{"id":11239,"date":"2023-07-20T09:00:00","date_gmt":"2023-07-20T07:00:00","guid":{"rendered":"https:\/\/www.sigterritoires.fr\/?p=11239"},"modified":"2023-07-24T01:59:03","modified_gmt":"2023-07-23T23:59:03","slug":"chargement-des-donnees-lidar-hd-ign-dans-qgis","status":"publish","type":"post","link":"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/","title":{"rendered":"Chargement des donn\u00e9es Lidar HD IGN dans QGis"},"content":{"rendered":"\n<p>Dans cet article vous trouverez, pas \u00e0 pas, comment t\u00e9l\u00e9charger les donn\u00e9es LIDAR HD de l&rsquo;IGN et les charger dans QGis . Nous verrons le t\u00e9l\u00e9chargement des deux type de donn\u00e9es disponibles : nuages de points bruts et class\u00e9s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tutoriel : LIDAR HD avec QGIS 3.32<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.sigterritoires.fr\/index.php\/donnees-lidar-dans-qgis-3-32\/\" title=\"1- Les donn\u00e9es LIDAR dans QGis 3.32\">1- Les donn\u00e9es LIDAR dans QGis 3.32<\/a><\/p>\n\n\n\n<p>2- T\u00e9l\u00e9charger les donn\u00e9es LIDAR HD de l&rsquo;IGN et les charger dans QGis<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"jetpack-video-wrapper\"><span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" class=\"youtube-player\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/-w6vMwiFyPY?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=fr-FR&#038;autohide=2&#038;wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\" sandbox=\"allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox\"><\/iframe><\/span><\/div>\n<\/div><figcaption class=\"wp-element-caption\">Retrouvez cette vid\u00e9o ainsi que beaucoup d&rsquo;autres sur notre cha\u00eene Youtube : <a href=\"https:\/\/www.youtube.com\/@sigterritoires\">https:\/\/www.youtube.com\/@sigterritoires<\/a><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">T\u00e9l\u00e9chargement des donn\u00e9es<\/h2>\n\n\n\n<p>Vous pouvez t\u00e9l\u00e9charger les donn\u00e9es Lidar de l&rsquo;IGN \u00e0 partir de l&rsquo;adresse :<a href=\"https:\/\/geoservices.ign.fr\/lidarhd\">https:\/\/geoservices.ign.fr\/lidarhd<\/a>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"411\" data-attachment-id=\"11240\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-104000\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?fit=1148%2C738&amp;ssl=1\" data-orig-size=\"1148,738\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-104000\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?fit=640%2C411&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?resize=640%2C411&#038;ssl=1\" alt=\"page geoservices.ign.fr\/lidarhd\" class=\"wp-image-11240\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?resize=1024%2C658&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?resize=300%2C193&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?resize=768%2C494&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?resize=150%2C96&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?resize=233%2C150&amp;ssl=1 233w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104000.png?w=1148&amp;ssl=1 1148w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"507\" height=\"559\" data-attachment-id=\"11241\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-104132\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?fit=507%2C559&amp;ssl=1\" data-orig-size=\"507,559\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-104132\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?fit=507%2C559&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?resize=507%2C559&#038;ssl=1\" alt=\"choix ign du type de donn\u00e9es \u00e0 t\u00e9l\u00e9charger\" class=\"wp-image-11241\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?w=507&amp;ssl=1 507w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?resize=272%2C300&amp;ssl=1 272w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-104132.png?resize=136%2C150&amp;ssl=1 136w\" sizes=\"auto, (max-width: 507px) 100vw, 507px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>Vous trouverez \u00e0 droite un lien d&rsquo;acc\u00e8s aux produits LIDAR avec deux options: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Donn\u00e9es class\u00e9es<\/li>\n\n\n\n<li>Donn\u00e9es brutes<\/li>\n<\/ul>\n\n\n\n<p>Les <strong>donn\u00e9es brutes<\/strong> , comme son nom l&rsquo;indique, contiennent tous les points LIDAR avec une seule cat\u00e9gorie : <strong><em>non class\u00e9.<\/em><\/strong><\/p>\n\n\n\n<p>Les fichiers <strong>Donn\u00e9es class\u00e9es<\/strong> ont, quant \u00e0 eux, subi un traitement de classification \u00e0 l&rsquo;issue duquel chaque point du nuage de points poss\u00e8de une valeur de classe. Cette classe indique \u00e0 quel type d&rsquo;entit\u00e9 correspond ce point.