Dear all, thanks a lot. Yes is it true: I need to copy the content of one layer into the other, so I need Merge. Anyway thanks for the useful advices also regarding the union.
bye bye Azzurra 2015-12-21 14:45 GMT+01:00 Andreas Neumann <[email protected]>: > Hi Matthias, > > Thanks for this useful hint. > > But this "union" is also just a concatenating - it is in the sense of a > union of SQL result sets. It does not create new geometries, as a geometric > union would do. > > So the question remains: what type of "union" does Azzurra want? a > concatenation of several data sets or a geometric union where new > geometries of overlapping features are generated? > > Andreas > > > On 21.12.2015 14:10, Matthias Kuhn wrote: > >> 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 >>> >> > _______________________________________________ > 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 > -- 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*
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