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Processing: reprojection
project = QgsProject.instance() mylayer = QgsProject.instance().mapLayersByName("decathlon_france")[0] mylayer4326 = 'C:/Users/georg/Downloads/decathlon_france4326.shp' processing.run("native:reprojectlayer", { 'INPUT':mylayer, 'TARGET_CRS':QgsCoordinateReferenceSystem('EPSG:4326'), 'CONVERT_CURVED_GEOMETRIES':False, 'OPERATION':'+proj=pipeline +step +inv +proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +step +proj=unitconvert +xy_in=rad +xy_out=deg', 'OUTPUT':mylayer4326 }) project.addMapLayer(mylayer) project.removeAllMapLayers() mylayerOpen = QgsVectorLayer(mylayer4326, 'decathlon_france', 'ogr') project.addMapLayer(mylayerOpen)