{"id":3650,"date":"2020-04-04T13:34:35","date_gmt":"2020-04-04T11:34:35","guid":{"rendered":"https:\/\/topo4d.be\/apprendre-a-comprendre-lexactitude\/"},"modified":"2026-07-17T10:05:02","modified_gmt":"2026-07-17T08:05:02","slug":"apprendre-a-comprendre-lexactitude","status":"publish","type":"post","link":"https:\/\/topo4d.be\/fr\/apprendre-a-comprendre-lexactitude\/","title":{"rendered":"Apprendre \u00e0 comprendre l\u2019exactitude"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3650\" class=\"elementor elementor-3650 elementor-1638\" 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\">Apprendre \u00e0 comprendre l\u2019exactitude<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9e75773 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"9e75773\" 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=\"550\" height=\"638\" src=\"https:\/\/topo4d.be\/wp-content\/uploads\/2020\/04\/fig-1-ues.avif\" class=\"attachment-large size-large wp-image-3651\" alt=\"\" srcset=\"https:\/\/topo4d.be\/wp-content\/uploads\/2020\/04\/fig-1-ues.avif 550w, https:\/\/topo4d.be\/wp-content\/uploads\/2020\/04\/fig-1-ues-259x300.avif 259w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/>\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\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-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 class=\"vc_row wpb_row vc_row-fluid vc_custom_1544456219702 mkdf-row-light-btt-skin\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"wpb_text_column wpb_content_element \"><div class=\"wpb_wrapper\"><p>Comprendre l\u2019exactitude semble parfois complexe. Dans les mesures GNSS, par exemple, il existe toujours un petit \u00e9cart. D\u00e8s lors, comment savoir si le lev\u00e9 est exact, et s\u2019il s\u2019agit d\u2019une exactitude relative ou absolue ? Quand l\u2019une ou l\u2019autre s\u2019applique-t-elle ? Dans cet article, nous vous l\u2019expliquons bri\u00e8vement.    <\/p><h2><strong>Pourquoi il est important de comprendre l\u2019exactitude. <\/strong><\/h2><p>Les termes couramment utilis\u00e9s et essentiels pour la plupart des instruments topographiques sont l\u2019exactitude relative, l\u2019exactitude absolue et la pr\u00e9cision. Ce blog a pour but de souligner l\u2019importance de l\u2019exactitude. En termes simples, si vous comprenez l\u2019exactitude et les facteurs qui l\u2019influencent, vous pourrez obtenir les meilleurs r\u00e9sultats lors de vos lev\u00e9s.  <\/p><h2><strong>Travailler du g\u00e9n\u00e9ral au particulier<\/strong><\/h2><p>Une question souvent pos\u00e9e aux g\u00e9om\u00e8tres est : qu\u2019est-ce que l\u2019arpentage et que faites-vous exactement ? Et je vais \u00eatre honn\u00eate, c\u2019est une question difficile ! En tant que passionn\u00e9 de g\u00e9omatique, j\u2019ai envie de tout leur dire sur le GNSS, les g\u00e9o\u00efdes, les syst\u00e8mes de coordonn\u00e9es, la technologie et la mani\u00e8re dont nous aidons les clients \u00e0 r\u00e9soudre des probl\u00e8mes gr\u00e2ce \u00e0 l\u2019utilisation de donn\u00e9es pr\u00e9cises.  <\/p><p>L\u2019arpentage est \u00e0 la fois la science de la mesure exacte et de la collecte de donn\u00e9es spatiales, et l\u2019art de transformer ces informations en un r\u00e9sultat final qualitatif afin de servir au mieux le client. En tant que g\u00e9om\u00e8tres, nous sommes form\u00e9s \u00e0 de nombreuses disciplines, mais le plus important est de comprendre l\u2019exactitude, la pr\u00e9cision et l\u2019ex\u00e9cution de mesures de haute qualit\u00e9. Comme tout bon g\u00e9om\u00e8tre, j\u2019aborderai ce sujet de la mani\u00e8re la plus rigoureuse possible. Dans notre jargon, cela signifie mettre en place un syst\u00e8me robuste avec un contr\u00f4le rigoureux, afin de garantir que les mesures soient effectu\u00e9es avec une grande exactitude.   <\/p><h2><strong>Quelle est la diff\u00e9rence entre l\u2019exactitude et la pr\u00e9cision ?<\/strong><\/h2><p>L\u2019exactitude et la pr\u00e9cision sont deux mani\u00e8res pour les g\u00e9om\u00e8tres d\u2019appr\u00e9hender les \u00ab erreurs \u00bb.