[Talk-GB] UK postcodes on each side of the road

Marc Gemis marc.gemis at gmail.com
Mon May 19 07:57:54 UTC 2014

from http://wiki.openstreetmap.org/wiki/Nominatim/FAQ

Why doesn't Nominatim process addr:* tags on buildings[edit]

For performance reasons buildings (and other low level features) are not
fully indexed, but are instead simply inherit from their parent street. As
such many addr:* tags except those directly related to the building are
ignored. For instance add:town will never be used - instead the town of the
road will be used.

This is why I ask whether it works for you to have postcodes on the address
nodes. My experiences is that they are useless for Nominatim.

On Mon, May 19, 2014 at 9:35 AM, Lester Caine <lester at lsces.co.uk> wrote:

> On 19/05/14 08:06, Marc Gemis wrote:
>>      > and in this case, the street and other
>>      > location data can be provided by tags on a street rather than
>>      > duplicating that data unnecessarily on every building ...
>>     Surely that’s what associatedStreet relations are for.
> > Does Nominatim already supports associatedStreet relations to pick up
> > the postcode ?
> > When I tried it 8 months ago, it just used it to find a street segment
> > (the first one in the relation). It then took the name of that street
> > segment as the street name for the address.
> associatedStreet is just another unnecessary layer in the way it is
> currently defined. I see little point having the house identifier
> duplicated. Where a postcode uniquely defines a set of higher level
> relations then that is all we need. Where a postcode is not available, then
> a link to a street way has a place, but in many cases creating complex
> relations just makes the problem worse. Personally I would prefer to see
> editors providing adjacent objects as options for populating some of the
> tag elements, so if a postcode is identified it can be duplicated.
> Nominatim does work nicely without the need for the added complication so
> I'd suggest at least in the UK we do not use 'associatedStreet' at all.
> --
> Lester Caine - G8HFL
> -----------------------------
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