Geocoding 5000 addresses in php script

Question

I\'m looking to geocode over 5000 addresses at once in a PHP script (this will only ever be run once).

I have been looking into google as a potential resource for doing

Answer 1

As @Bart Kiers says, there's a limit on the number of requests you can do in a 24hr period; there's also a "not too fast" per-hour (?) limit. I'd suggest that you divide (seconds per day) 86400/2500 (the limit) to get a query rate that shouldn't exceed the "too fast" per/hour limit. It comes out to about one query per 35 seconds, which should get you the results in two days.

However, do check the return codes: if the service starts returning 620, stop and give it a rest for some time, else you risk a ban.

Answer 2

You could use Bing Maps instead: the Spatial Data API is made for batch geocoding thousands of addresses at once (that link is even a detailed tutorial on how to use it with PHP).

You just need to register a key at http://www.bingmapsportal.com but that's free and fast (you get the confirmation email within minutes).

Answer 3

Is there a limit to the number of geocode requests I can submit?

If more than 2,500 geocode requests in a 24 hour period are received from a single IP address, or geocode requests are submitted from a single IP address at too fast a rate, the Google Maps API geocoder will begin responding with a status code of 620.

[...]

If you need to submit a very large set of addresses to the Geocoding Web Service to cache for later use, you should consider Google Maps API Premier, which provides a separate batch geocoding quota for this purpose.

-- http://code.google.com/apis/maps/faq.html#geocoder_limit

As @Pekka mentioned: note that Google's terms of service forbid geocoding stuff for purposes other than showing it on a map.

Answer 4

What you're trying to do is indeed not according to Google's terms of service.

That said, Google will start returning 'over-quota' responses if you don't pause at least 250mS between geocoding requests.

In practice, if you only make 2 requests a second you won't get throttled until the 2'500 day's limit.

Answer 5

The most reliable solution is to download geolocation database to your host so that you can do unlimited queries.

http://www.google.de/search?q=geolocation+database&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:ru:official&client=firefox#hl=en&expIds=17259,17315,18168,23628,25646,25834,26637,26746,26761,26849&xhr=t&q=geolocation+database+download&cp=22&pf=p&sclient=psy&client=firefox&hs=MvK&rls=org.mozilla:ru%3Aofficial&source=hp&aq=f&aqi=&aql=&oq=geolocation+database+d&gs_rfai=&pbx=1&fp=d950b79c3319a56e