{"id":315,"date":"2020-02-26T16:26:50","date_gmt":"2020-02-26T15:26:50","guid":{"rendered":"https:\/\/www.ngi.be\/website\/\/?page_id=315"},"modified":"2021-02-11T12:19:05","modified_gmt":"2021-02-11T11:19:05","slug":"donnees-de-reference-vectorielles","status":"publish","type":"page","link":"https:\/\/ngi.be\/fr\/offre\/geodonnees-numeriques\/donnees-de-reference-vectorielles\/","title":{"rendered":"Donn\u00e9es de r\u00e9f\u00e9rence vectorielles"},"content":{"rendered":"\r\n<p class=\"wp-block-paragraph\">Les donn\u00e9es vectorielles sont utilis\u00e9es afin de conserver des donn\u00e9es g\u00e9ographiques. Les structures cartographiques sont sauvegard\u00e9es num\u00e9riquement \u00e0 l&#8217;aide de points, de lignes et de plans dans diff\u00e9rentes couches de donn\u00e9es. L&#8217;IGN fournit ses donn\u00e9es vectorielles de r\u00e9f\u00e9rence sous forme de :<\/p>\r\n<ul style=\"text-align: justify;\">\r\n<li><strong>Points<\/strong> : une s\u00e9rie d&#8217;\u00e9l\u00e9ments sont repr\u00e9sent\u00e9s dans la base de donn\u00e9es comme des points (par ex. des poteaux, des pyl\u00f4nes de t\u00e9l\u00e9communication, des tours, etc.). Ce point est d\u00e9termin\u00e9 au moyen de coordonn\u00e9es (x,y) dans un tri\u00e8dre li\u00e9 \u00e0 la projection conique conforme Lambert 2008.<\/li>\r\n<li><strong>Lignes<\/strong> : les \u00e9l\u00e9ments lin\u00e9aires sont compos\u00e9s d&#8217;une s\u00e9rie ordonn\u00e9e de coordonn\u00e9es (x,y) avec un d\u00e9but et une fin.<\/li>\r\n<li><strong>Polygones<\/strong> : les polygones sont d\u00e9finis par une s\u00e9rie de coordonn\u00e9es d\u00e9finissant la (les) ligne(s) qu&#8217;ils d\u00e9limitent.<\/li>\r\n<\/ul>\r\n<p style=\"text-align: justify;\">En plus des coordonn\u00e9es, chaque \u00e9l\u00e9ment de la base de donn\u00e9es est pourvu d&#8217;une s\u00e9rie d&#8217;attributs permettant de l&#8217;identifier.<\/p>\r\n","protected":false},"excerpt":{"rendered":"<p>Les donn\u00e9es vectorielles sont utilis\u00e9es pour stocker des donn\u00e9es spatiales, les structures cartographiques sont stock\u00e9es num\u00e9riquement sur la base des points, des lignes et des surfaces dans diff\u00e9rentes couches de donn\u00e9es.<\/p>\n","protected":false},"author":1,"featured_media":1126,"parent":311,"menu_order":79,"comment_status":"closed","ping_status":"closed","template":"tpl-product.php","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-315","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - 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