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Plugin installed incorrectly. Rename plugin directory 'backlinks.old' to 'backlinks'.
−Table des matières
Calculs : Surfaces
Question
Quelle est la différence entre “Area”, “CartesianArea” et “SphericalArea” pour le calcul de surface dans MI ?
Réponse
Area et “SphericalArea” sont des commandes qui calculent les surfaces en coordonnées sphériques, donc non projetées.
Si les données sont en non terrestres avec longitude et latitude(comme sur un globe), ce sont les commandes qu'il faut utiliser.
Par contre, si les coordonnées correspondent à une projection sur un plan (repère cartésien, donc), il faut utiliser la commande “CartesianArea”.
Ces différences découlent tout simplement des formules de calcul de distance qui sont différentes selon le repère utilisé.
- Area() utilisera les réglages par défaut: ceux définis dans les Préférences → Fenêtre carte, ou ceux de MI (Cartésien si on est en Non-Terrestre ou Sphérique sinon)
- CartesianArea() utilise un algorithme cartésien (!) pour calculer la surface “plate” projetée (ne marche pas si on est en Longitude-Latitude)
- SphericalArea() tient compte de la rotondité de la Terre (surface calculée en Longitude-Latitude en utilisant un algorithme basé sur le grand cercle)
Pour aller plus loin
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