{"id":2219,"date":"2022-10-25T15:26:10","date_gmt":"2022-10-25T13:26:10","guid":{"rendered":"https:\/\/atlas-guinee-conakry.teledetection.fr\/?page_id=2219"},"modified":"2023-02-23T11:43:34","modified_gmt":"2023-02-23T10:43:34","slug":"cartographie-de-loccupation-des-sols","status":"publish","type":"page","link":"https:\/\/zaeg.teledetection.fr\/?page_id=2219","title":{"rendered":"Cartographie de l\u2019Occupation des Sols"},"content":{"rendered":"<div data-colibri-id=\"2219-c1\" class=\"style-1744 style-local-2219-c1 position-relative\">\n  <!---->\n  <div data-colibri-component=\"section\" data-colibri-id=\"2219-c2\" id=\"custom\" class=\"h-section h-section-global-spacing d-flex align-items-lg-center align-items-md-center align-items-center style-1755 style-local-2219-c2 position-relative\">\n    <!---->\n    <!---->\n    <div class=\"h-section-grid-container h-section-boxed-container\">\n      <!---->\n      <div data-colibri-id=\"2219-c3\" class=\"h-row-container gutters-row-lg-2 gutters-row-md-2 gutters-row-0 gutters-row-v-lg-2 gutters-row-v-md-2 gutters-row-v-2 style-1759 style-local-2219-c3 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-2 gutters-col-md-2 gutters-col-0 gutters-col-v-lg-2 gutters-col-v-md-2 gutters-col-v-2\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-auto h-col-md-auto h-col-auto style-1760-outer style-local-2219-c4-outer\">\n            <div data-colibri-id=\"2219-c4\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-1760 style-local-2219-c4 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"2219-c5\" class=\"h-global-transition-all h-heading style-1762 style-local-2219-c5 position-relative h-element\">\n                  <!---->\n                  <div class=\"h-heading__outer style-1762 style-local-2219-c5\">\n                    <!---->\n                    <!---->\n                    <h2 class=\"\">Cartographie de l&rsquo;occupation des sols<\/h2>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n      <div data-colibri-id=\"2219-c6\" class=\"h-row-container gutters-row-lg-1 gutters-row-md-1 gutters-row-0 gutters-row-v-lg-1 gutters-row-v-md-1 gutters-row-v-1 style-1756 style-local-2219-c6 position-relative\">\n        <!---->\n        <div class=\"h-row justify-content-lg-center justify-content-md-center justify-content-center align-items-lg-stretch align-items-md-stretch align-items-stretch gutters-col-lg-1 gutters-col-md-1 gutters-col-0 gutters-col-v-lg-1 gutters-col-v-md-1 gutters-col-v-1\">\n          <!---->\n          <div class=\"h-column h-column-container d-flex h-col-lg-6 h-col-md-6 h-col-12 style-1757-outer style-local-2219-c7-outer\">\n            <div data-colibri-id=\"2219-c7\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-1757 style-local-2219-c7 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"2219-c8\" class=\"h-text h-text-component style-1771 style-local-2219-c8 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <p>La cartographie de l\u2019occupation des sols de Guin\u00e9e a \u00e9t\u00e9 r\u00e9alis\u00e9e \u00e0 3 dates dites \u201cpivot\u201d: 2005, 2015 et 2020. La production des cartes de r\u00e9f\u00e9rence des trois pivots est issue d\u2019une classification semi-automatique supervis\u00e9e d\u2019images\n                      satellites \u00e0 haute r\u00e9solution spatiale. Pour le pivot 2015 une couverture d\u2019images SPOT 6\/7 2015 \u00b11an, \u00e0 6 m de r\u00e9solution spatiale et ortho-rectifi\u00e9e sur l\u2019ensemble du territoire Guin\u00e9en a \u00e9t\u00e9 utilis\u00e9e (donn\u00e9es issues du projet\n                      OSFACO 2019). Pour 2005, une couverture d\u2019images SPOT4\/5 de l\u2019ann\u00e9e 2005\u00b11 an mise \u00e0 disposition par le programme Spot World Heritage (SWH) du CNES a pu \u00eatre exploit\u00e9e ; et pour 2020 le projet s\u2019est appuy\u00e9 sur des images Sentinel-2\n                      de 2020-2021.<\/p>\n                    <p>La classification semi-automatique supervis\u00e9e est une approche consistant \u00e0 d\u00e9finir au pr\u00e9alable des zones d\u2019entrainement, qui servent de base d\u2019apprentissage pour un algorithme de classification. Dans le cas pr\u00e9sent l\u2019algorithme Random\n                      Forest \u00bb a \u00e9t\u00e9 utilis\u00e9. L\u2019\u00e9tablissement des parcelles d\u2019entrainement n\u00e9cessite dans un premier temps d\u2019identifier les diff\u00e9rents paysages dominants \u00e0 l\u2019int\u00e9rieur desquels les op\u00e9rateurs d\u00e9terminent des r\u00e9gions d\u2019int\u00e9r\u00eat correspondant\n                      \u00e0 des classes d\u2019occupation du sol pr\u00e9d\u00e9termin\u00e9es.<\/p>\n                    <p>La nomenclature de l\u2019occupation des sols utilis\u00e9e et synth\u00e9tis\u00e9e dans le tableau est une classification hi\u00e9rarchique en 46 postes et 3 niveaux d\u2019agr\u00e9gation selon le mod\u00e8le de classification europ\u00e9en Corine Land Cover (Heymann &amp;\n                      al, 1994) adapt\u00e9 aux sp\u00e9cificit\u00e9s des paysages du territoire guin\u00e9en en suivant les exp\u00e9riences d\u2019adaptation pr\u00e9c\u00e9dentes en Afrique de l\u2019Ouest (Jaffrain, 2016).