<\/p>\n\n\n\n<p>La classification utilis\u00e9e par l&rsquo;IGN est la suivante:<\/p>\n\n\n\n<p>Classification du nuage : 11 classes respectant les sp\u00e9cifications ASPRS.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Non class\u00e9. (1)<\/li>\n\n\n\n<li>Sol (2)<\/li>\n\n\n\n<li>V\u00e9g\u00e9tation basse (3) 0-50cm<\/li>\n\n\n\n<li>V\u00e9g\u00e9tation moyenne (4) 50 cm-1,50m<\/li>\n\n\n\n<li>V\u00e9g\u00e9tation haute (5) +1,50 m<\/li>\n\n\n\n<li>B\u00e2timent (6)<\/li>\n\n\n\n<li>Eau (9)<\/li>\n\n\n\n<li>Pont (17)<\/li>\n\n\n\n<li>Sursol p\u00e9renne, (64)<\/li>\n\n\n\n<li>Artefacts (65)<\/li>\n\n\n\n<li>Points virtuels (66)<br>NB : Dans le cas de donn\u00e9es brutes LiDAR HD, l\u2019attribut Classe a \u00e9t\u00e9 conserv\u00e9 mais la valeur par<br>d\u00e9faut est fix\u00e9e \u00e0 Non Class\u00e9 (1).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">T\u00e9l\u00e9chargement des donn\u00e9es brutes<\/h2>\n\n\n\n<p>En cliquant sur Donn\u00e9es brutes vous avez une carte avec l&rsquo;affichage des zones couvertes par le LIDAR HD<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"376\" data-attachment-id=\"11243\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-105219\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?fit=1117%2C656&amp;ssl=1\" data-orig-size=\"1117,656\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-105219\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?fit=640%2C376&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?resize=640%2C376&#038;ssl=1\" alt=\"carte de t\u00e9l\u00e9chargement lidar ign donn\u00e9es brutes\" class=\"wp-image-11243\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?resize=1024%2C601&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?resize=300%2C176&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?resize=768%2C451&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?resize=150%2C88&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?resize=250%2C147&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105219.png?w=1117&amp;ssl=1 1117w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Pour d\u00e9terminer les donn\u00e9es \u00e0 charger, vous devez zoomer sur votre zone d&rsquo;int\u00e9r\u00eat et cliquer sur la dalle souhait\u00e9e. Le message \u00e0 droite de la carte change pour vous permettre de t\u00e9l\u00e9charger la dalle choisie.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"363\" data-attachment-id=\"11244\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-105633\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?fit=1153%2C653&amp;ssl=1\" data-orig-size=\"1153,653\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-105633\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?fit=640%2C363&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?resize=640%2C363&#038;ssl=1\" alt=\"s\u00e9lection ign tuile lidar \u00e0 charger donn\u00e9es brutes\" class=\"wp-image-11244\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?resize=1024%2C580&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?resize=300%2C170&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?resize=768%2C435&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?resize=150%2C85&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?resize=250%2C142&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-105633.png?w=1153&amp;ssl=1 1153w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Le r\u00e9sultat du t\u00e9l\u00e9chargement est bien un fichier compress\u00e9 de type 7z. A l&rsquo;int\u00e9rieur vous trouverez un r\u00e9pertoire contenant quatre semis de nuages de points, au format laz.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"158\" data-attachment-id=\"11245\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-110107\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?fit=2855%2C705&amp;ssl=1\" data-orig-size=\"2855,705\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-110107\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?fit=640%2C158&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=640%2C158&#038;ssl=1\" alt=\"fichier donn\u00e9es brutes lidar ign t\u00e9l\u00e9charg\u00e9\" class=\"wp-image-11245\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=1024%2C253&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=300%2C74&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=768%2C190&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=1536%2C379&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=2048%2C506&amp;ssl=1 2048w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=150%2C37&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?resize=250%2C62&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110107.