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Pixel de 20cm.
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                        <gco:CharacterString>L'orthophotographie à 20cm est réalisée à partir de prises de vues à 20cm de résolution.
Le nombre de clichés nécessaires pour couvrir un département est de l'ordre de 600 à 1300. L'aspect radiométrique d'un département résulte donc d'un compromis sur l'ensemble des clichés nécessaires à sa couverture. La hauteur de soleil reste toujours supérieure à 30°. La qualité des images numérique est améliorée par les traitements radiométriques suivants:
- réduction des anomalies de contraste et de couleur liées à l'angle d'incidence des rayons solaires, aux conditions atmosphériques et à l'objectif photographique 
- égalisation radiométrique sur l'ensemble des images de chaque département 
- rehaussement global en couleur après orthorectification de chaque bloc.
Produit par Institut national de l'information géographique et forestière (IGN-F).</gco:CharacterString>
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