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Geo Position parsing and conversion
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README.md

GeoPosition

A simple utility to allow you to convert DMS (Degrees, Minutes, Seconds) to a latitude and longitude. The initial driver for this utility was working on an application that took Geo Position information from EXIF data and converted it to lat/lon for use in both the database storage and querying Google's API.

Installation

Add this line to your application's Gemfile:

gem 'geo_position'

And then execute:

$ bundle

Or install it yourself as:

$ gem install geo_position

Usage

I prefer smaller components that can be put together in different ways.

Currently, if given arguments other than something numeric, then the argument will be coerced to a float. If it cannot be coerced to a float, it will raise an exception.

For the conversions, there are some expectations:

  • For latitude, you must provide an argument within the boungs of -90 and 90.
  • For longitude, you must provide an argument within the boungs of -180 and 180.

You can see more information in the objects and errors themselves.

Usage is simple:

Convert from Degrees, Minutes, Seconds, and Direction to a float

# This can be any positive number between 0 and 360. It will be coerced
# to a float and absoluted.
degrees = 12

# Minutes
minutes = 3

# Seconds
seconds = 42.42

# Direction must be one of N, S, E, or W
direction = 'w'

conversion = GeoPosition::Conversion::Dms.new(degrees, minutes, seconds,
direction)

conversion.to_s
=> "12 deg 3' 42.42\" W"

conversion.to_f
=> -12.061783333333333

Convert from Latitude to DMS

latitude = "70.4947"

conversion = GeoPosition::Conversion::Latitude.new(latitude)

conversion.to_s
=> "70 deg 29' 40\" N"

Convert from Longitude to DMS

longitude = "-157.441"

conversion = GeoPosition::Conversion::Longitude.new(longitude)

conversion.to_s
=> "157 deg 26' 27\" W"

Parsing from a DMS string

dms_string = "77 deg 8 42.00 W"

parser = GeoPosition::Parser::Dms.new(dms_string)

parser.degrees
=> 77

parser.minutes
=> 8

parser.seconds
=> 42.0

parser.direction
=> "W"

parser.to_hash
=> {:degrees=>77, :minutes=>8, :seconds=>42.0, :direction=>"W"}

Todo

  • Add a command line component

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request
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