<\/p><p><strong>Exactitude :<\/strong> L\u2019exactitude fait r\u00e9f\u00e9rence \u00e0 la proximit\u00e9 d\u2019une mesure par rapport \u00e0 la valeur r\u00e9elle.<br\/><strong>Pr\u00e9cision :<\/strong> La pr\u00e9cision correspond \u00e0 la proximit\u00e9 entre plusieurs mesures successives.<\/p><h2><strong>Exemple : Tirer sur une cible<\/strong><\/h2><p>Une mani\u00e8re classique d\u2019illustrer la diff\u00e9rence entre pr\u00e9cision et exactitude est d\u2019utiliser une cible. Le processus de mesure est le \u00ab tir sur la cible \u00bb. La \u00ab mesure \u00bb est l\u2019endroit o\u00f9 la balle atteint la cible. La valeur \u00ab r\u00e9elle \u00bb est le centre de la cible.   <\/p><p><strong>Pr\u00e9cision :<\/strong> si toutes les balles se regroupent tr\u00e8s pr\u00e8s les unes des autres, mais loin du centre, il y a de la pr\u00e9cision, mais pas d\u2019exactitude.<br><strong>Exactitude :<\/strong> si les balles sont \u00e0 peu pr\u00e8s \u00e0 \u00e9gale distance les unes des autres et \u00e0 \u00e9gale distance du centre, il y a une exactitude math\u00e9matique car la moyenne des impacts se situe au centre. Cela repr\u00e9sente des donn\u00e9es exactes, mais pas pr\u00e9cises. Cependant, si vous tiriez r\u00e9ellement, cela ne compterait pas comme un coup dans le mille !  <br><strong>Exact et pr\u00e9cis :<\/strong> si les balles atteignent le centre et sont proches les unes des autres, il y a \u00e0 la fois de l\u2019exactitude et de la pr\u00e9cision.<\/p><p><strong>Toutes les exactitudes ne se valent pas : l\u2019exactitude peut \u00eatre associ\u00e9e au positionnement relatif et absolu<\/strong><\/p><p>Il existe quelques autres termes importants pour comprendre l\u2019exactitude du positionnement. Ce sont : <\/p><ul><li>Positionnement relatif : le positionnement relatif est celui o\u00f9 la position d\u2019un objet est connue par rapport \u00e0 d\u2019autres objets.<\/li><li>Positionnement absolu : le positionnement absolu correspond \u00e0 l\u2019endroit o\u00f9 un objet se situe dans le monde r\u00e9el.<\/li><li>R\u00e9p\u00e9table : un m\u00eame g\u00e9om\u00e8tre peut-il obtenir syst\u00e9matiquement les m\u00eames r\u00e9sultats avec un seul instrument ?<\/li><li>Reproductible : plusieurs g\u00e9om\u00e8tres, \u00e9ventuellement avec plusieurs instruments, peuvent-ils obtenir syst\u00e9matiquement les m\u00eames r\u00e9sultats ?<\/li><\/ul><p>Ces conditions sont importantes lors du choix de la meilleure m\u00e9thode de mesure pour l\u2019ex\u00e9cution de votre mission. Positionnez-vous votre mod\u00e8le par rapport \u00e0 d\u2019autres objets et avec quelle exactitude le positionnez-vous par rapport \u00e0 ces objets ? Ou positionnez-vous votre mod\u00e8le avec exactitude dans le monde r\u00e9el ? Vos r\u00e9sultats sont-ils r\u00e9p\u00e9tables et reproductibles ?   <\/p><blockquote><p><strong>Gr\u00e2ce \u00e0 nos m\u00e9thodes de mesure, nous int\u00e9grons des technologies et des connaissances qui vous permettent d\u2019avoir confiance en vos donn\u00e9es et en leur placement dans le monde r\u00e9el \u2013 de mani\u00e8re coh\u00e9rente gr\u00e2ce \u00e0 un positionnement qui vous permet d\u2019obtenir la meilleure exactitude absolue lors du lev\u00e9 de votre mission.<\/strong><\/p><\/blockquote><\/div><\/div><\/div><\/div><\/div><\/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>Comprendre l\u2019exactitude semble parfois complexe. Dans les mesures GNSS, par exemple, il existe toujours un petit \u00e9cart. D\u00e8s lors, comment savoir si le lev\u00e9 est exact, et s\u2019il s\u2019agit d\u2019une exactitude relative ou absolue ? Quand l\u2019une ou l\u2019autre s\u2019applique-t-elle ? Dans cet article, nous vous l\u2019expliquons bri\u00e8vement.    <\/p>\n","protected":false},"author":1,"featured_media":3651,"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-3650","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>Apprendre \u00e0 comprendre l\u2019exactitude | TOPO4D<\/title>\n<meta name=\"description\" content=\"Qu\u2019est-ce que l\u2019exactitude et comment la comprendre lors des mesures ? 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