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<p style="text-align: left;">Au cours de la session 4, vous avez créé un notebook pour charger les produits satellitaires, rééchantillonner les données en segments trimestriels, puis calculer et tracer l'indice de végétation par différence normalisée (NDVI). La combinaison de bandes dans des indices tels que le NDVI peut fournir des informations importantes sur les données qui pourraient ne pas être apparentes en utilisant uniquement l'imagerie RVB en couleurs vraies. </p>
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<h3 style="text-align: left;">Complétez le quiz</h3>
<p style="text-align: left;">Cette section contient le quiz de session. Tous les quiz, sondages et contrôles de connaissances comptent pour votre progression pour un certificat de cours.</p>
<h3>Vérifiez votre notebook</h3>
<p style="text-align: left;">Le quiz vous demandera d'utiliser le cahier que vous avez développé pour l'exercice de cette session sur le chargement des données. Si vous souhaitez confirmer que votre notebook fonctionne comme prévu, vous pouvez le comparer à l'exemple de notebooks de solution.</p>
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<p class="admonition-title" style="box-sizing: border-box; line-height: 1; margin: -12px -12px 12px; font-size: inherit; font-family: inherit; font-variant-numeric: normal; font-variant-east-asian: normal; font-weight: bold; font-stretch: normal; text-rendering: auto; -webkit-font-smoothing: antialiased; color: #ffffff; background: #6ab0de; padding: 6px 12px; text-align: left;">Note</p>
<p style="box-sizing: border-box; line-height: 24px; margin: 0px; font-size: 16px; text-align: left;">L'exemple de bloc-notes de solutions ne contient pas la réponse au quiz. Utilisez-le pour vérifier que vous avez bien fait l'exercice, puis utilisez votre cahier d'exercices pour répondre au quiz. L'accès au bloc-notes de solution n'affectera pas votre progression vers le certificat.</p>
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<p style="text-align: left;">Vous pouvez utiliser le notebook que vous avez développé dans le cadre de cette session. Dans ce quiz, nous allons changer le domaine d'intérêt.</p>
<p style="text-align: left;">Modifiez la commande <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">load_ard()</span></code> our sélectionner la zone :</p>
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<div class="highlight" style="box-sizing: border-box; background: #f8f8f8; border: none; overflow-x: auto; margin: 0px; padding: 0px; text-align: left;">
<pre style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: pre; line-height: 1.4; margin-top: 0px; margin-bottom: 0px; padding: 12px; overflow: auto; color: #000000;">x = (-5.7295, -5.7485)<br />y = (34.3971, 34.4131)</pre>
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<p style="text-align: left;">Conservez tous les autres paramètres conformément à la commande <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">load_ard()</span></code> "Calculer le NDVI: Partie 2". Le chargement prendra environ 4 minutes.</p>
<p style="text-align: left;"><strong>Astuce:</strong> Le champ <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">measurements</span></code> doit inclure <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">'nir'</span></code> et il ne doit pas y avoir d'entrée <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">'min_gooddata</span></code> .</p>
<p style="text-align: left;">Utilisez les fonctions <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">resample</span></code> et <code class="docutils literal notranslate" style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: nowrap; max-width: 100%; background-image: initial; background-color: #ffffff; border: 1px solid #e1e4e5; padding: 2px 5px; color: #e74c3c; overflow-x: auto;"><span class="pre" style="box-sizing: border-box;">map</span></code> comme indiqué dans "Calculer le NDVI: Partie 2"pour calculer une géomédiane triennale. Ensuite, exécutez le calcul NDVI. Vous devriez déjà avoir ce code dans le notebook :</p>
<div class="highlight-none notranslate" style="box-sizing: border-box; border: 1px solid #e1e4e5; overflow-x: auto; margin: 1px 0px 24px; text-align: left;">
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<pre style="box-sizing: border-box; font-family: SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', Courier, monospace; font-size: 12px; white-space: pre; line-height: 1.4; margin-top: 0px; margin-bottom: 0px; padding: 12px; overflow: auto; color: #000000;">nir = geomedian_resample.nir<br />red = geomedian_resample.red<br />NDVI = (nir - red) / (nir + red)</pre>
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<p style="box-sizing: border-box; line-height: 24px; margin: 0px; font-size: 16px; text-align: left;">Nous vous encourageons fortement à essayer l'exercice plus tôt dans la session de la page précédente avant de télécharger la solution ci-dessous. Cela vous aidera à apprendre à utiliser la Sandbox indépendamment pour vos propres analyses.</p>
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<p style="box-sizing: border-box; line-height: 24px; margin: 0px 0px 24px; font-size: 16px; color: #000000; text-align: left;"><a class="reference external" href="/assets/courseware/v1/cea7f4eb6997069ca16799ff7d800ca3/asset-v1:digitalearthafrica+DEA101-fr+2021+type@asset+block/Calculate_NDVI_Part_1_solution-annotated.ipynb" style="box-sizing: border-box; color: #3091d1; text-decoration-line: none; cursor: pointer; outline: 0px;" target="[object Object]">Téléchargez le notebook de solutions pour l'exercice de la session 4 partie 1</a></p>
<p style="box-sizing: border-box; line-height: 24px; margin: 0px 0px 24px; font-size: 16px; color: #000000; text-align: left;"><a class="reference external" href="/assets/courseware/v1/480f2cf83c7fd33cfc855663cb01e88c/asset-v1:digitalearthafrica+DEA101-fr+2021+type@asset+block/Calculate_NDVI_Part_2_solution-annotated.ipynb" style="box-sizing: border-box; color: #2980b9; text-decoration-line: none; cursor: pointer;" target="[object Object]">Téléchargez le notebook de solutions pour l'exercice de la session 4 partie 2</a></p>
<p style="text-align: left;"><span class="VIiyi" lang="fr"><span class="JLqJ4b ChMk0b" data-language-for-alternatives="fr" data-language-to-translate-into="en" data-phrase-index="0"><span>Pour afficher ce bloc-notes sur la Sandbox, vous devez d'abord le télécharger sur votre ordinateur, puis le télécharger dans la Sandbox.</span></span> <span class="JLqJ4b ChMk0b" data-language-for-alternatives="fr" data-language-to-translate-into="en" data-phrase-index="1"><span>Suivez ces instructions:</span></span></span></p>
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<li style="box-sizing: border-box; list-style: decimal; margin-left: 24px;">Téléchargez le notebook en cliquant sur le lien ci-dessus. .</li>
<li style="box-sizing: border-box; list-style: decimal; margin-left: 24px;">Dans la Sandbox, ouvrez le dossier <strong>Training</strong></li>
<li style="box-sizing: border-box; list-style: decimal; margin-left: 24px;"><span class="VIiyi" lang="fr"><span class="JLqJ4b ChMk0b" data-language-for-alternatives="fr" data-language-to-translate-into="en" data-phrase-index="0"><span>Cliquez sur le bouton <strong>Télécharger des fichiers</strong> comme indiqué ci-dessous</span></span></span></li>
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<li style="box-sizing: border-box; list-style: decimal; margin-left: 24px; text-align: left;">Sélectionnez le bloc-notes téléchargé à l'aide du navigateur de fichiers. Cliquez sur <strong>OK</strong></li>
<li style="box-sizing: border-box; list-style: decimal; margin-left: 24px; text-align: left;">Le notebook de la solution apparaîtra dans le dossier <strong>Training</strong>. Double-cliquez pour l'ouvrir.</li>
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