I have recently used OGR VRT for this: http://www.gdal.org/drv_vrt.html *OGRVRTUnionLayer*
If you are not afraid of editing an XML file, that would be an approach. Matthias On 12/21/2015 01:37 PM, Andreas Neumann wrote: > Hi, > > Isnt' merge something else than union? As far as I know, merge only > copies the content of one layer into the other, whereas union really > unites overlapping geometry and creates new features. You'd have to > define how it handles the attributes. > > Andreas > > On 21.12.2015 11:49, Lewis Villierme wrote: >> Hi, >> >> There's a tool called in vector/Data management/Merges Multiples >> layer to one >> >> you can specify a folder in which you have all your shapefile to merge. >> >> regards. >> >> 2015-12-21 10:04 GMT+00:00 Azzurra Lentini <[email protected]>: >>> Dear all, >>> is it possible in Qgis to do the union of more polygons of >>> differents layers >>> (so from more input layers to have one output layer as I can do in >>> arcgis)? >>> >>> In vector --> geoprocess --> union >>> is the union of only 2 different layers but is not possible a union >>> a more >>> of 2 layers. >>> >>> Thanks, Azzurra >>> >>> -- >>> Dr. Hydrogeologist >>> AZZURRA LENTINI >>> Expert of evaluation environmental hazards >>> GIS application >>> Haity Mobile Tel: 0050946057393 >>> ++++++++++++++++++++++++++ >>> Italy Mobile Tel.: **(39) 338 24 40 676 >>> ++++++++++++++++++++++++++ >>> SKYPE azzurrahydro >>> ++++++++++++++++++++++++++ >>> [email protected] >>> ++++++++++++++++++++++++++ >>> *Par respect pour l'environnement,* >>> >>> *n'imprimez ce mail qu'en cas d'absolue nécessité* >>> >>> >>> >>> >>> >>> >>> >>> _______________________________________________ >>> Qgis-user mailing list >>> [email protected] >>> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >>> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user >> _______________________________________________ >> Qgis-user mailing list >> [email protected] >> List info: http://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: http://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user -- Matthias Kuhn OPENGIS.ch - https://www.opengis.ch Spatial • (Q)GIS • PostGIS • Open Source _______________________________________________ Qgis-user mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
