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    <Title><![CDATA[2020- L&apos;empreinte des perturbations anthropiques sur les aires de répartition du caribou boréal au Canada – Telle qu&apos;interprétée à partir d&apos;imagerie satellitaire Landsat de 2020 ]]></Title>
    <Abstract><![CDATA[Dans le cadre d&apos;une évaluation scientifique de l&apos;habitat essentiel du caribou des bois boréal (Environnement Canada 2011, se reporter à la référence complète dans la documentation d’accompagnement), la division de la science et de la technologie du paysage d&apos;Environnement et Changement climatique Canada avait pour tâche de fournir une cartographie détaillée des perturbations anthropiques, à partir de 2010, à travers les aires de répartition connues du caribou. L’ensemble de données ci-joint constituent la deuxième mise à jour quinquennale (la première en 2015) qui porte les données jusqu’en 2020. La cartographie initiale des perturbations était basée sur des images Landsat-5 d&apos;une résolution spatiale de 30 mètres, prises entre 2008 et 2010. Depuis, les perturbations anthropiques dans 51 aires de répartition du caribou au Canada ont été recartographiées tous les cinq ans afin de créer un ensemble de données géospatiales cohérent, fiable et reproductible à l&apos;échelle nationale, en suivant une méthodologie commune. Ces aires de répartition étaient délimitées par province et territoire dans l’ensemble du pays. Les méthodes développées étaient axées sur la cartographie des perturbations à un moment donné et ne visaient pas à déterminer l’âge des perturbations, ce qui peut présenter un intérêt particulier pour les perturbations pouvant être considérées comme non permanentes, par exemple les aires de coupe. Les ensembles de données résultants ont été utilisés pour une fonction de sélection des ressources de caribou (modélisation de l’habitat) et pour évaluer les niveaux de perturbation globaux dans chaque aire de répartition du caribou. Comme pour le projet de cartographie de 2010, la perturbation anthropique a été définie comme toute perturbation d’origine humaine sur le paysage naturel et pouvant être identifiée visuellement à partir d’images Landsat multi bandes d’une résolution de 30 mètres à une échelle de visualisation de 1:50 000. Le même concept a été suivi pour la cartographie des perturbations en 2015 et 2020 et toute perturbation supplémentaire observée depuis la date de cartographie initiale a été ajoutée. La base de données de 2015 a servi de point de départ à la base de données de 2020. Contrairement à l&apos;itération précédente, les entités n&apos;ont pas été supprimées au cours du processus de cartographie, une décision prise au nom du temps. L&apos;interprétation a été réalisée sur la base des images sans nuages les plus récentes disponibles jusqu&apos;au milieu de l&apos;automne pour une année donnée. Chaque type d&apos;entité de perturbation était représenté dans la base de données par une ligne ou un polygone, en fonction de leur description géométrique. Les perturbations linéaires incluaient: les routes, les lignes électriques, les chemins de fer, les lignes d’exploration sismique, les pipelines, les barrages, les pistes d&apos;atterrissage, ainsi que des éléments inconnus. Les perturbations polygonales incluaient: des aires de coupe, des polygones de récolte (ajouté en 2020), des mines, des aires bâties, des sites de puits, des installations agricoles, des installations pétrolières et gazières, ainsi que des caractéristiques inconnues. Pour chaque type de perturbation anthropique, une description claire a été établie (voir l&apos;annexe 7.2 de l&apos;évaluation scientifique) afin de maintenir la cohérence dans l&apos;identification des diverses perturbations de l’imagerie par les différents interprètes. Les entités n’étaient numérisées que s’ils étaient visibles sur l’imagerie Landsat à l&apos;échelle d’affichage prescrit. Par rapport au protocole de cartographie précédent, l&apos;une des améliorations apportées au processus de cartographie en 2020 était l&apos;ajout des polygones de récolte du SCF (Réf: RNCan-SCF NTEMS ; Wulder 2020) dans la base de données avant l&apos;interprétation. Cela a considérablement réduit le temps de numérisation