[talk-au] Fwd: OSM Search results return strange stuff for Victoria.

[cleary]

I was told that the correct tag for places such as towns or suburbs is postal_code=* whereas the addr:postcode tag is for individual locations.

However, even with that tag on the suburb boundary, Nominatim is getting it wrong, particularly for streets close to suburb boundaries.  I found multiple examples in Sydney suburbs without much effort. In each case the suburb boundary included the correct postal_code=* tag.  In one instance the postcode shown by Nominatim is the special postcode for PO Boxes in an adjacent suburb, not even the usual postcode for street addresses. I can only presume a business in the area is tagged in OSM with its postal address, a PO Box in the adjacent suburb, and that has been taken by Nominatim as the postcode for this area. 

Perhaps we need to tag individual streets with postcodes, especially streets near suburb boundaries. 

One final thought ... perhaps Nominatim reads only addr:postcode=* tags and does not understand postal_code=*   If so, that might explain the anomalies.






On Wed, 20 Jan 2021, at 9:15 AM, Graeme Fitzpatrick wrote:
> Re-sent to list as well! 
> 
> Thanks
> 
> Graeme
> 
> 
> ---------- Forwarded message ---------
> From: *Graeme Fitzpatrick* <graemefitz1 at gmail.com>
> Date: Wed, 20 Jan 2021 at 08:14
> Subject: Re: [talk-au] OSM Search results return strange stuff for Victoria.
> To: Jonathon Rossi <jono at jonorossi.com>
> 
> 
> 
> 
> 
> On Tue, 19 Jan 2021 at 21:41, Jonathon Rossi <jono at jonorossi.com> wrote:
> > I've not mapped them before but curious now why we don't seem to have imported addr:postcode tags for suburbs, Nominatim uses them before centroids.
> > 
> > Surely addr:postcode doesn't have to be unique because it sounds like some countries have postcodes based on postal routes or other less administrative boundaries.
> 
> From recent posts re addresses on the tagging list, the UK even has 
> unique postcodes for individual buildings, & even for different 
> businesses / organisations inside the one building!
> 
> Thanks
> 
> Graeme
> 
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