Haversine is a formula to calculate the great-circle distance between two points

Haversine is Ruby library for haversine a formula to calculate distance between two GEO Location. Because Earth is not flat!

References

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Inspired by Landon Cox at www.esawdust.com/blog/gps/files/HaversineFormulaInRuby.html And www.movable-type.co.uk/scripts/latlong.html

You can totally install it as a Gem

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Haversine is readily available as a Ruby gem.

$ [sudo] gem install haversine_distance

The Haversine source is available at GitHub:

$ git clone git://github.com/jirapong/haversine.git

Feedback & Patch are welcome.

And how to use

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require 'haversine'

lat_a = 51.885
lng_a = 0.235

lat_b = 49.008
lng_b = 2.549

km = Haversine.distance(lat_a, lng_a, lat_b, lng_b);

Credits

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This library is written by Jirapong Nanta (@jirapong)

Boring legal stuff

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Copyright © 2011, Jirapong Nanta

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.