Postal code areas only tangentially have something to do with the municipality (in this case Lausanne) and just in the simplest case they are the same.

Sub-divisions (PLZ6) of the PLZ4 areas are quite common either for practical reasons (same road name used more than once in the PLZ4 area, different canton etc) or for the equivalent of vanity licence plates, in any case the PLZ6 has a one to one mapping to a PLZ4 and a postal city.

Simple example Hurden in the canton Schwyz is in the Rapperswil (canton SG) PLZ4 8640 and is its own PLZ6 8640-03.

Addresses in Hurden in OSM should have

addr:city=Hurden

addr:postcode=8640

tags.

So back to your specific question.  At least in the past, just like in Zürich btw, Lausanne used different PLZ4 for different post code areas of the city, say 1004 Lausanne and 1007 Lausanne. I don't know when this changed but your example would indicate that they've stopped doing that and are now using PLZ6 plus an "invented" postal city name.

See https://map.geo.admin.ch/?time=None&lang=en&topic=ech&bgLayer=ch...

In any case systematically this "should" be mapped as

addr:city=Lausanne 26

addr:postcode=1000

which admittedly is a bit ugly and might cause issues with geocoding. This being OSM we could invent something to fix this, for example by using the PLZ6 in some format for addr:postcode (for example addr:postcode=1000-26). I'll ask lonvia as the expert to weigh in.

Simon

PS: we are still trying to find somebody for a short presentation next month in Geneva.

Am 23.04.2024 um 09:53 schrieb imagoiq@posteo.net:

Hello everyone,

I mapped recently around Lausanne, especially above the city (but still part of the commune) for example near "Vers-chez-les-blanc". Around here, if you look for example for "Chemin des Coumenets 26" in map.geo.admin.ch, you'll end up with "Locality: Lausanne 26" and a corresponding new PLZ6/NPA6 with the same number "100026" (the current NPA/PLZ 4 number long is "1000").

I'm sure that the same situation is happening somewhere else in Switzerland and that it was already discussed (but I couldn't find anything here or on the wiki).

How should we map those addresses (Locality and PLZ/NPA)? Does anyone have further information about this PLZ6/NPA6? Should we already add them in another field?

Best regards,

Loïc _______________________________________________ talk-ch mailing list -- talk-ch@openstreetmap.ch To unsubscribe send an email to talk-ch-leave@openstreetmap.ch