{"id":21585,"date":"2026-07-13T09:11:30","date_gmt":"2026-07-13T07:11:30","guid":{"rendered":"https:\/\/ngi.be\/?page_id=21585"},"modified":"2026-08-06T14:14:57","modified_gmt":"2026-08-06T12:14:57","slug":"autres-systemes-de-coordonnees","status":"publish","type":"page","link":"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/autres-systemes-de-coordonnees\/","title":{"rendered":"Autres syst\u00e8mes de coordonn\u00e9es"},"content":{"rendered":"<p>Outre les\u00a0<a href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/systemes-de-coordonnees-belges\/\" target=\"_blank\" rel=\"noopener\">projections Lambert officielles belges<\/a>, d\u2019autres syst\u00e8mes de r\u00e9f\u00e9rence\u00a0de coordonn\u00e9es sont \u00e9galement\u00a0utilis\u00e9s dans un contexte national, europ\u00e9en et international. Ci-dessous\u00a0un aper\u00e7u succinct des principaux syst\u00e8mes\u00a0de r\u00e9f\u00e9rence de coordonn\u00e9es\u00a0et leurs applications.<\/p>\n<p><strong>ETRS89 (European\u00a0Terrestrial\u00a0Reference System 1989)<\/strong><br \/>\nL\u2019ETRS89 est le syst\u00e8me de r\u00e9f\u00e9rence g\u00e9od\u00e9sique europ\u00e9en\u00a0officiel. Il est fix\u00e9 au segment stable de la plaque tectonique eurasienne. Par cons\u00e9quent, les coordonn\u00e9es des positions en Europe restent stables\u00a0dans le temps. En Belgique,\u00a0l\u2019ETRS89 constitue la base g\u00e9od\u00e9sique du\u00a0<a href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/systemes-de-coordonnees-belges\/lambert-2008\/\" target=\"_blank\" rel=\"noopener\">Lambert 2008<\/a>.<\/p>\n<p>L\u2019ETRS89 est reconnu comme le format d\u2019\u00e9change standard europ\u00e9en pour les coordonn\u00e9es g\u00e9ographiques. Les utilisateurs de r\u00e9seaux RTK-GNSS tels que FLEPOS, WALCORS ou GPSBRU obtiennent automatiquement\u00a0les coordonn\u00e9es\u00a0dans le syst\u00e8me\u00a0ETRS89.<\/p>\n<p><a href=\"https:\/\/epncb.oma.be\/\" target=\"_blank\" rel=\"noopener\">Ici<\/a>,\u00a0vous trouverez plus d\u2019informations sur l\u2019ETRS89.<\/p>\n<p><strong>ITRS (International\u00a0Terrestrial\u00a0Reference System)\u00a0<\/strong><br \/>\nL\u2019ITRS est un syst\u00e8me\u00a0g\u00e9od\u00e9sique\u00a0de r\u00e9f\u00e9rence global. Il constitue la r\u00e9f\u00e9rence scientifique sur laquelle reposent les syst\u00e8mes r\u00e9gionaux tels que ETRS89.\u00a0En raison du d\u00e9placement des plaques continentales, les coordonn\u00e9es exprim\u00e9es en ITRS sont dynamiques : elles changent chaque ann\u00e9e. Pour la Belgique, il s&#8217;agit d\u2019un d\u00e9placement d&#8217;environ 2,5 cm par an en direction du nord-est. L\u2019ITRS est donc moins adapt\u00e9 aux applications nationales ou r\u00e9gionales qui n\u00e9cessitent des coordonn\u00e9es stables.<\/p>\n<p><a href=\"https:\/\/itrf.ign.fr\/en\/homepage\" target=\"_blank\" rel=\"noopener\">Ici<\/a>, vous trouverez plus d\u2019informations sur l\u2019ITRS.<\/p>\n<p><strong>WGS\u00a084 (World\u00a0Geodetic\u00a0System 1984)<\/strong><br \/>\nLe\u00a0WGS\u00a084 est le syst\u00e8me de coordonn\u00e9es mondial dans lequel les satellites GPS expriment leur position. Il est \u00e9troitement li\u00e9 \u00e0 l\u2019ITRS\u00a0et\u00a0est g\u00e9r\u00e9 op\u00e9rationnellement par les \u00c9tats-Unis. Bien\u00a0que\u00a0le\u00a0WGS 84 soit le\u00a0syst\u00e8me de coordonn\u00e9es le plus connu, les coordonn\u00e9es g\u00e9ographiques\u00a0d\u00e9termin\u00e9es\u00a0en Belgique\u00a0via RTK-GNSS\u00a0correspondent g\u00e9n\u00e9ralement, dans la pratique, aux coordonn\u00e9es\u00a0ETRS89.<\/p>\n<p>La diff\u00e9rence entre\u00a0le\u00a0WGS\u00a084 et\u00a0l\u2019ETRS89 est actuellement d\u2019environ 1 m\u00e8tre et augmente chaque ann\u00e9e d\u2019environ 2,5 cm. Pour les applications moins pr\u00e9cises, cette\u00a0diff\u00e9rence n&#8217;est pas toujours importante, mais pour les applications g\u00e9od\u00e9siques professionnelles, elle\u00a0doit \u00eatre consid\u00e9r\u00e9e.