missing info from local nominatim instance

General talk
1

The search https://nominatim.openstreetmap.org/lookup?osm_ids=N45591432&format=json
gives

place_id	"221307"
osm_type	"node"
osm_id	"45591432"
lat	"52.1811005"
lon	"4.9715417"
display_name	"Oud-Aa, Utrecht, Netherlands, 3626, Netherlands"
class	"place"
type	"hamlet"
importance	"0.296615655400926"
address	
hamlet	"Oud-Aa"
state	"Utrecht"
postcode	"3626"
country	"Netherlands"
country_code	"nl"

while the same search on my local nominatim , which was created using planet.osm in the last month, is missing some key info (namely lat/lon and postcode) - any clues why this would be? It seems this node was last updated 8 years ago so I dont blv its due to a differing planet.osm

place_id	"223606"
licence	"Data © OpenStreetMap contributors, ODbL 1.0. https://osm.org/copyright"
osm_type	"node"
osm_id	"45591432"
lat	null
lon	null
display_name	"Oud-Aa, The Netherlands"
class	"place"
type	"hamlet"
importance	"0.275"
address	
hamlet	"Oud-Aa"
country	"The Netherlands"
country_code	"nl"
2

Nominatim does much, much more than a simple query of the tags.

It analyzes the data with spatial queries (PostgreSQL/PostGIS) and determines in which polygon (country, state, country, zip code area, …) this object is located. And if such a polygon is not available (like zip code areas in many countries), it will try other algorithms.

walter

3

yes , I was expecting those nice nominatim algorithms to work locally in the same way as on the public nominatim server and thus to return the same inferred values for postcode , latlon . More than that, I have run into cases where my local instance returns nothing while the public returns everything expected. I blv. I’ve made as complete a nominatim install as possible according to the install instructions , including all optional datasources (tiger, wikipedia etc)

4

Nominatim (OSM Live) is using external sources too - data which does not exist in the OSM database.

see https://forum.openstreetmap.org/viewtopic.php?pid=690963#p690963

Regards
walter

5

I notice that you search Nominatim for a node id. Is it possible that that ID refers to a different object in your instance?
Do you also get different results when you search e.g. for “Oud-Aa”?

6

You can see in the results that the nodes are referring to the same object (as it should be ) . When searching the public instance for oud-aa the first result is that same node 45591432 . I can’t actually text seach locally right now due to a php issue https://github.com/openstreetmap/Nominatim/issues/1082