Calculates the haversine distance between two locations using longitude and latitude
MIT License
h1. Haversine Distance
This gem calculates the Haversine distance between two points given their longitude and latitude. This is done using trigonometry without ActiveRecord or SQL. See http://en.wikipedia.org/wiki/Haversine_formula for details on the Haversine formula.
This is a replacement for all geo libraries that use built-in SQL DB functionality for their calculations.
h2. Install & Usage
Install this gem with @gem install haversine@. Calling @Haversine.distance@ with four lat/lon coordinates returns a @Haversine::Distance@ object which can provide output in kilometers, meters, miles, or feet.
Convenience aliases for the measurements exist:
Note that @to_m@ is the distance in meters, not miles.
If you have lat/lon pairs stored in an array, you can alternately provide two arrays when calling @Haversine.distance@:
Note: Haversine is used in the "geo_magic":https://github.com/kristianmandrup/geo_magic gem
h2. Contributing to haversine
h2. Copyright
Copyright (c) 2011 Kristian Mandrup. See LICENSE.txt for further details.