{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T18:34:05Z","timestamp":1775327645001,"version":"3.50.1"},"reference-count":52,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2016,9,6]],"date-time":"2016-09-06T00:00:00Z","timestamp":1473120000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100010761","name":"Syngenta","doi-asserted-by":"publisher","award":["Chair UPC-Syngenta"],"award-info":[{"award-number":["Chair UPC-Syngenta"]}],"id":[{"id":"10.13039\/501100010761","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003329","name":"Ministerio de Econom\u00eda y Competitividad","doi-asserted-by":"publisher","award":["AGL2013-48297-C2-1-R"],"award-info":[{"award-number":["AGL2013-48297-C2-1-R"]}],"id":[{"id":"10.13039\/501100003329","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Canopy characterization is essential for pesticide dosage adjustment according to vegetation volume and density. It is especially important for fresh exportable vegetables like greenhouse tomatoes. These plants are thin and tall and are planted in pairs, which makes their characterization with electronic methods difficult. Therefore, the accuracy of the terrestrial 2D LiDAR sensor is evaluated for determining canopy parameters related to volume and density and established useful correlations between manual and electronic parameters for leaf area estimation. Experiments were performed in three commercial tomato greenhouses with a paired plantation system. In the electronic characterization, a LiDAR sensor scanned the plant pairs from both sides. The canopy height, canopy width, canopy volume, and leaf area were obtained. From these, other important parameters were calculated, like the tree row volume, leaf wall area, leaf area index, and leaf area density. Manual measurements were found to overestimate the parameters compared with the LiDAR sensor. The canopy volume estimated with the scanner was found to be reliable for estimating the canopy height, volume, and density. Moreover, the LiDAR scanner could assess the high variability in canopy density along rows and hence is an important tool for generating canopy maps.<\/jats:p>","DOI":"10.3390\/s16091435","type":"journal-article","created":{"date-parts":[[2016,9,6]],"date-time":"2016-09-06T10:10:16Z","timestamp":1473156616000},"page":"1435","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["Testing the Suitability of a Terrestrial 2D LiDAR Scanner for Canopy Characterization of Greenhouse Tomato Crops"],"prefix":"10.3390","volume":"16","author":[{"given":"Jordi","family":"Llop","sequence":"first","affiliation":[{"name":"Department of Agrifood Engineering and Biotechnology, Polytechnic University of Catalonia, Esteve Terradas, 8, Castelldefels 08860, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3929-5649","authenticated-orcid":false,"given":"Emilio","family":"Gil","sequence":"additional","affiliation":[{"name":"Department of Agrifood Engineering and Biotechnology, Polytechnic University of Catalonia, Esteve Terradas, 8, Castelldefels 08860, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4625-1860","authenticated-orcid":false,"given":"Jordi","family":"Llorens","sequence":"additional","affiliation":[{"name":"Department of Rural Engineering, Area of Rural Mechanization and Technology, University of Cordoba, C\u00f3rdoba 14005, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7850-0126","authenticated-orcid":false,"given":"Antonio","family":"Miranda-Fuentes","sequence":"additional","affiliation":[{"name":"Department of Rural Engineering, Area of Rural Mechanization and Technology, University of Cordoba, C\u00f3rdoba 14005, Spain"}]},{"given":"Montserrat","family":"Gallart","sequence":"additional","affiliation":[{"name":"Department of Agrifood Engineering and Biotechnology, Polytechnic University of Catalonia, Esteve Terradas, 8, Castelldefels 08860, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2016,9,6]]},"reference":[{"key":"ref_1","unstructured":"European Parliament (2009). European Directive 2009\/128\/EC for the Sustainable Use of Pesticides, European Parliament."},{"key":"ref_2","unstructured":"MAGRAMA (2013). Encuesta Sobre Superficies y Rendimientos de Cultivos."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"184","DOI":"10.1016\/j.scitotenv.2014.09.026","article-title":"Health risk for children and adults consuming apples with pesticide residue","volume":"502","author":"Lozowicka","year":"2015","journal-title":"Sci. Total Environ."