In my QGIS python plugin I want to add a background map (if the user haven't added one), hence I think I missing something in the url for the Tiles/wms service.. (the function returns invalid layer) Any suggestions?

    sources = [layer.source() for layer in QgsProject.instance().mapLayers().values()]
    source_found = False
    for source in sources:
        if 'xyz&url' in source:
            source_found = True
    if not source_found:
        urlWithParams = 'type=xyz&url=http://a.tile.openstreetmap.org/%7Bz%7D/%7Bx%7D/%7By%7D.png&zmax=19&zmin=0&crs=EPSG3857'
        rlayer = QgsVectorLayer(urlWithParams, 'OpenStreetMap', 'wms')
        if rlayer.isValid():
            print('invalid layer')
  • 1
    What version of QGIS, are you using ? Aug 11, 2018 at 7:39
  • QGIS3.. (I know how to add it with XYZ Tiles manually)
    – axel_ande
    Aug 11, 2018 at 14:01
  • python to load xyz tiles raw.githubusercontent.com/klakar/QGIS_resources/master/… > sources.append(["connections-xyz","OpenStreetMap Standard"
    – Mapperz
    Aug 15, 2018 at 4:32
  • I know, it is a very nice script how to add the tiles to the browser, hence I would like to add it as a layer.
    – axel_ande
    Aug 15, 2018 at 7:48

1 Answer 1


Tiles/WMS sources give you raster data. So, you have to use QgsRasterLayer() instead of QgsVectorLayer().

Try in this way:

    rlayer = QgsRasterLayer(urlWithParams, 'OpenStreetMap', 'wms') # EDIT THIS LINE

    if rlayer.isValid():
        print('invalid layer')
  • I knew it was an easy fix! Thx
    – axel_ande
    Aug 21, 2018 at 8:57

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