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  1. #1

    Date d'inscription
    juin 2008
    Localisation
    Lausanne, Suisse
    Emploi
    Géographe aménagiste du territoire
    Âge
    29
    Messages
    67

    Par défaut Non Résolu : [QGIS 1.x] Système de projection d'un shp

    Bonjour,

    Je vais essayer au mieux de décrire mon problème mais, ce faisant, je me rend compte que c'est difficile d'être clair et le lecteur risque d'être un peu perdu. Mais je fais de mon mieux...

    J'ai créé une couche polyline sur ArcMap. Je l'ouvre maintenant sur QGIS afin de l'exporter en kml via le plugin convertisseur de couche OGR. J'effectue la conversion et ouvre mon kml dans GoogleEarth, mais mes lignes s'affichent sous la forme de lignes rouges sur l'équateur. Je fais quelques tests trouve que le problème semble venir des coordonnées des points constituant la ligne, donc probablement du système de projection.

    Code:
    <?xml version="1.0" encoding="utf-8" ?>
    <kml xmlns="http://earth.google.com/kml/2.0">
    <Document><Folder><name>parcours</name>
      
      <Placemark>
          <name>1</name>
          <description>Sarine - Gstaad Rossinière</description>
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      <Style><LineStyle><color>ff0000ff</color></LineStyle>  <PolyStyle><fill>0</fill></PolyStyle></Style>
      </Placemark>
    </Folder></Document></kml>
    Je retourne donc sur QGIS pour tenter de modifier le système de projection. Je galère un peu à faire varier les éléments dans lesquels on peut modifier les systèmes de projection (propriétés de la couche, "export to new projection" de "data management tools" du plugin "tools", propriétés du projet), sans succès... mais avec l'impression d'avoir le problème suivant : les coordonnées de mes lignes sont dans le système de projection suisse CHLV03 mais QGIS croit que c'est du WGS84 : Les propriétés de la couche indiquent que c'est du WGS84, mais les coordonnées affichées lorsque je pointe sur mes lignes sont bien les coordonnées suisses (de CHLV03).

    Donc à priori la solution que je verrais serait d'abord non pas de le convertir mais de lui dire "les coordonnées de points que tu as sont du CHLV03 et pas du WGS84" pour après le convertir en WGS84.

    Qu'en pensez-vous?


    P.S. : je sais que ça pourrait être plus simple de convertir mon shp en kml directement sous ArcMap avec le plugin "export to kml" ; mais j'ai ArcMap seulement à l'uni et sans les droits d'administrateur, apparemment nécessaires pour installer ce plugin. Donc je n'ai pas ce plugin à disposition.
    Dernière modification par Grégoire ; 21/01/2010 à 13h35.

  2. #2
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    Citation Envoyé par Grégoire Voir le message
    Donc à priori la solution que je verrais serait d'abord non pas de le convertir mais de lui dire "les coordonnées de points que tu as sont du CHLV03 et pas du WGS84" pour après le convertir en WGS84.

    Qu'en pensez-vous?
    Oui ça semble assez logique, mais la question qui reste en suspend c'est as tu essayé de le faire ? page 37 http://download.osgeo.org/qgis/doc/m...r_guide_fr.pdf
    changement de scr
    "comme j' dis toujours C'est pas parce que c'est sérieux que ça doit être lugubre..." Phyto
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    C'est effectivement ça. J'avais essayé, mais en fait le truc c'est qu'à chaque fois fait un changement de SCR il recalcule les coordonnées. Donc si on lui indique deux fois de suite un même système de projection, la deuxième fois il calculera en fonction du premier résultat et non des données de base, au lieu de savoir que l'opération précédente l'a déjà mis dans ce système. Donc il faut un peu jouer avec une combinaison de deux projections pour arriver au résultat voulu... hem bravo à ceux qui ont suivi

    Merci Lud pour ton aide

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    Je n'ai pas compris ce que tu as dit
    Ce que je t'ai proposé permet d'assigner une projection afin que ta couche initiale en possède une et qu'elle soit connue par qgis. Tu peux lui assigner une mauvaise si tu lui réassigne la bonne tes entités reviendront au bon endroit, lorsque tu fais cette manip tu ne touches pas aux coordonnées de ta couche.

    Mais si tu es arrivé au bon résultat c'est déjà ça, content de t'avoir aidé.
    "comme j' dis toujours C'est pas parce que c'est sérieux que ça doit être lugubre..." Phyto
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