Remote Geocoding
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Geocoding is the process of finding geographic coordinates from other data like addresses or zip codes. There are many remote geocoding services that can be used through an API but they have different formats, limits, and concepts of precision. Geo::Coder::Many provides a single interface to query multiple geocoding services and intelligently handles caching, failover, and common use cases. The code example shows how to create a Geo::Coder::Many object, add different geocoding services to it, set filters and pickers, and perform a geocoding request.
Remote Geocoding
- 1. Remote Geocoding Ed Freyfogle London Perl Workshop, 4 Dec 2010
- 2. What is geocoding? Geocoding is the process of finding associated geographic coordinates (often expressed as latitude and longitude) from other geographic data, such as street addresses, or zip codes (postal codes) See also: http://www.lokku.com/lpw06_geocoding/
- 3. remote geocoding? http://www.flickr.com/photos/jennratonmort Magical internet elves try to answer your every geocoding whim across the miracle of HTTP
- 4. The problem: many remote geocoders Geo::Coder::Google Geo::Coder::Yahoo Geo::Coder::Placefinder Geo::Coder::Mapquest Geo::Cloudmade Geo::Coder::Bing Geo::Coder::OSM Geo::Coder::SimpleGeo And more …
- 5. the small print registration, keys rate limits usage limits http://www.flickr.com/photos/mrwilleeumm
- 6. But different … quality query formats response formats concepts of precision version changes http://www.flickr.com/photos/goldberg
- 7. Geo::Coder::Many One interface Single precision definition Intelligent caching and failover Easily set picker and filter methods, with common use cases predefined http://www.flickr.com/photos/vermininc
- 8. And now for some code http://www.flickr.com/photos/vermininc use Geo::Coder::Locatorize; use Geo::Coder::WhereIzIt; use Geo::Coder::Many; use Geo::Coder::Many::Util qw( country_filter ); # Create the Geo::Coder::Many object # using a 'weighted round robin' # scheduling method my $options = { cache => $cache_object, scheduler_type => 'WRR', }; my $geocoder_many = Geo::Coder::Many->new( $options );
- 9. … continued http://www.flickr.com/photos/vermininc # Create and add a geocoder my $Locatorize = Geo::Coder::Locatorize->new( appid => 'mY_loCat0r1Ze_iD' ); my $Locatorize_options = { geocoder => $Locatorize, daily_limit => 2500, }; $geocoder_many->add_geocoder( $Locatorize_options ); # Create and add a second geocoder my $WhereIzIt = Geo::Coder::WhereIzIt->new( apikey => 'mY_WhERiz1t_kEy' ); my $WhereIzIt_options = { geocoder => $WhereIzIt, daily_limit => 4000, }; $geocoder_many->add_geocoder( $WhereIzIt_options ); # Use a filter callback from Geo::Coder::Many::Util # we only want results from the UK # fuck you London, Ontario! $geocoder_many->set_filter_callback(country_filter('United Kingdom')); # Use a built-in picker callback $geocoder_many->set_picker_callback('max_precision');
- 10. Let’s do this thing http://www.flickr.com/photos/vermininc my $result = $geocoder_many->geocode({ location => 'London NW1 5LS' }); if (defined $result) { print "Country: ", $result->{country}, "\n"; print "Longitude: ", $result->{longitude}, "\n"; print "Latitude: ", $result->{latitude}, "\n"; print "Location: ", $result->{location}, "\n"; print "Response code: ", $result->{response_code}, "\n"; print "Address: ", $result->{address}, "\n"; print "Precision: ", $result->{precision}, "\n"; print "Geocoder: ", $result->{geocoder}, "\n"; } else { print "Failed to geocode!\n"; }
- 11. Possible response codes http://www.flickr.com/photos/vermininc 200 Success 210 Success (from cache) 401 Unable to find location 402 All geocoder limits reached
- 12. We need YOUR help Add support for Geo::Coder::GoogleV3 (underway as we speak) Navteq, Cloudmade, TomTom OpenSpace, country specific services? More feedback Move to github More tests http://www.flickr.com/photos/revcyborg
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- 14. Thanks! About Nestoria blog.nestoria.co.uk @nestoria About me @freyfogle We’re hiring: http://www.lokku.com/jobs/