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I'm new to GIS and mapping services.

Can anyone tell me what my options are for reverse-geocoding libraries, other than nominatim? I'm most likely going to be working with OpenStreetMap data. So I'll be on the PGSQL/PostGIS stack. Does any of them support the notion of "radius" in their search (which standard Nominatim doesn't support)?

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  • Please remove your second, unrelated question and make it a new question. Once you do that, I think both of your questions will receive upvotes.
    – Jay Cummins
    Jan 4, 2011 at 11:28
  • done....... thx
    – Yahya Cahyadi
    Jan 4, 2011 at 14:03
  • nominatim has become an increasingly comprehensive solution. i need brazilian locations and, until last year, it was close to useless. but now, i get the data i need without depending on paid services.
    – tony gil
    Sep 11, 2013 at 22:49

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If you don't want the hassle of managing the entire OSM dataset required for worldwide address datasets you'll need an online service.

As well as Nominatim, Cloudmade have a geocoding API to work with OSM data. There are reverse geocoding examples here. It includes a distance parameter to allow radius searches. E.g.

http://geocoding.cloudmade.com/8ee2a50541944fb9bcedded5165f09d9/geocoding/v2/find.js?object_type=cafe&around=51.51558,-0.141449&results=5&distance=500

If you aren't tied to OSM then have a look at the Google Reverse Geocoding service and example. The docs state it searches within a "tolerance" but then neglects to say what this tolerance is.

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