On 20/12/2020 16:09, Chris Hill wrote
Using the two separate towns is not correct. The house (or whatever)
is not in Largertown,it is in Smalltown.
By convention addr:* tags are for addressing, not for mapping
administrative boundaries. For the latter we can use is_in tags,
although explicit admin boundaries are preferable.
Postal towns are in invention of Royal Mail. Correct addressing of any
location are set by Local Authorities, not Royal Mail. There are no
postal towns in LA addresses.
It is unfortunate Royal Mail is setting address information in such an
arbitrary manner and that the resulting database is largely proprietary.
But this is still the only addressing system we can use.
In the original example the 'Smalltown' (or indeed village or even
hamlet) translates into addr:city in OSM. I know this may look
confusing as a small villiage is not a city, but that is, IMHO, the
correct way tobuild an OSM UK address.
Adding postal towns is not only redundant, but is misleading. It looks
as though the way to find Smalltown would be first to go to
Largertown, when that is very rarely the case. OSM addresses are
hierarchical, RM addressing is not as postal town is usually a
separate place.
It is common to have country specific addr:* tags but where possible we
should strive to follow OSM tagging conventions, and addr:city is
defined a town/village associated with the postcode.
I should have added that postcodes are a useful addition and my
postcode overlays can help to workout what the correct postcode is for
a given building. You can see more at https://codepoint.raggedred.net/
Yes, I am well aware of your overlays and have used them extensively in
the past to map postcodes in East Anglia and several other areas. Thank
you for providing and maintaining them.
A couple of years ago I've proposed a semi-automatic way of importing
Code-Point Open postcodes to buildings, where building outlines are
already available. As it is an imperfect solution the proposal has
turned out rather unpopular. I still think having postcodes in the
database far outweighs any inaccuracies that could arise, which in
almost all cases are caused by buildings with multiple postcodes.
ndrw6
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