{"id":14425,"date":"2025-07-09T10:00:00","date_gmt":"2025-07-09T08:00:00","guid":{"rendered":"https:\/\/www.sigterritoires.fr\/?p=14425"},"modified":"2025-06-30T15:49:40","modified_gmt":"2025-06-30T13:49:40","slug":"passage-de-qgis-3-a-qgis-4","status":"publish","type":"post","link":"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/","title":{"rendered":"Passage de QGIS 3 \u00e0 QGIS 4"},"content":{"rendered":"\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"De_QGIS_3x_a_QGIS_40_%E2%80%93_Un_bond_technologique\"><\/span>De QGIS 3.x \u00e0 QGIS 4.0 \u2013 Un bond technologique<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contenu <\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#De_QGIS_3x_a_QGIS_40_%E2%80%93_Un_bond_technologique\" >De QGIS 3.x \u00e0 QGIS 4.0 \u2013 Un bond technologique<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#Pourquoi_passer_a_QGIS_4\" >Pourquoi passer \u00e0 QGIS 4 ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#Ce_qui_change_cote_utilisateurs\" >Ce qui change c\u00f4t\u00e9 utilisateurs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#Impacts_pour_les_developpeurs_de_plugins\" >Impacts pour les d\u00e9veloppeurs de plugins<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#Calendrier_de_transition\" >Calendrier de transition<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#Tester_QGIS%E2%80%AF4_des_maintenant\" >Tester QGIS\u202f4 d\u00e8s maintenant<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.sigterritoires.fr\/index.php\/passage-de-qgis-3-a-qgis-4\/#En_resume\" >En r\u00e9sum\u00e9<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Pourquoi_passer_a_QGIS_4\"><\/span>Pourquoi passer \u00e0 QGIS 4 ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>La version <strong>QGIS\u202f4.0<\/strong>, attendue pour octobre 2025, marque un virage strat\u00e9gique. Son objectif principal est de <strong>faire la bascule vers Qt\u202f6<\/strong>, la nouvelle version du framework sous-jacent(<a href=\"https:\/\/blog.qgis.org\/2025\/04\/17\/qgis-is-moving-to-qt6-and-launching-qgis-4-0\/?utm_source=chatgpt.com\">blog.qgis.org<\/a>). Ce changement garantit\u202f:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Une <strong>modernisation<\/strong> du code (compatible avec les biblioth\u00e8ques r\u00e9centes),<\/li>\n\n\n\n<li>Une <strong>meilleure performance, maintenabilit\u00e9 et s\u00e9curit\u00e9<\/strong> \u00e0 long terme,<\/li>\n\n\n\n<li>L\u2019arr\u00eat du support commercial de Qt\u202f5.15 en mai\u202f2025(<a href=\"https:\/\/blog.qgis.org\/2025\/04\/17\/qgis-is-moving-to-qt6-and-launching-qgis-4-0\/?utm_source=chatgpt.com\">blog.qgis.org<\/a>).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ce_qui_change_cote_utilisateurs\"><\/span>Ce qui change c\u00f4t\u00e9 utilisateurs<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u00c9l\u00e9ment<\/th><th>QGIS\u202f3.x (Qt\u202f5)<\/th><th>QGIS\u202f4.0 (Qt\u202f6)<\/th><\/tr><\/thead><tbody><tr><td><strong>Compatibilit\u00e9 plugins<\/strong><\/td><td>LTR\u202f3.40 active jusqu\u2019en mai\u202f2026<\/td><td>Compatibilit\u00e9 assur\u00e9e (APIs d\u00e9pr\u00e9ci\u00e9es encore support\u00e9es)(<a href=\"https:\/\/blog.qgis.org\/2025\/04\/17\/qgis-is-moving-to-qt6-and-launching-qgis-4-0\/?utm_source=chatgpt.com\">blog.qgis.org<\/a>)<\/td><\/tr><tr><td><strong>Fonctionnalit\u00e9s visibles<\/strong><\/td><td>3.x enrichi progressivement<\/td><td>Peu de nouveaut\u00e9s visuelles : focus sur stabilit\u00e9 et Qt\u202f6<\/td><\/tr><tr><td><strong>Interop\u00e9rabilit\u00e9 avec Qt<\/strong><\/td><td>Qt\u202f5 support\u00e9<\/td><td>Qt\u202f6 uniquement, fin du vieux cycle. Bifurcation technologique majeure<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Impacts_pour_les_developpeurs_de_plugins\"><\/span>Impacts pour les d\u00e9veloppeurs de plugins<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Un <strong>guide de migration<\/strong> officiel est en cours (avec un outil <code>pyqt5_to_pyqt6.py<\/code>)(<a href=\"https:\/\/geotribu.fr\/articles\/2025\/2025-01-28_tester-qgis-4-futur-sig-open-source\/?utm_source=chatgpt.com\">geotribu.fr<\/a>).