[Geocoding] [OpenStreetMap] #4575: Wrong province(state) in address even after is_in tag is specified

[OpenStreetMap]

#4575: Wrong province(state) in address even after is_in tag is specified
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 Reporter:  namuori    |      Owner:  geocoding@…
     Type:  defect     |     Status:  new
 Priority:  minor      |  Milestone:
Component:  nominatim  |    Version:
 Keywords:             |
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 After fixing the issue that was ticket #4557, I'm now noticing that
 Nominatim is picking the wrong, adjacent province for the addresses for
 many of the cities in Gyeonggi-do (Gyeonggi Province). Here are a few
 examples.

 Dongducheon:
 http://nominatim.openstreetmap.org/details.php?place_id=3977812

 This city is well within Gyeonggi-do's border, yet it's being listed under
 Gangwon-do.

 Paju:
 http://nominatim.openstreetmap.org/details.php?place_id=2688795

 This one simply doesn't have any province assigned to it.

 Anseong:
 http://nominatim.openstreetmap.org/details.php?place_id=3226407

 This one shows up to be under Chungcheongbuk-do.


 What's interesting to note is that these nodes are linked to admin
 borders, and these properly list them under Gyeonggi-do:
 http://nominatim.openstreetmap.org/details.php?place_id=2486970788
 http://nominatim.openstreetmap.org/details.php?place_id=2486970801
 http://nominatim.openstreetmap.org/details.php?place_id=2486970785

 I'm suspecting that Gyeonggi-do node...
 http://nominatim.openstreetmap.org/details.php?place_id=2487216741

 ...is somehow not properly assigned to the cities. I've even explicitly
 put is_in tags in the city nodes as FAQ suggested, but it didn't do any
 good.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4575>
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