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">T\u00e9l\u00e9chargement des donn\u00e9es class\u00e9es<\/h2>\n\n\n\n<p>En cliquant sur Donn\u00e9es class\u00e9es vous avez une carte avec l&rsquo;affichage des zones couvertes par le LIDAR<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"358\" data-attachment-id=\"11246\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-110823\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?fit=1166%2C653&amp;ssl=1\" data-orig-size=\"1166,653\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-110823\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?fit=640%2C358&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?resize=640%2C358&#038;ssl=1\" alt=\"carte de t\u00e9l\u00e9chargement lidar ign donn\u00e9es class\u00e9es\" class=\"wp-image-11246\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?resize=1024%2C573&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?resize=300%2C168&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?resize=768%2C430&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?resize=250%2C140&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-110823.png?w=1166&amp;ssl=1 1166w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Pour d\u00e9terminer les donn\u00e9es \u00e0 charger, vous devez zoomer sur votre zone d&rsquo;int\u00e9r\u00eat et cliquer sur la dalle souhait\u00e9e. Le message \u00e0 droite de la carte change pour vous permettre de t\u00e9l\u00e9charger la dalle choisie.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"362\" data-attachment-id=\"11248\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-111034-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?fit=1141%2C645&amp;ssl=1\" data-orig-size=\"1141,645\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-111034-1\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?fit=640%2C362&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?resize=640%2C362&#038;ssl=1\" alt=\"s\u00e9lection ign tuile lidar \u00e0 charger donn\u00e9es class\u00e9es\" class=\"wp-image-11248\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?resize=1024%2C579&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?resize=300%2C170&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?resize=768%2C434&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?resize=150%2C85&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?resize=250%2C141&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111034-1.png?w=1141&amp;ssl=1 1141w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Le r\u00e9sultat du t\u00e9l\u00e9chargement est  un fichier avec un seul semis de points au format copc.laz.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"181\" data-attachment-id=\"11249\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/capture-decran-2023-07-14-111306\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?fit=758%2C214&amp;ssl=1\" data-orig-size=\"758,214\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Capture-decran-2023-07-14-111306\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?fit=640%2C181&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?resize=640%2C181&#038;ssl=1\" alt=\"fichier donn\u00e9es class\u00e9es lidar ign t\u00e9l\u00e9charg\u00e9\" class=\"wp-image-11249\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?w=758&amp;ssl=1 758w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?resize=300%2C85&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?resize=150%2C42&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/Capture-decran-2023-07-14-111306.png?resize=250%2C71&amp;ssl=1 250w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Les formats des fichiers de nuages de points<\/h2>\n\n\n\n<p><strong><em>Le <a href=\"https:\/\/en.wikipedia.org\/wiki\/LAS_file_format\" title=\"format LAS\">format LAS<\/a> <\/em><\/strong>(LASer) est un format de fichier con\u00e7u pour l&rsquo;\u00e9change et l&rsquo;archivage de donn\u00e9es de nuages de points lidar. Il s&rsquo;agit d&rsquo;un format binaire ouvert sp\u00e9cifi\u00e9 par l&rsquo;American Society for Photogrammetry and Remote Sensing (ASPRS). Le format est largement utilis\u00e9 et consid\u00e9r\u00e9 comme une norme industrielle pour les donn\u00e9es lidar.<\/p>\n\n\n\n<p><strong><em>Un fichier LAZ<\/em><\/strong> est un fichier .LAS  compress\u00e9. Il a \u00e9t\u00e9 compress\u00e9 afin de pouvoir \u00eatre plus facilement stock\u00e9 et partag\u00e9 avec d&rsquo;autres. Les fichiers LAZ repr\u00e9sentent g\u00e9n\u00e9ralement moins de 20 % de la taille du fichier LAS \u00e0 partir duquel ils ont \u00e9t\u00e9 cr\u00e9\u00e9s.