<\/li>\n\n\n\n<li>Le <strong>r\u00e9f\u00e9rentiel de plugins<\/strong> indiquera d\u00e9sormais la compatibilit\u00e9 Qt\u202f6.<\/li>\n\n\n\n<li>Gr\u00e2ce \u00e0 cette d\u00e9cision conservatrice, peu d\u2019adaptations seront \u00e0 pr\u00e9voir pour les plugins existants, sans qu\u2019ils soient totalement r\u00e9\u00e9crits(<a href=\"https:\/\/blog.qgis.org\/2025\/04\/17\/qgis-is-moving-to-qt6-and-launching-qgis-4-0\/?utm_source=chatgpt.com\">blog.qgis.org<\/a>).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Calendrier_de_transition\"><\/span>Calendrier de transition<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>QGIS\u202f3.40 LTR<\/strong> prolong\u00e9 jusqu\u2019en mai 2026.<\/li>\n\n\n\n<li><strong>QGIS\u202f4.0<\/strong> pr\u00e9vu d\u00e9but octobre\u202f2025 (release standard).<\/li>\n\n\n\n<li><strong>QGIS\u202f4.2 LTR<\/strong> pr\u00e9vu d\u00e9but 2026(<a href=\"https:\/\/blog.qgis.org\/2025\/04\/17\/qgis-is-moving-to-qt6-and-launching-qgis-4-0\/?utm_source=chatgpt.com\">blog.qgis.org<\/a>).<\/li>\n<\/ol>\n\n\n\n<p>Cette strat\u00e9gie favorise une <strong>transition en douceur<\/strong> pour les organisations d\u00e9pendantes de la stabilit\u00e9 des versions LTR.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tester_QGIS%E2%80%AF4_des_maintenant\"><\/span>Tester QGIS\u202f4 d\u00e8s maintenant<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Des <strong>builds Qt\u202f6<\/strong> sont d\u00e9j\u00e0 disponibles sur OSGeo4W (Windows) et sur Linux (Fedora notamment)(<a href=\"https:\/\/blog.qgis.org\/2025\/04\/17\/qgis-is-moving-to-qt6-and-launching-qgis-4-0\/?utm_source=chatgpt.com\">blog.qgis.org<\/a>).<\/li>\n\n\n\n<li>macOS sera bient\u00f4t pris en charge.<\/li>\n\n\n\n<li>Encouragez les <strong>tests anticip\u00e9s<\/strong> pour v\u00e9rifier la compatibilit\u00e9 des projets et plugins.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"En_resume\"><\/span>En r\u00e9sum\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>QGIS\u202f4.0<\/strong> est une mise \u00e0 jour majeure <strong>technique<\/strong>, moins visible visuellement.<\/li>\n\n\n\n<li>Les utilisateurs et d\u00e9veloppeurs n\u2019auront <strong>pas \u00e0 r\u00e9apprendre<\/strong> la majeure partie du logiciel.<\/li>\n\n\n\n<li>Le vrai changement se situe dans le <strong>backend<\/strong>, avec Qt\u202f6, une meilleure s\u00e9curit\u00e9 et performance.<\/li>\n\n\n\n<li>Les LTR garantiront un d\u00e9lai confortable pour la transition.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><strong>Prochain pas :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tester un build Qt\u202f6,<\/li>\n\n\n\n<li>V\u00e9rifier la compatibilit\u00e9 de votre environnement et plugins,<\/li>\n\n\n\n<li>Anticiper le passage apr\u00e8s mai\u202f2026, dans un intervalle s\u00e9curis\u00e9.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>De QGIS 3.x \u00e0 QGIS 4.0 \u2013 Un bond technologique Pourquoi passer \u00e0 QGIS 4 ? La version QGIS\u202f4.0, attendue pour octobre 2025, marque un virage strat\u00e9gique. Son objectif principal est de faire la bascule vers&hellip;<\/p>\n","protected":false},"author":1,"featured_media":14428,"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":[62],"tags":[58,1476,3486,3488],"class_list":["post-14425","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-qgis-2","tag-qgis","tag-qgis-3","tag-qgis-4","tag-qt6"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2025\/06\/new_splash_blog_post-1.jpg?fit=1319%2C631&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p6XU0A-3KF","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts\/14425","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=14425"}],"version-history":[{"count":0,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/posts\/14425\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/media\/14428"}],"wp:attachment":[{"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/media?parent=14425"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/categories?post=14425"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sigterritoires.fr\/index.php\/wp-json\/wp\/v2\/tags?post=14425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}