{"version":"1.0","provider_name":"IGN","provider_url":"https:\/\/ngi.be\/fr\/","author_name":"Babs Carpentier","author_url":"https:\/\/ngi.be\/fr\/author\/babs-carpentier\/","title":"R\u00e9f\u00e9rence altim\u00e9trique - IGN","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"ErvLqScLsL\"><a href=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/reference-altimetrique\/\">R\u00e9f\u00e9rence altim\u00e9trique<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/ngi.be\/fr\/offre\/les-services\/services-geodesiques\/reference-altimetrique\/embed\/#?secret=ErvLqScLsL\" width=\"600\" height=\"338\" title=\"&#8220;R\u00e9f\u00e9rence altim\u00e9trique&#8221; &#8212; IGN\" data-secret=\"ErvLqScLsL\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/ngi.be\/wp\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"Les altitudes sont toujours exprim\u00e9es par rapport \u00e0 un niveau de r\u00e9f\u00e9rence (le \u00ab\u00a0niveau z\u00e9ro\u00a0\u00bb). En Belgique, ce niveau z\u00e9ro correspond au niveau moyen de la mer \u00e0 mar\u00e9e basse \u00e0 Ostende, mesur\u00e9 entre 1834 et 1853. Il a servi de base \u00e0 la d\u00e9termination des altitudes des rep\u00e8res altim\u00e9triques lors du Deuxi\u00e8me Nivellement G\u00e9n\u00e9ral..."}