{"id":21567,"date":"2026-07-10T16:35:58","date_gmt":"2026-07-10T14:35:58","guid":{"rendered":"https:\/\/ngi.be\/?page_id=21567"},"modified":"2026-08-06T11:57:34","modified_gmt":"2026-08-06T09:57:34","slug":"lambert-1972","status":"publish","type":"page","link":"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/systemes-de-coordonnees-belges\/lambert-1972\/","title":{"rendered":"Lambert 1972"},"content":{"rendered":"

Contexte et mise en place<\/strong><\/p>\n

Le Lambert 1972 succ\u00e8de au Lambert 1950<\/a> pour en am\u00e9liorer la pr\u00e9cision. Au cours des ann\u00e9es qui ont suivi l\u2019introduction du Lambert 1950, de nouvelles m\u00e9thodes et de nouveaux instruments de mesure plus pr\u00e9cis ont \u00e9t\u00e9 d\u00e9velopp\u00e9s. Cela a permis une triangulation am\u00e9lior\u00e9e sur l\u2019ensemble du territoire belge.<\/p>\n

Le Lambert 1972 a \u00e9t\u00e9 introduit afin d\u2019exploiter au mieux ces nouvelles mesures. Le nouveau syst\u00e8me de coordonn\u00e9es a offert un cadre de r\u00e9f\u00e9rence plus homog\u00e8ne, plus coh\u00e9rent et plus fiable que son pr\u00e9d\u00e9cesseur.<\/p>\n

Applications<\/strong><\/p>\n

Apr\u00e8s son introduction, le Lambert 1972 est devenu le syst\u00e8me de coordonn\u00e9es standard pour un large \u00e9ventail d\u2019applications, notamment les cartes topographiques belges, des bases de donn\u00e9es g\u00e9ographiques des administrations, des entreprises et des services publics. Pendant plusieurs d\u00e9cennies, le Lambert 1972 a constitu\u00e9 la base commune sur laquelle les cartes, plans et donn\u00e9es g\u00e9ographiques en Belgique ont \u00e9t\u00e9 \u00e9labor\u00e9s et \u00e9chang\u00e9s.<\/p>\n

Pertinence actuelle<\/strong><\/p>\n

Bien qu\u2019un syst\u00e8me de coordonn\u00e9es plus moderne, le Lambert 2008<\/a>, ait \u00e9t\u00e9 adopt\u00e9 entre-temps, le Lambert 1972 n\u2019a certainement pas disparu. Une grande partie des jeux de donn\u00e9es, plans et archives existants est encore \u00e9tablie dans le syst\u00e8me Lambert 1972. Les donn\u00e9es historiques et administratives sont g\u00e9n\u00e9ralement enregistr\u00e9es dans ce syst\u00e8me, et de nombreuses cartes et plans plus anciens sont toujours consult\u00e9s quotidiennement.<\/p>\n

Une bonne connaissance du Lambert 1972 et des m\u00e9thodes de transformation disponibles demeure essentielle pour pouvoir continuer \u00e0 interpr\u00e9ter et \u00e0 exploiter de mani\u00e8re fiable les informations existantes.<\/p>\n

Conversion vers le Lambert 2008<\/strong><\/p>\n

Pour la conversion du Lambert 1972 vers le Lambert 2008<\/a>, il existe des m\u00e9thodes de calcul pr\u00e9cises mises \u00e0 disposition par l\u2019IGN. La transformation s\u2019effectue en plusieurs \u00e9tapes, au cours desquelles une grille de correction est appliqu\u00e9e afin de compenser les d\u00e9formations apparues lors de la cr\u00e9ation du Lambert 1972.<\/p>\n

L\u2019IGN recommande d\u2019utiliser l\u2019application en ligne cConvert pour cette conversion, car tous les logiciels de transformation externes n\u2019int\u00e8grent pas cette grille de correction. Vous trouverez plus d\u2019informations sur les m\u00e9thodes et outils disponibles sur la page web \u00ab Transformation entre syst\u00e8mes de coordonn\u00e9es<\/a> \u00bb.<\/p>\n

\"\"<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Contexte et mise en place Le Lambert 1972 succ\u00e8de au Lambert 1950 pour en am\u00e9liorer la pr\u00e9cision. Au cours des ann\u00e9es qui ont suivi l\u2019introduction du Lambert 1950, de nouvelles m\u00e9thodes et de nouveaux instruments de mesure plus pr\u00e9cis ont \u00e9t\u00e9 d\u00e9velopp\u00e9s. Cela a permis une triangulation am\u00e9lior\u00e9e sur l\u2019ensemble du territoire belge. Le Lambert…<\/p>\n","protected":false},"author":19,"featured_media":0,"parent":21561,"menu_order":24,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-21567","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nLambert 1972 - 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\/systemes-de-coordonnees-belges\/lambert-1972\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Lambert 1972 - IGN\" \/>\n<meta property=\"og:description\" content=\"Contexte et mise en place Le Lambert 1972 succ\u00e8de au Lambert 1950 pour en am\u00e9liorer la pr\u00e9cision. Au cours des ann\u00e9es qui ont suivi l\u2019introduction du Lambert 1950, de nouvelles m\u00e9thodes et de nouveaux instruments de mesure plus pr\u00e9cis ont \u00e9t\u00e9 d\u00e9velopp\u00e9s. Cela a permis une triangulation am\u00e9lior\u00e9e sur l\u2019ensemble du territoire belge. 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