Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

I currently have an OSM "stack" server (Postgres/PostGIS, Mapnik, OpensLayers) working in a development environment, with almost all the South America countries loaded on the database. Since the applications I'm targeting uses geocoding extensively, I made a test deployment of Nominatim.

While testing, I discovered that almost all searches on Buenos Aires (where my company resides) didn't return a "house number" or something like the "between numbers" of Google Maps. The official Nominatim site didn't return that data neither. But, using the Nominatim service of MapQuest, there is always a house number on the returned XML.

Since MapQuest theoretically use the same data and tools, why they can show that information? Are they using another source of spatial data?

share|improve this question
add comment

2 Answers

Lot of posts says that OSM currently doesn’t have much "house numbers" loaded. Indeed, here in Buenos Aires, a very few streets have house numbers on it.

In OpenStreeMaps.org, if I enter this: "750 lavalle, ciudad autonoma de buenos aires, argentina" ... and click in the first suggested option, the viewer shows the correct street, but the place mark is on the "first number" of the street, probably the first point in the street polyline, ignoring the number, and all different numbers point to the same place mark. If I use Nominating in OSM, all numbers point to the same lat/lon also.

In MapQuest, if I enter the exactly same address, the map shows the correct street, and the place mark is in the correct location of the number 750. I don't know if they are interpolating, but the mark is quite correctly placed. And altering the number, the place mark goes to the correct position too.

If MapQuest uses OSM data, how can MapQuest do that?

Thanks

share|improve this answer
add comment

I did:

curl 'http://api.openstreetmap.org/api/0.6/map/?bbox=-58.38,-34.62,-58.37,-34.61'

and saw one entry that had an address and mentioned MapQuest:

<node id="1184735456" lat="-34.6123820" lon="-58.3719110" user="Polyglot" uid="15188" visible="true" version="1" changeset="7448622" timestamp="2011-03-03T19:11:11Z">
<tag k="addr:city" v="Buenos Aires"/>
<tag k="addr:country" v="AR"/>
<tag k="addr:housenumber" v="390"/>
<tag k="addr:street" v="Defensa"/>
<tag k="name" v="Deybel Catering"/>
<tag k="shop" v="catering"/>
<tag k="source" v="mapquest_critical_addresses"/>
</node>

Is this the sort of thing you're seeing? If not, could you provide an example? I'm pretty sure the OSM home page doesn't let you search by street number, though I realize you weren't using that.

share|improve this answer
    
Sorry, I'll try to clarify my problem. –  dMia Aug 14 '12 at 16:13
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.