{"id":82279,"date":"2022-11-14T11:21:48","date_gmt":"2022-11-14T16:21:48","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/forest-attribute-estimation-northeastern-canadian-forests-using-quickbird-imagery-shadow-fraction-method\/"},"modified":"2022-11-14T11:21:48","modified_gmt":"2022-11-14T16:21:48","slug":"forest-attribute-estimation-northeastern-canadian-forests-using-quickbird-imagery-shadow-fraction-method","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/forest-attribute-estimation-northeastern-canadian-forests-using-quickbird-imagery-shadow-fraction-method\/","title":{"rendered":"Forest attribute estimation of northeastern Canadian forests using Quickbird imagery and a shadow fraction method"},"content":{"rendered":"\n<p>Published in<strong> Forest Ecology and Management, vol. 266, p.\u00a066-74.<\/strong><\/p>\n<p>This study demonstrates a method for mapping forest stand polygons based on four forest attributes (volume, basal area, height, and crown closure) using shadow fraction values that were estimated from high spatial resolution QuickBird panchromatic images. The method was tested over three test sites in northeastern Canada that were largely dominated by black spruce (<em>Picea mariana<\/em> (Mill.) BSP). The method involved four sets of procedures: (i) estimating shadow fraction from the panchromatic band of QuickBird images; (ii) generating site-specific and global regression models linking shadow fraction with each of the four forest attributes; (iii) mapping the forest attributes as a grid layer (30 \u00d7 30 m) for each test site using the global regression models; and (iv) generating stand polygons from the raster layers. Between 2002 and 2004, 108 ground sample plots were acquired to develop local regression models.<\/p>\n<p>Stand volume maps were produced using both the shadow fraction method and conventional forest stand maps (derived from aerial photo-interpretation) for a test site. Volume patterns were similar, and total volume for the test site differed by only 5.6% between the two maps. Lastly, the raster images derived from the shadow fraction method were used to produce a stand map following guidelines similar to those used by provincial inventory. In all cases, our results suggest that the shadow fraction method is a reliable and convenient way to map forest stand polygons and related attributes of black spruce stands in northeastern Canada.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Forest Ecology and Management, vol. 266, p.\u00a066-74. This study demonstrates a method for mapping forest stand polygons based on four forest attributes (volume, basal area, height, and crown closure) using shadow fraction values that were estimated from high spatial resolution QuickBird panchromatic images. The method was tested over three test sites in northeastern [&hellip;]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[874,1190],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1096],"class_list":["post-82279","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-cartography","cptt_theme-imaging-and-lidar","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-a-leboeuf"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Forest attribute estimation of northeastern Canadian forests using Quickbird imagery and a shadow fraction method - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Forest attribute estimation of northeastern Canadian forests using Quickbird imagery and a shadow fraction method.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/forest-attribute-estimation-northeastern-canadian-forests-using-quickbird-imagery-shadow-fraction-method\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Forest attribute estimation of northeastern Canadian forests using Quickbird imagery and a shadow fraction method - 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