On 19/05/14 08:57, Marc Gemis wrote:
from http://wiki.openstreetmap.org/wiki/Nominatim/FAQ
<quote>
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.
</quote>
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.
I've been slowly adding details such as businesses in the local trading
estates, and just adding postcode + building ID for each. Nominatim
always picks up the correct location data even when a building is
adjacent to a number of roads. But nominatim is not the only tool using
address data, and not having to find adjacent roads because the postcode
is available makes life easy. I have a complete postcode database which
does of course help as well ;)
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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