def addLayer(self, layerType):
layer = OpenlayersLayer(self.iface, self._olLayerTypeRegistry)
layer.setName(layerType.displayName)
layer.setLayerType(layerType)
if layer.isValid():
coordRefSys = layerType.coordRefSys(self.canvasCrs())
self.setMapCrs(coordRefSys)
QgsProject.instance().addMapLayer(layer)
# last added layer is new reference
self.setReferenceLayer(layer)
