But, as the whole area covers two districts ("Urfahr-Umgebung" and "Linz") who have to the whole work a second time to get the exact area of the TÜPL which is part of the district of Linz (the explanation above was just for the area which is part of the Urfahr-Umgebung district). 

Then you will also get the official data and border for the TÜPL area which is in the administrative region of Linz and you can merge it with the part of the administrative of Urfahr-Umgebung. 

Here is the screenshot from the area in the administrative district of Linz: https://i.ibb.co/T14t0kR/Bildschirmfoto-2021-02-13-um-11-25-14.png

You can see in this screenshot also another "TÜPL" circle from the Urfahr-Umgebung part which i explained in my comments above.