Graticule is a geocoding API for looking up address coordinates. It supports many popular APIs, including Yahoo, Google, Geocoder.ca and Geocoder.us.

require 'rubygems'
require 'graticule'
geocoder = Graticule.service(:google).new "api_key"
location = geocoder.locate "61 East 9th Street, Holland, MI"

Graticule includes 3 different distance formulas, Spherical (simplest but least accurate), Vincenty (most accurate and most complicated), and Haversine (somewhere inbetween).

geocoder.locate("Holland, MI").distance_to(geocoder.locate("Chicago, IL"))
#=> 101.997458788177

Graticule includes a command line interface (CLI).

$ geocode -s yahoo -a yahookey Washington, DC
Washington, DC US
latitude: 38.895222, longitude: -77.036758

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If you find what you might think is a bug:

1. Check the GitHub issue tracker to see if anyone else has had the same issue.
2. If you don’t see anything, create an issue with information on how to reproduce it.

If you want to contribute an enhancement or a fix:

1. Fork the project on GitHub.
2. Make your changes with tests.
3. Commit the changes without making changes to the Rakefile, VERSION, or any other files that aren’t related to your enhancement or fix
4. Send a pull request.