<\/p>\n\n\n\n<p><strong><em>Les fichiers copc<\/em><\/strong> : Les donn\u00e9es des nuages de points dans les formats couramment utilis\u00e9s tels que LAS sont des ensembles assez simples de points qui ne sont associ\u00e9s \u00e0 aucune structure de donn\u00e9es d\u2019indexation, et l\u2019ordre des points peut \u00eatre arbitraire. Par cons\u00e9quent, il faut construire une telle structure de donn\u00e9es d\u2019indexation lors de l\u2019ouverture de ces fichiers afin de pouvoir les restituer. Dans le cadre de l\u2019indexation, il faut r\u00e9organiser les points afin de pouvoir y acc\u00e9der rapidement lors du rendu. Une fois l\u2019indexation termin\u00e9e, nous avons une structure de donn\u00e9es arborescente o\u00f9 chaque n\u0153ud contient un sous-ensemble du nuage de points.<\/p>\n\n\n\n<p>Les index copc correspondent \u00e0 des <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Octree\" title=\"octrees \">octrees <\/a>: des arbres avec syst\u00e9matiquement huit n\u0153uds fils.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"344\" data-attachment-id=\"11251\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/600px-octree2-svg\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?fit=600%2C344&amp;ssl=1\" data-orig-size=\"600,344\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"600px-Octree2.svg\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?fit=600%2C344&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?resize=600%2C344&#038;ssl=1\" alt=\"cube octree\" class=\"wp-image-11251\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?w=600&amp;ssl=1 600w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?resize=300%2C172&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?resize=150%2C86&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/600px-Octree2.svg.png?resize=250%2C143&amp;ssl=1 250w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n\n\n\n<p>Ce type d&rsquo;arbre correspond bien aux objets 3D : Quand on a un cube, qui repr\u00e9sente notre univers 3D, on d\u00e9termine un point central \u00e0 partir duquel nous pouvons diviser notre cube en 8 cubes, chacun de ces cubes pouvant \u00eatre divis\u00e9 en 8 cubes et ainsi successivement.<br>C&rsquo;est cela un octree et c&rsquo;est le format de fichier index\u00e9 utilis\u00e9 par QGis pour les fichiers LIDAR.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Chargement des nuages de points dans QGis<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Chargement des donn\u00e9es class\u00e9es<\/h3>\n\n\n\n<p>Celui ci est le cas le plus simple. Les donn\u00e9es sont dans des fichiers individuels avec l&rsquo;extension .copc.laz .<\/p>\n\n\n\n<p>Cela veut dire que les fichiers sont compress\u00e9s mais qu&rsquo;ils ont d\u00e9j\u00e0 un index de type octree pr\u00e9sent.<\/p>\n\n\n\n<p>Vous pouvez charger ces donn\u00e9es directement, par un cliquer-d\u00e9placer dans le panneau des couches:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"360\" data-attachment-id=\"11254\" data-permalink=\"https:\/\/www.sigterritoires.fr\/chargement_donnees_classees_ign\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?fit=3842%2C2160&amp;ssl=1\" data-orig-size=\"3842,2160\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"chargement_donnees_classees_ign\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?fit=640%2C360&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=640%2C360&#038;ssl=1\" alt=\"affichage qgis donn\u00e9es class\u00e9es lidar ign\" class=\"wp-image-11254\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=1536%2C864&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=2048%2C1151&amp;ssl=1 2048w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?resize=250%2C141&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_classees_ign.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>La symbologie d&rsquo;affichage est configur\u00e9e directement sur l&rsquo;option \u00ab\u00a0classification\u00a0\u00bb et vous pouvez voir les points avec la symbologie correspondante.