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Retrieve the osm_id (from Postgres DB) if I have LAT/LON

I see that you can use nominatim with an HTTP POST for this. However, I went to the trouble of loading the OSM database into postgres, and I want to take advantage of the speed of querying it from my DB, without an HTTP call.

Is there a SQL QUERY that can get the osm_ids associated with a specific latitude/longitude??

Thanks so much. Ive spend dozens of hours trying to figure this out!

latitude longitude osm_id

asked 14 Nov '12, 02:22

sfrattura
1●1●1●1
accept rate: 0%

2 Answers:

This depends on how you have imported the data. For an osm2pgsql import, the query would look like this:

SELECT 
   osm_id
FROM
   planet_osm_point (or _line, or _polygon)
WHERE
   ST_DWITHIN(mypoint, way, mydistance);

What you put for mypoint and mydistance depends on what projection your data is in; if you have imported without -l, i.e. your data is in spherical mercator, you would have to put something like

ST_TRANSFORM(ST_SETSRID(ST_MAKEPOINT(mylon, mylat), 4326), 900913)

and for mydistance you would put the distance in spherical mercator units, i.e. roughly metres.

The query will then return all IDs within the given distance of the point.

answered 14 Nov '12, 08:16

Frederik Ramm ♦
82.5k●92●720●1273
accept rate: 23%

I have a simliar problem trying to show some localities only having the lat long data availabe. Can you point me to a different resolution for this problem. I'm using mapserver on windows and openlayers. Thank you

answered 13 Mar '14, 09:18

Victor1989
1
accept rate: 0%

This is a completely different question, and you'd be better off asking it as a separate question, fully explaining what you want to do and what your setup is.

(13 Mar '14, 10:01) Richard ♦