<\/p>\n<p><strong>RD (Rijksdriehoeksstelsel)\u00a0<\/strong><br \/>\nLe\u00a0syst\u00e8me triangulaire national (Rijksdriehoeksstelsel\u00a0\/ RD)\u00a0est le syst\u00e8me de coordonn\u00e9es national des Pays-Bas. Bien qu\u2019il ne soit pas utilis\u00e9 en Belgique, le RD est pertinent dans des contextes transfrontaliers et pour des jeux de donn\u00e9es communs.\u00a0La conversion\u00a0entre le RD et\u00a0le\u00a0<a href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/systemes-de-coordonnees-belges\/lambert-2008\/\" target=\"_blank\" rel=\"noopener\">Lambert 2008<\/a> s\u2019effectue via le syst\u00e8me de r\u00e9f\u00e9rence europ\u00e9en ETRS89. Vous trouvez plus d\u2019informations sur les m\u00e9thodes de transformation disponibles sur la page \u00ab\u202f<a href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/transformation-entre-systemes-de-coordonnees\/\" target=\"_blank\" rel=\"noopener\">Transformation entre syst\u00e8mes de coordonn\u00e9es<\/a>\u202f\u00bb.<\/p>\n<p><strong>Projection de Bonne\u00a0<\/strong><br \/>\nAvant l\u2019introduction du\u00a0<a href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/systemes-de-coordonnees-belges\/lambert-1950\/\" target=\"_blank\" rel=\"noopener\">Lambert 1950<\/a>, la projection de Bonne \u00e9tait utilis\u00e9e en Belgique \u00e0 des fins cartographiques.\u00a0Aujourd\u2019hui, cette projection n\u2019est pertinente que pour l\u2019interpr\u00e9tation de\u00a0mat\u00e9riel\u00a0historique cartographique\u00a0datant d\u2019avant 1950.<\/p>\n<p><strong>Coordonn\u00e9es Andries\u00a0<\/strong><br \/>\nLes coordonn\u00e9es Andries\u00a0constituent\u00a0un syst\u00e8me de coordonn\u00e9es non officiel et simplifi\u00e9, utilis\u00e9 en Belgique dans le cadre de la colombophilie\u00a0afin de calculer\u00a0de mani\u00e8re univoque les distances entre les\u00a0pigeonniers et les lieux de l\u00e2cher.\u00a0Ce syst\u00e8me n\u2019a aucune base g\u00e9od\u00e9sique et n\u2019est aujourd\u2019hui\u00a0plus\u00a0pertinent\u00a0que pour l\u2019interpr\u00e9tation et la conversion de donn\u00e9es historiques issues de comp\u00e9titions colombophiles vers des syst\u00e8mes de coordonn\u00e9es officiels.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Outre les\u00a0projections Lambert officielles belges, d\u2019autres syst\u00e8mes de r\u00e9f\u00e9rence\u00a0de coordonn\u00e9es sont \u00e9galement\u00a0utilis\u00e9s dans un contexte national, europ\u00e9en et international. Ci-dessous\u00a0un aper\u00e7u succinct des principaux syst\u00e8mes\u00a0de r\u00e9f\u00e9rence de coordonn\u00e9es\u00a0et leurs applications. ETRS89 (European\u00a0Terrestrial\u00a0Reference System 1989) L\u2019ETRS89 est le syst\u00e8me de r\u00e9f\u00e9rence g\u00e9od\u00e9sique europ\u00e9en\u00a0officiel. Il est fix\u00e9 au segment stable de la plaque tectonique eurasienne. Par cons\u00e9quent,&#8230;<\/p>\n","protected":false},"author":19,"featured_media":0,"parent":656,"menu_order":13,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-21585","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Autres syst\u00e8mes de coordonn\u00e9es - IGN<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/autres-systemes-de-coordonnees\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Autres syst\u00e8mes de coordonn\u00e9es - IGN\" \/>\n<meta property=\"og:description\" content=\"Outre les\u00a0projections Lambert officielles belges, d\u2019autres syst\u00e8mes de r\u00e9f\u00e9rence\u00a0de coordonn\u00e9es sont \u00e9galement\u00a0utilis\u00e9s dans un contexte national, europ\u00e9en et international. 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