GeoDistance – geo distance calculations
Calculates the Geo distance between two locations using longitude and latitude.
This is done using “pure” Math formulas without resorting to Active Record or SQL DB functionality
This gem is meant to be a replacement for those geo distance utils out there that use built in SQL DB functionality for their calculations!
The formulas curently supported are
- Haversine
- Spherical
- Vincenty
- Flat
Install & Usage
require 'geo-distance' it "should work" do lon1 = -104.88544 lat1 = 39.06546 lon2 = -104.80 lat2 = lat1 dist = GeoDistance.distance( lat1, lon1, lat2, lon2 ) # in radians dist = GeoDistance::Haversine.geo_distance( lat1, lon1, lat2, lon2 ).to_meters # Change to (lng, lat) mode GeoPoint.coord_mode = :lng_lat p1, p2 = [[lon1, lat1].geo_point, [lon2, lat2].geo_point] dist = GeoDistance::Haversine.geo_distance( lon1, lat1, lon2, lat2) dist = GeoDistance::Haversine.geo_distance( p1, p2).to_miles puts "the distance from #{lat1}, #{lon1} to #{lat2}, #{lon2} is: #{dist.meters} meters" dist.feet dist.meters dist.kms dist.miles end
Distance API
The call to distance returns an instance of GeoDistance
dist = GeoDistance::Haversine.distance( lat1, lon1, lat2, lon2 )
The #kms, #meters, #miles and #feet methods return an instance og GeoUnit
dist.kms
Setting default algorithm
You can also set a default algorithm to use…
The following will use the Haversine algorithm:
GeoDistance.default_algorithm = :haversine dist = GeoDistance.distance( lat1, lon1, lat2, lon2 )
GeoDistance is used in the geo_magic gem
Contributing to geo-distance
- Check out the specs and add specs to spec any added features or changes!
- Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet
- Fork the project
- Start a feature/bugfix branch
- Commit and push until you are happy with your contribution
- Make sure to add tests for it. This is important so I don’t break it in a future version unintentionally.
- Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.
Copyright
Copyright © 2011 Kristian Mandrup. See LICENSE.txt for
further details.