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"390","DOI":"10.1590\/S0103-90162013000600003","article-title":"Volume application rate adapted to the canopy size in greenhouse tomato crops","volume":"70","year":"2013","journal-title":"Sci. Agricola"},{"key":"ref_5","unstructured":"Medina, R., Sanchez-Hermosilla, J., and G\u00e1zquez, J.C. (2005, January 12\u201316). Deposition Analysis of Several Application Volumes of Pesticides Adapted to the Growth of a Greenhouse Tomato Crop. Proceedings of the International Conference on Sustainable Greenhouse Systems (Greensys2004), Leuven, Belgium."},{"key":"ref_6","first-page":"1","article-title":"Pesticide dose adjustment in vineyard spraying and potential for dose reduction","volume":"10","author":"Pergher","year":"2008","journal-title":"Agric. Eng. Int.: CIGR J."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"93","DOI":"10.21273\/HORTSCI.19.1.93","article-title":"Effect of apple tree size and canopy density on spray chemical deposit","volume":"19","author":"Byers","year":"1984","journal-title":"Hortscience"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"480","DOI":"10.1094\/PD-69-480","article-title":"Evaluation of the Tree-Row-Volume concept with density adjustments in relation to spray deposits in apple orchards","volume":"68","author":"Sutton","year":"1984","journal-title":"Plant Dis."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"136","DOI":"10.1016\/j.compag.2013.02.010","article-title":"Variable rate sprayer. Part 2\u2014Vineyard prototype: Design, implementation, and validation","volume":"95","author":"Gil","year":"2013","journal-title":"Comput. Electron. Agric."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/j.cropro.2009.12.022","article-title":"Variable rate dosing in precision viticulture: Use of electronic devices to improve application efficiency","volume":"29","author":"Llorens","year":"2010","journal-title":"Crop Prot."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"296","DOI":"10.1016\/j.scitotenv.2016.06.013","article-title":"Assessing the optimal liquid volume to be sprayed on isolated olive trees according to their canopy volume","volume":"568","author":"Llorens","year":"2016","journal-title":"Sci. Total Environ."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"342","DOI":"10.1177\/003072708101000707","article-title":"Minimizing pesticide waste in orchard spraying","volume":"10","author":"Morgan","year":"1981","journal-title":"Outlook Agric."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"EPPO (2012). Dose expression for plant protection products. EPPO Bull., 42, 409\u2013415.","DOI":"10.1111\/epp.12000"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"132","DOI":"10.1016\/j.cropro.2011.08.018","article-title":"An examination of Leaf-Wall-Area dose expression","volume":"35","author":"Walklate","year":"2012","journal-title":"Crop Prot."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/j.eja.2011.03.005","article-title":"Field validation of DOSAVI\u00d1A, a decision support system to determine the optimal volume rate for pesticide application in vineyards","volume":"35","author":"Gil","year":"2011","journal-title":"Eur. J. Agron."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"145","DOI":"10.13031\/2013.26323","article-title":"Design of a decision support method to determine volume rate for vineyard spraying","volume":"25","author":"Gil","year":"2009","journal-title":"Appl. Eng. Agric."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1016\/j.compag.2010.12.015","article-title":"Support system for efficient dosage of orchard and vineyard spraying products","volume":"75","author":"Walklate","year":"2011","journal-title":"Comput. Electron. Agric."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1111\/j.1744-7348.2003.tb00264.x","article-title":"A generic method of pesticide dose expression: Application to broadcast spraying of apple trees","volume":"143","author":"Walklate","year":"2003","journal-title":"Ann. Appl. Biol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2902","DOI":"10.3390\/s150202902","article-title":"Testing accuracy of long-range ultrasonic sensors for olive tree canopy measurements","volume":"15","author":"Llorens","year":"2015","journal-title":"Sensors"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2177","DOI":"10.3390\/s110202177","article-title":"Ultrasonic and LIDAR sensors for electronic canopy characterization in vineyards: Advances to improve pesticide application methods","volume":"11","author":"Llorens","year":"2011","journal-title":"Sensors"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2459","DOI":"10.3390\/s110302459","article-title":"Performance of an ultrasonic ranging sensor in apple tree canopies","volume":"11","author":"Planas","year":"2011","journal-title":"Sensors"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1016\/j.compag.2005.02.015","article-title":"Geometric plant properties by relaxed stereo vision using simulated annealing","volume":"49","author":"Andersen","year":"2005","journal-title":"Comput. Electron. Agric."