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Le Service public de Wallonie (SPW) produit périodiquement des vues aériennes du territoire wallon sous forme d’orthophotos. Les orthophotos sont accompagnées de deux couches de données, à savoir :

Le maillage
----------------
Le maillage des orthophotos 2021 est un découpage, sous forme de polygones, de la Wallonie en mailles carrées de 2 km x 2 km de côté ayant comme origine la coordonnée (0,0). Il est propre au Service public de Wallonie. Des données attributaires telles que les dates de vol sur la maille (première et dernière), les caractéristiques de l'image (largeur, hauteur, canaux, date, etc.), le fournisseur, etc. sont associées à chaque maille du maillage. 

Les orthophotos sont disponibles, entre autres, sous forme d’images (au format Geotiff, pour les plus récentes) de la dimension d’une maille.

L’ensemble des fichiers images appartenant à une feuille IGN au 1/50.000 est groupé dans un même dossier portant le numéro de la feuille.

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Le tuilage
----------------
Le tuilage est un ensemble de tuiles polygonales délimitées par des lignes de raccord (également appelées lignes de suture ou "seamlines" en anglais). Une tuile délimite la partie d'une photo (unique) retenue dans le processus d'orthorectification et de mosaïquage. Des données attributaires telles que la date de prise de vue, l'angle solaire, l'ouverture, le nombre de points de contrôle, le nom du fichier de prise de vue ayant servi à l'orthorectification, etc. sont associées à chaque tuile.</gco:CharacterString>
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