{"id":3705,"date":"2021-08-07T13:09:53","date_gmt":"2021-08-07T11:09:53","guid":{"rendered":"https:\/\/topo4d.be\/quest-ce-quun-gcp\/"},"modified":"2026-07-17T10:04:57","modified_gmt":"2026-07-17T08:04:57","slug":"quest-ce-quun-gcp","status":"publish","type":"post","link":"https:\/\/topo4d.be\/fr\/quest-ce-quun-gcp\/","title":{"rendered":"Qu\u2019est-ce qu\u2019un GCP ?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3705\" class=\"elementor elementor-3705 elementor-1581\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7290723 e-flex e-con-boxed e-con e-parent\" data-id=\"7290723\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7c8de42 elementor-widget elementor-widget-heading\" data-id=\"7c8de42\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Qu\u2019est-ce qu\u2019un GCP ?<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b5e5285 e-flex e-con-boxed e-con e-parent\" data-id=\"b5e5285\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b03465f elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"b03465f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"720\" height=\"960\" src=\"https:\/\/topo4d.be\/wp-content\/uploads\/2021\/08\/gcp.avif\" class=\"attachment-large size-large wp-image-3706\" alt=\"\" srcset=\"https:\/\/topo4d.be\/wp-content\/uploads\/2021\/08\/gcp.avif 720w, https:\/\/topo4d.be\/wp-content\/uploads\/2021\/08\/gcp-225x300.avif 225w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f941fca elementor-widget elementor-widget-text-editor\" data-id=\"f941fca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div>\n<div>\n<div>\n<div>\n<div>\n<div>\n<p>GCP signifie Ground Control Point (point de calage au sol). Il est utilis\u00e9 comme point de r\u00e9f\u00e9rence et de contr\u00f4le pour un lev\u00e9 par drone. <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div>\n<div>\n<div>\n<div>\n<div>\n<blockquote>\n<p><strong>Les GCP peuvent \u00eatre soit trac\u00e9s \u00e0 la peinture, soit mat\u00e9rialis\u00e9s par des cibles fixes. Leur position est cruciale pour la qualit\u00e9 du relev\u00e9.  <\/strong><\/p>\n<\/blockquote>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div>\n<div>\n<div>\n<div>\n<div>\n<p>Comme on peut le voir sur la photo, un GCP peut \u00eatre consid\u00e9r\u00e9 comme une cible au sol dont la position est connue dans un syst\u00e8me sp\u00e9cifique. Cette position (de plusieurs GCP) peut \u00eatre utilis\u00e9e pour orienter un relev\u00e9 par drone ou un relev\u00e9 par scanner laser dans un syst\u00e8me de coordonn\u00e9es d\u00e9fini, ainsi que pour accro\u00eetre la pr\u00e9cision. <\/p>\n<p>Un aspect essentiel de l\u2019utilisation des GCP est qu\u2019ils doivent \u00eatre r\u00e9partis de mani\u00e8re \u00ab \u00e9quitable \u00bb sur la zone \u00e0 relever. Si ce n\u2019est pas le cas, il arrive parfois que le relev\u00e9 soit fauss\u00e9 en fonction de l\u2019emplacement o\u00f9 trop ou trop peu de GCP ont \u00e9t\u00e9 plac\u00e9s. <\/p>\n<p>Les GCP augmentent \u00e9galement la pr\u00e9cision car les coordonn\u00e9es de r\u00e9f\u00e9rence sont connues dans un syst\u00e8me de coordonn\u00e9es avec une pr\u00e9cision de 1 \u00e0 2 cm (selon l\u2019appareil GNSS utilis\u00e9 pour mesurer le GCP). Une photo de drone moyenne prise avec un appareil sans RTK a une pr\u00e9cision de position d\u2019environ 5 m\u00e8tres. Cet \u00e9cart est corrig\u00e9 lors du calcul photogramm\u00e9trique. Les GCP augmentent la pr\u00e9cision de ces calculs.   <\/p>\n<p>L\u2019utilisation de GCP peut \u00e9galement garantir qu\u2019un relev\u00e9 est r\u00e9f\u00e9renc\u00e9 dans un syst\u00e8me de coordonn\u00e9es sp\u00e9cifique, tel que le syst\u00e8me Lambert72, bien connu en Flandre.<\/p>\n<p>Cela serait toutefois \u00e9galement possible avec un drone \u00e9quip\u00e9 du RTK, ce que nous expliquons dans un autre article de blog.<\/p>\n<p>Cependant, les GCP restent l\u2019outil le plus pr\u00e9cis lors des relev\u00e9s par drone car ils offrent une certitude gr\u00e2ce \u00e0 une position mesur\u00e9e au sol avec un appareil sp\u00e9cialis\u00e9.<\/p>\n<p>Le RTK, en revanche, est mesur\u00e9 par un drone via un appareil mobile suspendu dans les airs, ce qui pr\u00e9sente \u00e9galement ses avantages et ses inconv\u00e9nients.