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1158","DOI":"10.1111\/j.1365-3040.2005.01353.x","article-title":"Foliage randomness and light interception in 3-D digitized trees: An analysis from multiscale discretization of the canopy","volume":"28","author":"Sinoquet","year":"2005","journal-title":"Plant Cell Environ."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"5769","DOI":"10.3390\/s110605769","article-title":"Innovative LIDAR 3D dynamic measurement system to estimate fruit-tree leaf area","volume":"11","author":"Camp","year":"2011","journal-title":"Sensors"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"516","DOI":"10.3390\/s130100516","article-title":"Use of a terrestrial LIDAR sensor for drift detection in vineyard spraying","volume":"13","author":"Gil","year":"2013","journal-title":"Sensors"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1016\/j.biosystemseng.2013.02.003","article-title":"LiDAR simulation in modelled orchards to optimise the use of terrestrial laser scanners and derived vegetative measures","volume":"115","author":"Sanz","year":"2013","journal-title":"Biosyst. Eng."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3625","DOI":"10.1016\/j.rse.2011.08.023","article-title":"Evaluation of the MODIS LAI product using independent lidar-derived LAI: A case study in mixed conifer forest","volume":"115","author":"Jensen","year":"2011","journal-title":"Remote Sens. Environ."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1016\/j.biosystemseng.2008.10.009","article-title":"A tractor-mounted scanning LIDAR for the non-destructive measurement of vegetative volume and surface area of tree-row plantations: A comparison with conventional destructive measurements","volume":"102","author":"Sanz","year":"2009","journal-title":"Biosyst. Eng."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.rse.2013.03.020","article-title":"Three-dimensional forest reconstruction and structural parameter retrievals using a terrestrial full-waveform lidar instrument (Echidna\u00ae)","volume":"135","author":"Yang","year":"2013","journal-title":"Remote Sens. Environ."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1016\/j.compag.2011.09.007","article-title":"A review of methods and applications of the geometric characterization of tree crops in agricultural activities","volume":"81","author":"Rosell","year":"2012","journal-title":"Comput. Electron. Agric."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"691","DOI":"10.3390\/s140100691","article-title":"Advanced technologies for the improvement of spray application techniques in spanish viticulture: An overview","volume":"14","author":"Gil","year":"2014","journal-title":"Sensors"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"250","DOI":"10.1016\/j.compag.2007.08.007","article-title":"Comparison of two 2D laser scanners for sensing object distances, shapes, and surface patterns","volume":"60","author":"Lee","year":"2008","journal-title":"Comput. Electron. Agric."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1287","DOI":"10.1016\/j.cropro.2006.11.003","article-title":"Variable rate application of plant protection products in vineyard using ultrasonic sensors","volume":"26","author":"Gil","year":"2007","journal-title":"Crop Prot."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1016\/j.cropro.2015.09.026","article-title":"Influence of air-assistance on spray application for tomato plants in greenhouses","volume":"78","author":"Llop","year":"2015","journal-title":"Crop Prot."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/j.cropro.2006.04.002","article-title":"Dosage of plant protection products adapted to leaf area index in viticulture","volume":"26","author":"Siegfried","year":"2007","journal-title":"Crop Prot."},{"key":"ref_36","first-page":"353","article-title":"Expression of dose rate with respect to orchard sprayer function","volume":"66","author":"Weisser","year":"2002","journal-title":"Asp. Appl. Biol."},{"key":"ref_37","first-page":"25","article-title":"Spray adjustments based on LWA concept in vineyard. Relationship between canopy and coverage for different application settings","volume":"122","author":"Gil","year":"2014","journal-title":"Asp. Appl. Biol."