des polygones et accéléré le processus de recueil des données. Les polygones de récolte du SCF ont été vérifiés avant d&apos;être inclus, éliminant certains polygones générés par erreur dans leur processus. Une phase de contrôle de la qualité par un deuxième interprète a été réalisée afin de s&apos;assurer de la qualité, de l&apos;intégralité et de la cohérence des données recueillies. Ensuite, un tampon de 500m radial, représentant la zone d&apos;influence sur les populations de caribou boréal, a été ajouté aux données vectorielles. De plus, les polygones représentant les feux de forêt des quarante dernières années (BNDFFC1981-2020) ont été fusionnés à l&apos;empreinte anthropique tamponnée afin de créer une empreinte de perturbation totale. Ces ensembles de données tamponnées ont été utilisés pour calculer les niveaux de perturbation totale dans chaque aire de répartition et pour l&apos;analyse de l&apos;évaluation intégrée des risques.]]></Abstract>
    <KeywordList><Keyword><![CDATA[cartographie, perturbation anthropique, forêt boréale, espèces en péril, caribou, habitat, couverture du sol, utilisation du sol, perturbation, empreinte de la perturbation]]></Keyword></KeywordList>
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        <Title><![CDATA[Aires de répartition du caribou boréal définies par RS Fédéral 2012]]></Title>
        <Abstract><![CDATA[Il y a 51 aires de répartition du caribou boréal qui ont été définies par les provinces et territoires individuels à travers le Canada.  Les limites des aires de répartition utilisées dans la cartographie 2008-2010 (RS fédéral 2012) ont été maintenues pour l'analyse 2015 et 2020.]]></Abstract>
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          <Title><![CDATA[Perturbations anthropiques tamponnées fusionnées aux incendies (40 ans)]]></Title>
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        <Title><![CDATA[Perturbations anthropiques 2020 tamponnées par 500 m]]></Title>
        <Abstract><![CDATA[Perturbations linéaires et polygonales tamponnées sur 500 m, représentant leur zone d'impact étendue sur les troupeaux de caribous de la forêt boréale.]]></Abstract>
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          <Title><![CDATA[Perturbations anthropiques 2020 tamponnées par 500 m]]></Title>
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        <Title><![CDATA[Perturbations anthropiques polygonales 2020]]></Title>
        <Abstract><![CDATA[En fonction de leur description géométrique, les perturbations anthropiques (identifiées à partir d'images Landsat d'une résolution de 30 m à une échelle de visualisation de 1:50 000) sont représentées par une ou un polygone. Les perturbations polygonales comprennent : des aires de coupe, des mines, des aires bâties, des sites de puits, des installations agricoles, des installations pétrolières et gazières, ainsi que des caractéristiques inconnues. Sont incluses ici les perturbations polygonales i) identifiées en 2010 qui étaient également visibles en 2015 ii) identifiées comme nouvelles en 2015 iii) obtenues du SCF (polygones de récolte pour 2015- 2020) et ajoutées avant la numérisation et iv) identifiées comme nouvelles à partir de l’imagerie Landsat 2020.]]></Abstract>
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          <Title><![CDATA[Perturbations anthropiques polygonales 2020]]></Title>
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        <Title><![CDATA[Perturbations anthropiques linéaires 2020]]></Title>
        <Abstract><![CDATA[En fonction de leur description géométrique, les perturbations anthropiques (identifiées à partir d'images Landsat d'une résolution de 30 m à une échelle de visualisation de 1:50 000) sont représentées par une ligne ou un polygone. Les perturbations linéaires comprennent : les routes, les chemins de fer, les lignes électriques, les lignes d'exploration sismique, les pipelines, les barrages, les pistes d'atterrissage et les éléments inconnus. Sont incluses ici les perturbations linéaires i) identifiées en 2010 qui étaient également visibles en 2015 ii) identifiées comme nouvelles en 2015 iii) et identifiées comme nouvelles en 2020.]]></Abstract>
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