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/topo4d.be\/wp-content\/uploads\/2021\/08\/GCP-TOPO4D-298x300-1.avif\" alt=\"\" width=\"298\" height=\"300\"><\/p>\n<div id=\"attachment_9102\">\n<p id=\"caption-attachment-9102\">GCP clair pour un relev\u00e9 par drone par le bureau d\u2019\u00e9tudes de g\u00e9om\u00e8tres TOPO4D<\/p>\n<h2><strong>Conseil de Guillaume, g\u00e9rant de TOPO4D<\/strong><\/h2>\n<\/div>\n<p>\u00ab Utilisez un GCP qui poss\u00e8de un point d\u2019intersection ou un centre clair (avec beaucoup de contraste, par exemple une dalle en damier comme cette <a href=\"https:\/\/www.propelleraero.com\/aeropoints\/\">Propeller Aeropoint<\/a>). Si vous souhaitez toutefois utiliser de la peinture en spray, tracez un L et utilisez syst\u00e9matiquement le coin int\u00e9rieur ou ext\u00e9rieur pour la mesure et le marquage dans les photos.  <\/p>\n<p>Dans la plupart des logiciels comme PIX4D, les GCP sont d\u00e9sormais reconnus automatiquement et vous n\u2019avez plus besoin de les marquer manuellement dans un projet ! Cela fait une grande diff\u00e9rence en termes de rentabilit\u00e9 sur un projet donn\u00e9 ! \u00bb.  <\/p>\n<h2>De combien en avez-vous besoin ?<\/h2>\n<p>Th\u00e9oriquement, un minimum de trois (pour pouvoir orienter, positionner et mettre \u00e0 l\u2019\u00e9chelle le mod\u00e8le correctement dans toutes les directions). Cependant, avec Topo4D, nous recommandons d\u2019en utiliser au moins huit ou neuf, ainsi que quelques autres rep\u00e8res pouvant servir de points de contr\u00f4le (checkpoints). Nous expliquons cela <a href=\"https:\/\/topo4d.be\/fr\/?p=4997&#038;preview=true\">ici<\/a>. Ceux-ci nous permettent de v\u00e9rifier nos relev\u00e9s, les points de contr\u00f4le \u00e9tant toujours ind\u00e9pendants du mod\u00e8le 3D calcul\u00e9 ou du nuage de points 3D.    <\/p>\n<h2>Que puis-je utiliser pour effectuer les mesures ? <\/h2>\n<p>Cela d\u00e9pend uniquement de la pr\u00e9cision souhait\u00e9e. Si vous voulez mesurer des points via RTK (Real-Time Kinematic), la pr\u00e9cision absolue peut atteindre un \u00e0 deux centim\u00e8tres. Des syst\u00e8mes GNSS sont disponibles \u00e0 cet effet, notamment les syst\u00e8mes de Trimble ou le Leica <a href=\"https:\/\/leica-geosystems.com\/nl-be\/products\/gnss-systems\/smart-antennas\/leica-gs18i\">GS18I<\/a> \/ GS18T (que nous utilisons nous-m\u00eames). Si vous avez occasionnellement besoin d\u2019une pr\u00e9cision \u00e9lev\u00e9e de deux centim\u00e8tres, un appareil tel que <a href=\"https:\/\/emlid.com\/\">l\u2019Emlid Reach<\/a> est id\u00e9al. Un kit complet est d\u00e9j\u00e0 disponible \u00e0 partir d\u2019un peu plus de 700 euros. N\u2019h\u00e9sitez pas \u00e0 nous contacter si vous avez des questions \u00e0 ce sujet.      <\/p>\n<p>Il existe \u00e9galement des solutions pour lesquelles vous n\u2019avez pas besoin de canne GNSS, comme les Propeller Aeropoints mentionn\u00e9s pr\u00e9c\u00e9demment. Il s\u2019agit de points de calage au sol int\u00e9grant un r\u00e9cepteur GNSS. Tout ce que vous avez \u00e0 faire est de poser les points de calage au sol, de les allumer et de les laisser en place pendant au moins quarante-cinq minutes. Vous pouvez ensuite les r\u00e9cup\u00e9rer et envoyer les donn\u00e9es GNSS vers le cloud. Vous obtiendrez ainsi des coordonn\u00e9es pr\u00e9cises de vos points que vous pourrez facilement utiliser dans Pix4D.     <\/p>\n<p>Voil\u00e0 pour cette br\u00e8ve description de ce qu\u2019est un GCP. Pour toute question compl\u00e9mentaire, n\u2019h\u00e9sitez pas \u00e0 nous contacter et nous ferons de notre mieux pour vous aider dans les plus brefs d\u00e9lais.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1e3ecff e-flex e-con-boxed e-con e-parent\" data-id=\"1e3ecff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7a19d23 elementor-mobile-align-center elementor-widget elementor-widget-button\" data-id=\"7a19d23\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-shrink\" href=\"https:\/\/topo4d.be\/fr\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-caret-right\" viewBox=\"0 0 192 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M0 384.662V127.338c0-17.818 21.543-26.741 34.142-14.142l128.662 128.662c7.81 7.81 7.81 20.474 0 28.284L34.142 398.804C21.543 411.404 0 402.48 0 384.662z\"><\/path><\/svg>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contactez-nous ! <\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>GCP signifie Ground Control Point (point de calage au sol). Il est utilis\u00e9 comme point de r\u00e9f\u00e9rence et de contr\u00f4le pour un lev\u00e9 par drone. <\/p>\n","protected":false},"author":1,"featured_media":3706,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[58],"tags":[],"class_list":["post-3705","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Qu\u2019est-ce qu\u2019un GCP | Ground Control Point \u2013 TOPO4D<\/title>\n<meta name=\"description\" content=\"Qu\u2019est-ce qu\u2019un GCP (Ground Control Point) ? 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