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Location from IP, geocoding, distance calculation, and geo/map utilities
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geo_magic.gemspec

README.textile

Geo Magic

This little clever project was the result of me not being satisfied with existing Geo Location and Coding solutions out there to suit my needs.
Many of the projects did not return quality data (fx when requesting IP or location) and others were tightly bound to Active Record and SQL databases for calculations etc.

This little gem should get you going…

Some of the main features:

  • Get IP and location data using freegeoip.net
  • Calculate distance between map points using various algorithms (haversine, spherical, vincenty, straight line)
  • Geocoding and Reverse Geocoding using adapters (currently: Graticule and Geocode gems)
  • Calculate nearest points from a point
  • Find points within a radius (circle or square from center)
  • Calculate points within a bounding box

You can either include the complete library like this:

require 'geo_magic'

Or require only the functionality you need (see usage examples below)

IP and location data

Uses freegeoip.net JSON API

RSpec 2 examples of API usage

require 'geo_magic/remote'

it "should get the remote IP address" do
  ip = GeoMagic::Remote.my_ip    
  puts "ip: #{ip.inspect}"    
end

it "should get other location" do
  location = GeoMagic::Remote.location_of '74.200.247.59'
  puts "location: #{location['city']}"    
end

it "should get my location" do
  location = GeoMagic::Remote.my_location
  puts location
  puts "location: #{location['city']}"    
end  

Distance calculation

RSpec 2 examples of API usage

require 'geo_magic/calculate'

it "calculates distance using array args" do
  dist = GeoMagic::Calculate.distance [@long1, @lat1], [@long2, @lat2]    
  puts dist    
end

it "calculates distance using Point args" do
  from_point = GeoMagic::Point.new @long1, @lat1    
  to_point = GeoMagic::Point.new @long2, @lat2

  puts "from: #{from_point}, to: #{to_point}"

  dist = GeoMagic::Calculate.distance from_point, to_point
  puts dist    
end

it "calculates distance using Hash args (short)" do
  from_point = GeoMagic::Point.new(@long1, @lat1).to_hash :short
  to_point = GeoMagic::Point.new(@long2, @lat2).to_hash :short

  puts "from: #{from_point}, to: #{to_point}"

  dist = GeoMagic::Calculate.distance from_point, to_point
  puts dist    
end  

Geocoder adapters

The following Geocode adapters are supported

  • Geocode
  • Graticule
  • GraticuleMulti

Single Geocode Geocoder:

  # Use Graticule Multi geocoder, which tries multiple geocode services in succession!
  geocoder = GeoMagic.geo_coder(:type => :geocode)
  geocoder.configure File.expand_path('../fixtures/map_api_keys.yaml', File.dirname(__FILE__)), :development
  location = geocoder.instance.geocode "Mullerstrasse 9, Munich"
  location.city

Single Graticule Geocoder:

  # Use Graticule Multi geocoder, which tries multiple geocode services in succession!
  geocoder = GeoMagic.geo_coder(:type => graticule)
  geocoder.configure File.expand_path('../fixtures/map_api_keys.yaml', File.dirname(__FILE__)), :development
  location = geocoder.instance.geocode "Mullerstrasse 9, Munich"
  location.city

Multi Graticule Geocoder:

  # Use Graticule Multi geocoder, which tries multiple geocode services in succession!
  geocoder = GeoMagic.geo_coder(:type => graticule_multi)
  ..

Multi Graticule Customization:

  # Use Graticule Multi geocoder, which tries multiple geocode services in succession!
  geocoder = GeoMagic.geo_coder(:type => graticule_multi)
  location = geocoder.instance(:timeout => 3) do |result|
    [:address, :street].include?(result.precision)]
  end
  ..

Geocoder in Rails:

  geocoder = GeoMagic.geo_coder(:env => :rails).configure

  location = geocoder.instance.geocode "Mullerstrasse 9, Munich"
  location.city.should == 'Munich'

By default, the configuration expects a file in config/map_api_keys.yml containing the keys for each environment (see spec/fictures folder).
This can be customized if needed: geocoder.configure '../my_keys.yaml'

Create random points in Radius

From a given radius, you can create random points either in a square or circle radius.

  • create_points_in_square
  • create_points_in_circle

Example use:

  radius = center_point.within(10.km)
  square_points = radius.create_points_in_square 6
  circle_points = radius.create_points_in_circle 4  

Points within an area or distance

Within distance:

@points.as_map_points.within_distance 4.km, :from => @center_point

The closest n points:

@points.as_map_points.the_closest 4, :from => @center_point

Or using container objects (objects containing a location):

@people.as_map_points.the_closest 4, :from => @house

Where @people is an array of Person and @house is an instance of House and where both House and Person has a #location, #to_point or #point method that returns an object
with latitude and longitude methods that each return a float.

Within bounding rectangle:

rectangle = GeoMagic::Rectangle.new(GeoMagic::Point.new(-115, 50), GeoMagic::Point.new(-100, 20))
# or
# rect = GeoMagic::Rectangle.create_from_coords lat1, long1, lat2, long2
@points.as_map_points.within_rectangle rect, :from => @center_point

Meta magic

You can also include the functionality directly into any class like this

class Map
  include GeoMagic::Calculate
end

class MapCalc
  geo_magic :calc
end

it "calculates distance using array args" do
  dist = Map.distance [@long1, @lat1], [@long2, @lat2]    
  puts dist    
end

it "calculates distance using array args" do
  dist = MapCalc.distance [@long1, @lat1], [@long2, @lat2]    
  puts dist    
end  

Contributing to geo_magic

  • Check out the latest master to make sure the feature hasn’t been implemented or the bug hasn’t been fixed yet
  • Check out the issue tracker to make sure someone already hasn’t requested it and/or contributed it
  • 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.

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