On Wed, 20 Jan 2021 at 10:19, cleary <[email protected]> wrote: > 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. >
There are references to postal_code=* in the Nominatim code base, I'd suggest reporting those examples you found to the Nominatim issue tracker. I'm not sure if you have addresses on opposite sides of a street with different postcodes or not, so my preference is to map the actual address objects rather than adding a postcode to the road.
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