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1016\/S0261-2194(96)00054-3","article-title":"Foliar deposition and pesticide losses from three air-assisted sprayers in a hedgerow vineyard","volume":"16","author":"Pergher","year":"1997","journal-title":"Crop Prot."},{"key":"ref_39","first-page":"285","article-title":"Relationship between orchard tree crop structure and performance characteristics of an axial fan sprayer","volume":"57","author":"Walklate","year":"2000","journal-title":"Asp. Appl. Biol."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"3671","DOI":"10.3390\/s150203671","article-title":"Towards an optimized method of olive tree crown volume measurement","volume":"15","author":"Llorens","year":"2015","journal-title":"Sensors"},{"key":"ref_41","first-page":"197","article-title":"An autonomous self-propelled sprayer for safer pesticide application in glasshouse","volume":"114","author":"Balsari","year":"2012","journal-title":"Asp. Appl. Biol."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"242","DOI":"10.1016\/j.compag.2013.08.015","article-title":"Comparison of conventional measurement and LiDAR-based measurement for crown structures","volume":"98","author":"Xu","year":"2013","journal-title":"Comput. Electron. Agric."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"176","DOI":"10.1016\/j.compag.2012.09.017","article-title":"Different methodologies for calculating crown volumes of Platanus hispanica trees using terrestrial laser scanner and a comparison with classical dendrometric measurements","volume":"90","author":"Sajdak","year":"2013","journal-title":"Comput. Electron. Agric."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"591","DOI":"10.1093\/biomet\/52.3-4.591","article-title":"An analysis of variance test for normality (Complete samples)","volume":"52","author":"Shapiro","year":"1965","journal-title":"Biometrika"},{"key":"ref_45","first-page":"21","article-title":"Power comparisons of Shapiro-Wilk, Kolmogorov-Smirnov, Lilliefors and Anderson-Darling tests","volume":"2","author":"Razali","year":"2011","journal-title":"J. Stat. Model. Anal."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"1505","DOI":"10.1016\/j.agrformet.2009.04.008","article-title":"Obtaining the three-dimensional structure of tree orchards from remote 2D terrestrial LIDAR scanning","volume":"149","author":"Rosell","year":"2009","journal-title":"Agric. For. Meteorol."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"367","DOI":"10.13031\/2013.8587","article-title":"Investigation of laser and ultrasonic ranging sensors for measurements of citrus canopy volume","volume":"18","author":"Tumbo","year":"2002","journal-title":"Appl. Eng. Agric."},{"key":"ref_48","unstructured":"Escol\u00e0, A., Camp, F., Solanelles, F., Planas, S., Gracia, F., Rosell, J.R., Gil, E., and Val, L. (2006, January 9\u201312). Spray application volume test in apple and pear orchards in Catalonia (Spain) and Variable Rate Technology for dose adjustment. Proceedings of the 2006 ASABE Annual International Meeting, Portland, OR, USA."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"122","DOI":"10.1016\/j.compag.2013.02.004","article-title":"Variable rate sprayer. Part 1\u2014Orchard prototype: Design, implementation and validation","volume":"95","author":"Planas","year":"2013","journal-title":"Comput. Electron. Agric."},{"key":"ref_50","first-page":"1","article-title":"A system for adjusting the spray application to the target characteristics","volume":"X","author":"Balsari","year":"2008","journal-title":"Agric. Eng. Int. CIGR J."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"153","DOI":"10.1016\/j.agrformet.2012.11.013","article-title":"Relationship between tree row LIDAR-volume and leaf area density for fruit orchards and vineyards obtained with a LIDAR 3D dynamic measurement system","volume":"171\u2013172","author":"Sanz","year":"2013","journal-title":"Agric. For. Meteorol."},{"key":"ref_52","first-page":"1263","article-title":"Spray Deposition inside tree canopies from a newly developed variable-rate air-assisted sprayer","volume":"56","author":"Chen","year":"2013","journal-title":"Trans. ASABE"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/16\/9\/1435\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T19:30:10Z","timestamp":1760211010000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/16\/9\/1435"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,9,6]]},"references-count":52,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2016,9]]}},"alternative-id":["s16091435"],"URL":"https:\/\/doi.org\/10.3390\/s16091435","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,9,6]]}}}