<\/p>\n\n\n\n<p>Quand vous verrez l&rsquo;extension .copc dans un fichier, avec une autre extension .las ou .laz, le chargement se fait directement et instantan\u00e9ment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Chargement des donn\u00e9es brutes<\/h3>\n\n\n\n<p>Avant de pouvoir charger ce type de donn\u00e9es vous devez d\u00e9compresser le fichier 7z t\u00e9l\u00e9charg\u00e9. Une fois d\u00e9compress\u00e9, vous aurez dans le nouveau r\u00e9pertoire quatre semis de points:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"195\" data-attachment-id=\"11255\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/decompression_donnees_brutes_ign\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?fit=907%2C277&amp;ssl=1\" data-orig-size=\"907,277\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"decompression_donnees_brutes_ign\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?fit=640%2C195&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?resize=640%2C195&#038;ssl=1\" alt=\"d\u00e9compression donn\u00e9es brutes lidar ign\" class=\"wp-image-11255\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?w=907&amp;ssl=1 907w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?resize=300%2C92&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?resize=768%2C235&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?resize=150%2C46&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/decompression_donnees_brutes_ign.png?resize=250%2C76&amp;ssl=1 250w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Les fichiers de donn\u00e9es brutes sont au format .laz mais il n&rsquo;y a pas d&rsquo;index pr\u00e9sent (.copc).<\/p>\n\n\n\n<p>Quand vous chargez un de ces fichiers dans QGis vous aurez un \u00e9cran comme celui-ci:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"360\" data-attachment-id=\"11256\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/chargement_donnees_brutes_ign\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?fit=3842%2C2160&amp;ssl=1\" data-orig-size=\"3842,2160\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"chargement_donnees_brutes_ign\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?fit=640%2C360&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=640%2C360&#038;ssl=1\" alt=\"affichage qgis emprise donn\u00e9es brutes lidar ign\" class=\"wp-image-11256\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=1536%2C864&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=2048%2C1151&amp;ssl=1 2048w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?resize=250%2C141&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/chargement_donnees_brutes_ign.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Vous aurez imm\u00e9diatement le cadre d&#8217;emprise des donn\u00e9es, et une barre de d\u00e9filement en bas de la fen\u00eatre. Cette barre indique l&rsquo;avancement de la cr\u00e9ation de l&rsquo;index copc pour le nuage de points. Ce n&rsquo;est qu&rsquo;une fois termin\u00e9 ce traitement que vous aurez l&rsquo;affichage des points:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"360\" data-attachment-id=\"11258\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/points_donnees_brutes_ign-1\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?fit=3842%2C2160&amp;ssl=1\" data-orig-size=\"3842,2160\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"points_donnees_brutes_ign-1\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?fit=640%2C360&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=640%2C360&#038;ssl=1\" alt=\"affichage qgis donn\u00e9es brutes lidar ign\" class=\"wp-image-11258\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=1536%2C864&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=2048%2C1151&amp;ssl=1 2048w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=150%2C84&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?resize=250%2C141&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Vous remarquerez alors qu&rsquo;un nouveau fichier a \u00e9t\u00e9 cr\u00e9\u00e9, avec le m\u00eame noms mais avec l&rsquo;extension .copc.<\/p>\n\n\n\n<p>C&rsquo;est ce fichier qui est utilis\u00e9 par QGis. Vous pouvez garder le fichier d&rsquo;origine ou l&rsquo;effacer, mais le fichier d&rsquo;origine n&rsquo;a plus aucune utilit\u00e9 avec QGis.. Si vous le chargez \u00e0 nouveau dans QGis, c&rsquo;est le fichier copc qui sera charg\u00e9 \u00e0 sa place.<\/p>\n\n\n\n<p>Par d\u00e9faut la symbologie est configur\u00e9e sur l&rsquo;option \u00ab\u00a0Attribut par rampe\u00a0\u00bb et elle affiche les valeurs de Z.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La symbologie QGis pour les nuages de points<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"256\" data-attachment-id=\"11259\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/option_symbologie_qgis_lidar\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?fit=1995%2C796&amp;ssl=1\" data-orig-size=\"1995,796\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"option_symbologie_qgis_lidar\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?fit=640%2C256&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=640%2C256&#038;ssl=1\" alt=\"types de symbologie qgis nuages de points\" class=\"wp-image-11259\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=1024%2C409&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=300%2C120&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=768%2C306&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=1536%2C613&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=150%2C60&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?resize=250%2C100&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?w=1995&amp;ssl=1 1995w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/option_symbologie_qgis_lidar.