<\/p>\n                    <p>Elle d\u00e9crit les formations v\u00e9g\u00e9tales conventionnelles retrouv\u00e9es sur le continent Africain, d\u00e9finies dans la nomenclature de Yangambi (Aubreville. A, 1957) ; les grands types de cultures sp\u00e9cifiques \u00e0 la Guin\u00e9e (cultures de bas-fond,\n                      cultures de plaine de mangroves, cultures de plaine d\u2019eau douce, &#8230;) ; ainsi que les diff\u00e9rents types de territoires artificialis\u00e9s (mines, urbanisations, etc..).\n                      <br>\n                    <\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n          <div class=\"h-column h-column-container d-flex h-col-lg-6 h-col-md-6 h-col-12 style-1758-outer style-local-2219-c9-outer\">\n            <div data-colibri-id=\"2219-c9\" class=\"d-flex h-flex-basis h-column__inner h-px-lg-2 h-px-md-2 h-px-2 v-inner-lg-2 v-inner-md-2 v-inner-2 style-1758 style-local-2219-c9 position-relative\">\n              <!---->\n              <!---->\n              <div class=\"w-100 h-y-container h-column__content h-column__v-align flex-basis-100 align-self-lg-start align-self-md-start align-self-start\">\n                <!---->\n                <div data-colibri-id=\"2219-c10\" class=\"d-block style-1766 style-local-2219-c10 position-relative h-element\">\n                  <!---->\n                  <div class=\"h-image__frame-container-outer\">\n                    <div class=\"h-image__frame-container\">\n                      <!---->\n                      <!---->\n                      <img loading=\"lazy\" decoding=\"async\" width=\"1547\" height=\"1097\" src=\"https:\/\/zaeg.teledetection.fr\/wp-content\/uploads\/2023\/02\/Nomenclature.png\" class=\"wp-image-5202 style-1766-image style-local-2219-c10-image\" alt=\"\" srcset=\"https:\/\/zaeg.teledetection.fr\/wp-content\/uploads\/2023\/02\/Nomenclature.png 1547w, https:\/\/zaeg.teledetection.fr\/wp-content\/uploads\/2023\/02\/Nomenclature-300x213.png 300w, https:\/\/zaeg.teledetection.fr\/wp-content\/uploads\/2023\/02\/Nomenclature-1024x726.png 1024w, https:\/\/zaeg.teledetection.fr\/wp-content\/uploads\/2023\/02\/Nomenclature-768x545.png 768w, https:\/\/zaeg.teledetection.fr\/wp-content\/uploads\/2023\/02\/Nomenclature-1536x1089.png 1536w\" sizes=\"auto, (max-width: 1547px) 100vw, 1547px\" \/>\n                      <div class=\"h-image__frame h-hide-lg h-hide-md h-hide-sm style-1766-frameImage style-local-2219-c10-frameImage\"><\/div>\n                    <\/div>\n                    <div class=\"style-1766-caption style-local-2219-c10-caption\">\n                      Nomenclature de l&rsquo;occupation du sol selon Corrine Land Cover ; Sources : ING Fi \/ ANASA \/ CIRAD\n                    <\/div>\n                  <\/div>\n                <\/div>\n                <div data-colibri-id=\"2219-c11\" class=\"h-text h-text-component style-1774 style-local-2219-c11 position-relative h-element\">\n                  <!---->\n                  <!---->\n                  <div class=\"\">\n                    <p>Les zones d\u2019entrainement ont \u00e9t\u00e9 choisies dans une dizaine de zones pilotes repr\u00e9sentatives de la diversit\u00e9 des paysages, sur la base des compositions color\u00e9es RVB des 3 canaux, respectivement, proche Infra Rouge (PIR), rouge et vert\n                      des images satellites SPOT6\/7 de 2015. Le r\u00e9sultat de ce long processus de production cartographique semi-automatique est de trois Bases de Donn\u00e9es cartographiques de l\u2019occupation des sols, sous des formes vectorielles (polygones)\n                      et matricielles (cellules) d\u00e9crivant finement l\u2019occupation des sols \u00e0 trois dates diff\u00e9rentes dans une nomenclature unique permettant des comparaisons et des calculs de dynamiques d\u2019\u00e9volution sur une p\u00e9riode de 15 ans : 2005 \u2013 2020.<\/p>\n                  <\/div>\n                <\/div>\n              <\/div>\n            <\/div>\n          <\/div>\n        <\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Cartographie de l&rsquo;occupation des sols La cartographie de l\u2019occupation des sols de Guin\u00e9e a \u00e9t\u00e9 r\u00e9alis\u00e9e \u00e0 3 dates dites \u201cpivot\u201d: 2005, 2015 et 2020. La production des cartes de r\u00e9f\u00e9rence des trois pivots est issue d\u2019une classification semi-automatique supervis\u00e9e d\u2019images satellites \u00e0 haute r\u00e9solution spatiale. Pour le pivot 2015 une couverture d\u2019images SPOT 6\/7 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-templates\/full-width-page.php","meta":{"footnotes":""},"class_list":["post-2219","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=\/wp\/v2\/pages\/2219","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2219"}],"version-history":[{"count":6,"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=\/wp\/v2\/pages\/2219\/revisions"}],"predecessor-version":[{"id":5229,"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=\/wp\/v2\/pages\/2219\/revisions\/5229"}],"wp:attachment":[{"href":"https:\/\/zaeg.teledetection.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2219"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}