I'm working on a job board in Codeigniter PHP + jQuery where employers enter their location and we use Google Maps API to plot it. While this has had awesome usability results, the problem is when we try to display these locations to job seekers they are muddled and hard to visually discern (they read like this: "02905, 2 miles away","171 John St., 4 miles away", "Providence, RI, 10 miles away".
I want to be able to reverse geolocate from a longitude/latitude to a set level (ideally, city name) so that in the search results I can have the locations be listed like this: "Providence, RI, 10 miles away", "Providence, RI, 5 miles away", "Cranston, RI, 16 miles away".
Is there a way to reverse geocode to city? I see many examples for ways to reverse geocode to nearest addressable location, but no way to control the level.
Hope that's clear! Feel free to comment with any questions you need clarification on.
Reverse geocoding is the process to convert the latitude and longitude coordinates to a readable address. Type the lat long coordinates and press Convert button. Reverse geocoded address will shown below. Also the municipality, subdivision and country name can be found.
FREE SOURCES (e.g. Creative Commons)
Geonames
If you're looking for free (as freedom) sources, you can use Geonames API findNearbyPlaceName.
For example the following returns nearest Placename:
http://api.geonames.org/findNearbyPlaceName?lat=47.3&lng=9&username=demo
More information is available here
http://www.geonames.org/export/web-services.html#findNearbyPlaceName
Freebase
Instead of single point it takes bounded box. Call sample:
http://api.freebase.com/api/service/geosearch?location=[30.2,50.4,30.6,50.8]&location_type=/location/citytown&inside=true&indent=1
Geocoder.ca
Reverse geocoding for North American addresses.
Info: http://geocoder.ca/
Sample call: http://geocoder.ca/?latt=40.70771000786733&longt=-74.0109443664550&reverse=1&allna=1&geoit=xml&corner=1&jsonp=1&callback=test
Map Quest API
Using Open Street Map nominatim service:
http://open.mapquestapi.com/nominatim/v1/search?q=50.4,30.4&format=json
NON FREE SOURCES
Yahoo PlaceFinder
Documentation http://developer.yahoo.com/geo/placefinder/
Sample call:
http://where.yahooapis.com/geocode?q=38.898717,+-77.035974&gflags=R&appid=[yourappidhere]
Google Maps API
Documentation:
http://code.google.com/apis/maps/documentation/geocoding/#ReverseGeocoding
The Google Geocoder, which supports reverse geocoding returns address_components. You just need to pull out the component of the address tagged with locality
and political
if you just want the city name. If you want states as well they are tagged with administrative_area_level_1
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