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Vous avez quatre types de symbologie disponibles pour les nuages de points. <\/p>\n\n\n\n<p>Le premi\u00e8re est \u00ab\u00a0Emprise uniquement\u00a0\u00bb qui permet de travailler avec de nombreux nuages de points sans surcharger les temps d&rsquo;affichage.<\/p>\n\n\n\n<p>Les autres trois types d&rsquo;affichage se r\u00e9f\u00e8rent aux trois grands types de donn\u00e9es pr\u00e9sentes dans les points LIDAR:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les attributs de position et de signal<\/li>\n\n\n\n<li>Des valeurs RVB affect\u00e9s aux points \u00e0 posteriori<\/li>\n\n\n\n<li>Les r\u00e9sultats de la classification des points.<\/li>\n<\/ul>\n\n\n\n<p>Si vous choisissez Attribut par rampe, vous aurez la liste des attributs disponibles:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?ssl=1\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"279\" data-attachment-id=\"11260\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/chargement-des-donnees-lidar-hd-ign-dans-qgis\/attributs_points_lidar\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?fit=1994%2C871&amp;ssl=1\" data-orig-size=\"1994,871\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"attributs_points_lidar\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?fit=640%2C279&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=640%2C279&#038;ssl=1\" alt=\"attributs symbologie nuage de points lidar\" class=\"wp-image-11260\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=1024%2C447&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=300%2C131&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=768%2C335&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=1536%2C671&amp;ssl=1 1536w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=150%2C66&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?resize=250%2C109&amp;ssl=1 250w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?w=1994&amp;ssl=1 1994w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?w=1280&amp;ssl=1 1280w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/attributs_points_lidar.png?w=1920&amp;ssl=1 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/figure>\n\n\n\n<p>Remarque: vous observerez que la classification est un attribut du nuage de points. Si vous s\u00e9lectionnez Attribut par rampe et la classification vous pourrez affecter une rampe de couleur \u00e0 vous \u00e0 la classification. Par contre en s\u00e9lectionnant l&rsquo;option Classification vous aurez par d\u00e9faut les couleurs et \u00e9tiquettes standard .<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans cet article vous trouverez, pas \u00e0 pas, comment t\u00e9l\u00e9charger les donn\u00e9es LIDAR HD de l&rsquo;IGN et les charger dans QGis . Nous verrons le t\u00e9l\u00e9chargement des deux type de donn\u00e9es disponibles : nuages de points&hellip;<\/p>\n","protected":false},"author":1,"featured_media":11258,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"give_campaign_id":0,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"sfsi_plus_gutenberg_text_before_share":"","sfsi_plus_gutenberg_show_text_before_share":"","sfsi_plus_gutenberg_icon_type":"","sfsi_plus_gutenberg_icon_alignemt":"","sfsi_plus_gutenburg_max_per_row":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2420],"tags":[1981,2523,2525,58,1713],"class_list":["post-11239","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-lidar","tag-chargement","tag-donnes-lidar","tag-ign-fr","tag-qgis","tag-telechargement"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2023\/07\/points_donnees_brutes_ign-1.png?fit=3842%2C2160&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p6XU0A-2Vh","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts\/11239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/comments?post=11239"}],"version-history":[{"count":0,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts\/11239\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/media\/11258"}],"wp:attachment":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/media?parent=11239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/categories?post=11239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/tags?post=11239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}