Awesome

LibLatLon is a handy library for managing geo coordinates, that includes direct/reverse geocoding features

Installation

# config/config.exs

# Use PragDave’s exexif (default)
config :lib_lat_lon, :exexif, :exexif

# Use AM’s exexif
config :lib_lat_lon, :exexif, :nextexif

# mix.exs
def deps do
  [
    {:lib_lat_lon, "~> 0.8"}
  ]
end

Usage

Reverse lookup

LibLatLon.lookup {41.38777777777778, 2.197222222222222}

%LibLatLon.Info{
  address: "Avinguda del Litoral, [...] España",
  bounds: %LibLatLon.Bounds{
    from: #Coord<[
      lat: 41.3876663,
      lon: 2.196602,
      fancy: "41°23´15.59868˝N,2°11´47.7672˝E"
    ]>,
    to: #Coord<[
      lat: 41.3917431,
      lon: 2.2031084,
      fancy: "41°23´30.27516˝N,2°12´11.19024˝E"
    ]>
  },
  coords: #Coord<[
    lat: 41.3899932,
    lon: 2.2000054,
    fancy: "41°23´23.97552˝N,2°12´0.01944˝E"
  ]>,
  details: %{
    city: "Barcelona",
    city_district: "Sant Martí",
    country: "España",
    country_code: "es",
    county: "BCN",
    postcode: "08020",
    road: "Avinguda del Litoral",
    state: "CAT",
    suburb: "la Vila Olímpica del Poblenou"
  },
  meta: %{
    licence: "Data © OpenStreetMap [...]",
    osm_id: "47123759",
    osm_type: "way",
    place_id: "82181109"
  }
}

Direct lookup, using `GoogleMaps`

LibLatLon.lookup(
  "Av. del Litoral, 28, 08005 Barcelona, Spain",
  LibLatLon.Providers.GoogleMaps)

%LibLatLon.Info{
  address: "Av. del Litoral, 28, 08005 Barcelona, Spain",
  bounds: %LibLatLon.Bounds{
    from: #Coord<[
      lat: 41.3893258802915,
      lon: 2.198497180291502,
      fancy: "41°23´21.57316905˝N,2°11´54.58984905˝E"
    ]>,
    to: #Coord<[
      lat: 41.3866279197085,
      lon: 2.195799219708499,
      fancy: "41°23´11.86051095˝N,2°11´44.87719095˝E"
    ]>
  },
  coords: #Coord<[
    lat: 41.3879769,
    lon: 2.1971482,
    fancy: "41°23´16.71684˝N,2°11´49.73352˝E"
  ]>,
  details: %{
    administrative_area_level_1: "Catalunya",
    administrative_area_level_2: "Barcelona",
    country: "Spain",
    locality: "Barcelona",
    postal_code: "08005",
    route: "Avinguda del Litoral",
    street_number: "28"
  },
  meta: %{place_id: "ChIJB801WA6jpBIRLvQ6BHMtKB4", types: ["street_address"]}
}

Currently supported providers

Currently supported sources

latitude/longitude pair in any form (e.g. {lat, lon} tuple);
an address as a binary();
a jpeg image with gps information.

Notes about `GoogleMaps`

To use LibLatLon.Providers.GoogleMaps provider, go get API key from Google and put the following lines into your config.exs file:

config :lib_lat_lon, :provider, LibLatLon.Providers.GoogleMaps
config :lib_lat_lon, :google_maps_api_key, "YOUR_GOOGLE_API_KEY"

or, alternatively, use the system environment variable GOOGLE_MAPS_API_KEY.

Docs / Changelog

0.8.0 — aggressive choice of :exexif/:nextexif through config (since Code.ensure_compiled!/1 works weird)
0.7.1 — preserve defaults when options are given [credits @nathan-louie]
0.7.0 — use runtime config
0.6.0 — the dependency exexif is not expected to be specified in the main application mix.exs file, use either {:exexif, "~> 0.0"} or {:nextexif, "~> 0.0"}; if neither is specified, the compilation error is raised

Documentation can be found at https://hexdocs.pm/lib_lat_lon.