{"id":5231,"date":"2022-01-05T17:05:55","date_gmt":"2022-01-05T16:05:55","guid":{"rendered":"https:\/\/ist.blogs.inrae.fr\/afs\/?p=5231"},"modified":"2022-01-05T17:05:55","modified_gmt":"2022-01-05T16:05:55","slug":"mapping-tropical-forest-trees-across-large-areas-with-lightweight-cost-effective-terrestrial-laser-scanning","status":"publish","type":"post","link":"https:\/\/ist.blogs.inrae.fr\/afs\/2022\/01\/05\/mapping-tropical-forest-trees-across-large-areas-with-lightweight-cost-effective-terrestrial-laser-scanning\/","title":{"rendered":"Mapping tropical forest trees across large areas with lightweight cost-effective terrestrial laser scanning"},"content":{"rendered":"<script type='text\/javascript' src='https:\/\/d1bxh8uas1mnw7.cloudfront.net\/assets\/embed.js'><\/script><p><strong><a href=\"https:\/\/ist.blogs.inrae.fr\/afs\/wp-content\/uploads\/sites\/5\/2022\/01\/Tao-2021.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-5234 alignright\" src=\"https:\/\/ist.blogs.inrae.fr\/afs\/wp-content\/uploads\/sites\/5\/2022\/01\/Tao-2021-262x300.png\" alt=\"\" width=\"262\" height=\"300\" srcset=\"https:\/\/ist.blogs.inrae.fr\/afs\/wp-content\/uploads\/sites\/5\/2022\/01\/Tao-2021-262x300.png 262w, https:\/\/ist.blogs.inrae.fr\/afs\/wp-content\/uploads\/sites\/5\/2022\/01\/Tao-2021-640x734.png 640w, https:\/\/ist.blogs.inrae.fr\/afs\/wp-content\/uploads\/sites\/5\/2022\/01\/Tao-2021.png 700w\" sizes=\"auto, (max-width: 262px) 100vw, 262px\" \/><\/a>Key message<\/strong><\/p>\n<p align=\"justify\">We used lightweight terrestrial laser scanning (TLS) to detect over 3000 stems per hectare across a 12-ha permanent forest plot in French Guiana, 81% of them\u2009&lt;\u200910 cm in trunk diameter. This method retrieved 85% of the trees of a classic inventory. Finally, TLS revealed that stem positions of the classic inventory had geolocation errors of up to 6 m.<\/p>\n<p><strong>Abstract<\/strong><\/p>\n<p align=\"justify\"><strong>Context<\/strong> Accurate position mapping of tropical rainforest trees is crucial for baseline studies of tropical forest ecology but is labor-intensive. Terrestrial lidar scanning (TLS) is broadly used in temperate forest inventories, but its use in rainforests is restricted to the determination of individual tree volumes within small survey areas.<br \/>\n<strong>Aims<\/strong> Mapping tree stems across one large (12-ha) rainforest plot, including trees less than 10 cm DBH, and evaluating the precision of traditional mapping approaches.<br \/>\n<strong>Methods<\/strong> We used lightweight TLS, co-registered the acquisitions, and developed a new efficient algorithm to process the TLS data.<br \/>\n<strong>Results<\/strong> We detected 36,422 stems of which 29,665 (81%) were\u2009&lt;\u200910 cm in diameter at breast height (DBH). Of the trees\u2009\u2265\u200910 cm DBH previously censused in the plot, 85% were identified by TLS. Automatic DBH estimation from TLS data had an RMSE of 6 cm. RMSE was improved to 3 cm by a manual verification of the shape and quality of the stem points. The initial census map had substantial bias in tree geolocation with a maximum value around 6 m.<br \/>\n<strong>Conclusion<\/strong> Lightweight TLS technology is a promising tool for the estimation of stem tapering and volume. Here, we show that it also facilitates the establishment of large tropical forest inventories, by improving the positioning of trees, thus increasing the accuracy of forest inventories and their cost-effectiveness.<\/p>\n<p><strong>Keywords<\/strong><br \/>\nForest inventory; Amazon forest; Nouragues; Terrestrial Lidar; Topography; Stem diameter<\/p>\n<div class='altmetric-embed' data-badge-type='donut' data-doi='10.1007\/s13595-021-01113-9'  style='float: right; ' ><\/div>\n<p><strong>Publication<\/strong><br \/>\nTao, S., Labri\u00e8re, N., Calders, K. et al. Mapping tropical forest trees across large areas with lightweight cost-effective terrestrial laser scanning. Annals of Forest Science 78, 103 (2021). <a href=\"https:\/\/doi.org\/10.1007\/s13595-021-01113-9\">https:\/\/doi.org\/10.1007\/s13595-021-01113-9<\/a><\/p>\n<p><strong>For the read-only version of the full text:<\/strong><br \/>\n<a href=\"https:\/\/rdcu.be\/cEpfb\">https:\/\/rdcu.be\/cEpfb<\/a><\/p>\n<p><strong>Data and\/or Code availability<\/strong><br \/>\nThe datasets generated by this study and data processing codes have been made publicly available at [<a href=\"https:\/\/github.com\/TonySl\/BLK360_TLS\">github.com\/TonySl\/BLK360_TLS<\/a>].<\/p>\n<p><strong>Handling Editor<\/strong><br \/>\nJohn M Lhotka<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key message We used lightweight terrestrial laser scanning (TLS) to detect over 3000 stems per hectare across a 12-ha permanent forest plot in French Guiana, 81% of them\u2009&lt;\u200910 cm in trunk diameter. This method retrieved 85% of the trees of a classic inventory. Finally, TLS revealed that stem positions of the classic inventory had geolocation [&hellip;]<\/p>\n","protected":false},"author":109,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,110,15],"tags":[],"class_list":["post-5231","post","type-post","status-publish","format-standard","hentry","category-article-type","category-data-in-repository","category-research-paper","cat-14-id","cat-110-id","cat-15-id"],"_links":{"self":[{"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/posts\/5231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/users\/109"}],"replies":[{"embeddable":true,"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/comments?post=5231"}],"version-history":[{"count":3,"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/posts\/5231\/revisions"}],"predecessor-version":[{"id":5235,"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/posts\/5231\/revisions\/5235"}],"wp:attachment":[{"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/media?parent=5231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/categories?post=5231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ist.blogs.inrae.fr\/afs\/wp-json\/wp\/v2\/tags?post=5231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}