OsMapRef

This gem allows you to gather U.K. Ordnance Survey Eastings, North, and Map References from a range of text inputs.

Installation

Add this line to your application's Gemfile:

gem 'os_map_ref'

And then execute:

$ bundle

Or install it yourself as:

$ gem install os_map_ref

Usage

To convert a map reference to eastings and northings:

location = OsMapRef::Location.for 'ST5880171043'

location.easting       == 358801
location.northing      == 171043
location.map_reference == 'ST 58801 71043'

To convert eastings and northings to a map reference:

location = OsMapRef::Location.for '358801, 171043'

location.easting       == 358801
location.northing      == 171043
location.map_reference == 'ST 58801 71043'

From OS Map Reference to Longitude and Latitude

If your end result needs to be longitude and latitude, you can combine the OsMapRef output with that of another gem: global_convert

For example

require 'global_convert'
require 'os_map_ref'

os_location = OsMapRef::Location.for 'ST 58801 71043'

location = GlobalConvert::Location.new(
  input: {
    projection: :osgb36,
    lon: os_location.easting,
    lat: os_location.northing
  },
  output: {
    projection: :wgs84
  }
)

puts "Latitude = #{location.lat} in radians."
puts "Longitude = #{location.lon} in radians."

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/reggieb/os_map_ref.

License

THIS INFORMATION IS LICENSED UNDER THE CONDITIONS OF THE OPEN GOVERNMENT LICENCE found at:

http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3

The following attribution statement MUST be cited in your products and applications when using this information.

Contains public sector information licensed under the Open Government license v3

About the license

The Open Government Licence (OGL) was developed by the Controller of Her Majesty's Stationery Office (HMSO) to enable information providers in the public sector to license the use and re-use of their information under a common open licence.

It is designed to encourage use and re-use of information freely and flexibly, with only a few conditions.