On 30/12/2010 20:33, Richard Welty wrote:
Unclassified RoadBiittig Road, Sliters, Saratoga, 12018, ニューヨーク州,
United States of America
<http://www.openstreetmap.org/?minlon=-73.6051635742188&minlat=42.612548828125&maxlon=-73.5850830078125&maxlat=42.6175994873047>
I'm not at all clear on why Saratoga is showing up at all. Saratoga
County is a bit
north and west of here; Biittig Road is in Rensselaer County (note that
i did just
fix some county border issues with Rensselaer County, it was mislabled
Franklin County when it was imported, and the admin_level was missing
from one segment. i need to go look at the eastern border with
Massachusetts,
i think that's wrong for Rensselaer County as well. i did these lookups
before i
made the corrections, and i don't know how rapidly changes like this impact
Nominatim.)
can someone involved in the Nominatim comment on this, and what needs to be
done either on the map data side or the Nominatim side to get results that
are more consistent with what an ordinary user-off-the-street might be
expecting?
I'm not involved in Nominatim, but some comments anyway:
You can go to this page and search for a place:
http://nominatim.openstreetmap.org/
In the results, click the little link for "Details", which will give
more details of how Nominatim figured out the address. So for Biitig
Road it gives this page:
http://open.mapquestapi.com/nominatim/v1/details.php?place_id=14428803
As you can see from that page, it is using the place=county node for
Saratoga. If counties etc are just mapped as nodes, then Nominatim has
to guess which county a place is in, based on which node is nearest. And
in this example, the node for Saratoga county is nearer to Biitig Road
than the node for Rensselaer county.
So its much more useful to map counties as areas/multipolygon relations,
and delete the place=county nodes. If you have now done this, and its a
complete border, and tagged correctly, then Nominatim should use it for
the address.
The same applies for cities/towns/villages etc - if they have defined
boundaries, then its a good idea to map them instead of just a node.
Have you got a link for the way/relation for Rensselaer County? I could
have a look at it, and see if its tagged correctly and complete.
Note that nominatim.openstreetmap.org page says its using data from
2010/12/28, so newer changes won't show up yet.
Craig
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