{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,8]],"date-time":"2026-05-08T01:29:09Z","timestamp":1778203749934,"version":"3.51.4"},"reference-count":48,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2022,10,18]],"date-time":"2022-10-18T00:00:00Z","timestamp":1666051200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["U1809208"],"award-info":[{"award-number":["U1809208"]}]},{"name":"National Natural Science Foundation of China","award":["32171785"],"award-info":[{"award-number":["32171785"]}]},{"name":"National Natural Science Foundation of China","award":["32201553"],"award-info":[{"award-number":["32201553"]}]},{"name":"National Natural Science Foundation of China","award":["ZY20180201"],"award-info":[{"award-number":["ZY20180201"]}]},{"name":"National Natural Science Foundation of China","award":["2021C02005"],"award-info":[{"award-number":["2021C02005"]}]},{"name":"State Key Laboratory of Subtropical Silviculture","award":["U1809208"],"award-info":[{"award-number":["U1809208"]}]},{"name":"State Key Laboratory of Subtropical Silviculture","award":["32171785"],"award-info":[{"award-number":["32171785"]}]},{"name":"State Key Laboratory of Subtropical Silviculture","award":["32201553"],"award-info":[{"award-number":["32201553"]}]},{"name":"State Key Laboratory of Subtropical Silviculture","award":["ZY20180201"],"award-info":[{"award-number":["ZY20180201"]}]},{"name":"State Key Laboratory of Subtropical Silviculture","award":["2021C02005"],"award-info":[{"award-number":["2021C02005"]}]},{"name":"Key Research and Development Program of Zhejiang Province","award":["U1809208"],"award-info":[{"award-number":["U1809208"]}]},{"name":"Key Research and Development Program of Zhejiang Province","award":["32171785"],"award-info":[{"award-number":["32171785"]}]},{"name":"Key Research and Development Program of Zhejiang Province","award":["32201553"],"award-info":[{"award-number":["32201553"]}]},{"name":"Key Research and Development Program of Zhejiang Province","award":["ZY20180201"],"award-info":[{"award-number":["ZY20180201"]}]},{"name":"Key Research and Development Program of Zhejiang Province","award":["2021C02005"],"award-info":[{"award-number":["2021C02005"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Three dimensional (3D) green volume is an important tree factor used in forest surveys as a prerequisite for estimating aboveground biomass (AGB). In this study, we developed a method for accurately calculating the 3D green volume of single trees from unmanned aerial vehicle laser scanner (ULS) data, using a voxel coupling convex hull by slices algorithm, and compared the results using voxel coupling convex hull by slices algorithm with traditional 3D green volume algorithms (3D convex hull, 3D concave hull (alpha shape), convex hull by slices, voxel and voxel coupling convex hull by slices algorithms) to estimate AGB. Our results showed the following: (1) The voxel coupling convex hull by slices algorithm can accurately estimate the 3D green volume of a single ginkgo tree (RMSE = 11.17 m3); (2) Point cloud density can significantly affect the extraction of 3D green volume; (3) The addition of the 3D green volume parameter can significantly improve the accuracy of the model to estimate AGB, where the highest accuracy was obtained by the voxel coupling convex hull by slices algorithm (CV-R2 = 0.85, RMSE = 11.29 kg, and nRMSE = 15.12%). These results indicate that the voxel coupling convex hull by slices algorithms can more effectively calculate the 3D green volume of a single tree from ULS data. Moreover, our study provides a comprehensive evaluation of the use of ULS 3D green volume for AGB estimation and could significantly improve the estimation accuracy of AGB.<\/jats:p>","DOI":"10.3390\/rs14205211","type":"journal-article","created":{"date-parts":[[2022,10,19]],"date-time":"2022-10-19T00:58:51Z","timestamp":1666141131000},"page":"5211","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["Estimating 3D Green Volume and Aboveground Biomass of Urban Forest Trees by UAV-Lidar"],"prefix":"10.3390","volume":"14","author":[{"given":"Lv","family":"Zhou","sequence":"first","affiliation":[{"name":"Research Center of Forest Management Engineering of State Forestry and Grassland Administration, Beijing Forestry University, Beijing 100083, China"},{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xuejian","family":"Li","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bo","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Xuan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yulin","family":"Gong","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cheng","family":"Tan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9355-2338","authenticated-orcid":false,"given":"Huaguo","family":"Huang","sequence":"additional","affiliation":[{"name":"Research Center of Forest Management Engineering of State Forestry and Grassland Administration, Beijing Forestry University, Beijing 100083, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6765-2279","authenticated-orcid":false,"given":"Huaqiang","family":"Du","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration of Zhejiang Province, Zhejiang A&F University, Hangzhou 311300, China"},{"name":"School of Environmental and Resources Science, Zhejiang A&F University, Hangzhou 311300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Yan, Z., Liu, R., Cheng, L., Zhou, X., Ruan, X., and Xiao, Y. 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