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Annonce

Printemps des cartes 2024

#1 Wed 27 June 2018 07:47

Nausicaa26
Juste Inscrit !
Date d'inscription: 25 Jun 2018
Messages: 1

QGIS 3.2: outil enveloppe convexe

Bonjour tout le monde!

J'ai un petit soucis avec la fonction enveloppe convexe (menu vecteur, onglet outils de géotraitement, enveloppe convexe)
Je dispose de nombreux points GPS, correspondant aux suivi de plusieurs individus au cours du temps; ainsi que d'une couche de polygones m'informant sur l'assolement. Je souhaiterais pour chaque individu, pour chaque mois, calculer l'aire de son domaine vital et la composition de celui-ci (% de chaque culture (blé, betterave,...) dans le domaine vital).
Mon problème est que lorsque je lance la fonction "enveloppe convexe", l'algorithme s'exécute, la couche de sortie se charge et s'affiche dans l'encadré de gauche où se trouve la liste des couches, seulement elle n'apparait pas sur l'écran (elle n'est pas cacchée sous une autre couche, j'ai vérifié). De plus, lors de l'exécution de l'algorithme des lignes s'affichent en rouge donc je suppose qu'il y a un problème wink

L'algorithme affiche ceci: "
Processing algorithm…
AlgorithmDialog
Paramètres en entrée:
{ 'INPUT' : 'C:UsersNinonLievres2018_travailCartographiePoints GPSLievres_shpid_40001_Ewilan.shp', 'OUTPUT' : 'memory:' }

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Execution completed in 0.38 seconds
Résultats:
{'OUTPUT': 'output_e5d21278_fbc1_4b8b_8951_c9af073ae12a'}

Chargement des couches de résultat
Algorithme 'Enveloppe convexe' terminé
Processing algorithm…
AlgorithmDialog
Paramètres en entrée:
{ 'INPUT' : 'C:UsersNinonLievres2018_travailCartographiePoints GPSLievres_shpid_40001_Ewilan.shp', 'OUTPUT' : 'memory:' }

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Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
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Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
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Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
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Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
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Feature could not be written to output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef
Execution completed in 0.34 seconds
Résultats:
{'OUTPUT': 'output_e3c8f4fc_ed54_44e7_a73b_638a71e142ef'}

Chargement des couches de résultat
Algorithme 'Enveloppe convexe' terminé"

Par ailleurs, la table d'attributs de la couche de sortie est vide.

J'ai cherché sur les forums mais n'est rien trouvé à ce sujet
Je suis sous la version 3.2 de QGIS

Merci!! smile

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#2 Wed 27 June 2018 11:15

SANTANNA
Moderateur
Lieu: Angers
Date d'inscription: 18 Jan 2008
Messages: 3807

Re: QGIS 3.2: outil enveloppe convexe

Bonjour,
Ce genre de message sort lorsque l'objet créé n'est pas compatible avec le type de géométrie de la couche de sortie. En y regardant de près, je pense que ce n'est pas le bon algorithme que vous utilisez: rejetez un coup d’œil à l'aide de la fonction utilisée: elle calcule une enveloppe pour chaque entité (ici donc, une enveloppe pour un point). Utilisez plutôt l'algorithme "Géométrie d'emprise minimale".

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