","created":{"date-parts":[[2020,2,5]],"date-time":"2020-02-05T03:18:48Z","timestamp":1580872728000},"page":"818","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["A Crop Canopy Localization Method Based on Ultrasonic Ranging and Iterative Self-Organizing Data Analysis Technique Algorithm"],"prefix":"10.3390","volume":"20","author":[{"given":"Fang","family":"Li","sequence":"first","affiliation":[{"name":"College of Engineering, Shenyang Agricultural University, Shenyang 110866, China"},{"name":"School of Mining Engineering, Liaoning Shihua University, Fushun 113001, China"}]},{"given":"Xiaohu","family":"Bai","sequence":"additional","affiliation":[{"name":"College of Engineering, Shenyang Agricultural University, Shenyang 110866, China"}]},{"given":"Yongkui","family":"Li","sequence":"additional","affiliation":[{"name":"College of Engineering, Shenyang Agricultural University, Shenyang 110866, China"}]}],"member":"1968","published-online":{"date-parts":[[2020,2,3]]},"reference":[{"key":"ref_1","first-page":"113","article-title":"Experimental study on spray deposition uniformity","volume":"15","author":"Qi","year":"1999","journal-title":"Trans. Csae"},{"key":"ref_2","first-page":"465","article-title":"Spray distribution uniformity of boom spraying","volume":"29","author":"Chen","year":"2008","journal-title":"J. Jiangsu Univ."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"647","DOI":"10.13031\/2013.16094","article-title":"Sprayer boom dynamic effects on application uniformity","volume":"47","author":"Jeon","year":"2004","journal-title":"Trans. ASAE"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"115","DOI":"10.1016\/j.biosystemseng.2018.06.003","article-title":"A novel method for testing automatic systems for controlling the spray boom height","volume":"174","author":"Andreas","year":"2018","journal-title":"Biosyst. Eng."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1006\/jaer.1996.0115","article-title":"Spray boom motions and spray distribution: Part 2, Experimental validation of the mathematical relation and simulation results","volume":"66","author":"Ramon","year":"1997","journal-title":"J. Agri. Eng. Res."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/j.biosystemseng.2016.10.015","article-title":"Field-crop-sprayer potential drift measured using test bench: Effects of boom height and nozzle type","volume":"154","author":"Paolo","year":"2017","journal-title":"Biosyst. Eng."},{"key":"ref_7","first-page":"61","article-title":"Analysis and test of dynamic characteristic of large spray in boom and pendulum suspension damping system","volume":"33","author":"Cui","year":"2017","journal-title":"Trans. CSAE"},{"key":"ref_8","first-page":"59","article-title":"Research progress analysis of variable rate sprayer technology","volume":"46","author":"Qiu","year":"2015","journal-title":"Trans. CSAM"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"17343","DOI":"10.3390\/s121217343","article-title":"An Ultrasonic System for Weed Detection in Cereal Crops","volume":"12","author":"Dionisio","year":"2012","journal-title":"Sensors"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1016\/j.compag.2011.09.005","article-title":"Assessment of forage mass from grassland swards by height measurement using an ultrasonic sensor","volume":"79","author":"Thomas","year":"2011","journal-title":"Comput. Electron. Agric."},{"key":"ref_11","unstructured":"Shrestha, D.S., Steward, B.L., and Birrell, S.J. (2002, January 28\u201331). Corn plant height estimation using two sensing systems. Proceedings of the 2002 ASAE Annual International Meeting\/ CIGR XVth World Congress, Chicago, IL, USA."},{"key":"ref_12","unstructured":"Kataoka, T., Okamoto, H., Kaneko, T., and Hata, S. (2002, January 28\u201331). Performance of corn height sensing using ultrasonic sensor and laser beam sensor. Proceedings of the 2002 ASAE Annual International Meeting\/ CIGR XVth World Congress, Chicago, IL, USA."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1016\/j.biosystemseng.2017.02.004","article-title":"A real-time ultrasonic system to measure wild blueberry plant height during harvesting","volume":"157","author":"Chang","year":"2017","journal-title":"Biosyst. Eng."},{"key":"ref_14","first-page":"37","article-title":"Design and test of smart-targeting spraying system on boom sprayer","volume":"47","author":"Liu","year":"2016","journal-title":"Trans. CSAM"},{"key":"ref_15","first-page":"66","article-title":"Online control system of spray boom height and balance","volume":"46","author":"Wei","year":"2015","journal-title":"Trans. CSAM"},{"key":"ref_16","first-page":"161","article-title":"Design and experiments on boom height adjusting system","volume":"36","author":"Wang","year":"2014","journal-title":"J. Agri. Mech. Res."},{"key":"ref_17","first-page":"82","article-title":"Agricultural land gradation based on the fuzzy ISODATA clustering method","volume":"24","author":"Jin","year":"2008","journal-title":"Trans. CSAE"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"3336","DOI":"10.1016\/j.eswa.2008.01.039","article-title":"A simple and fast algorithm for K-means clustering","volume":"36","author":"Park","year":"2009","journal-title":"Expert Syst. Appl."},{"key":"ref_19","first-page":"155","article-title":"Evaluation indicators of cultivated layer soil quality for red soil slope farmland based on cluster and PCA analysis","volume":"34","author":"Jin","year":"2018","journal-title":"Trans. CSAE"},{"key":"ref_20","first-page":"257","article-title":"Agricultural land classification based on fuzzy comprehensive analysis","volume":"30","author":"Pan","year":"2014","journal-title":"Trans. CSAE"},{"key":"ref_21","first-page":"310","article-title":"Application of clustering analysis to land use zoning of coastal region in Jiangsu Province","volume":"26","author":"Zhao","year":"2010","journal-title":"Trans. CSAE"},{"key":"ref_22","first-page":"387","article-title":"A physical interpretation of fuzzy ISODATA","volume":"6","author":"Bezdek","year":"1976","journal-title":"IEEE Trans. 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