GeohashNif

Drop in replacement fot the Elixir native Geohash encode/decode library implemented as a NIF

Warning

neighbors has a breaking change, see the find neighbors.

Documentation

Usage

Encode coordinates with Geohash.encode(lat, lon, precision \\ 11)

iex(1)> Geohash.encode(42.6, -5.6, 5)
"ezs42"

Decode coordinates with Geohash.decode(geohash)

iex(1)> Geohash.decode("ezs42")
{42.605, -5.603}

Find neighbors

warning

There is a difference in the implementation of the neighbors function, the original library returns a map of string => string this one returns a map of atom: string.

iex(1)> Geohash.neighbors("ezs42")
%{
  e: "ezs43",
  n: "ezs48",
  ne: "ezs49",
  nw: "ezefx",
  s: "ezs40",
  se: "ezs41",
  sw: "ezefp",
  w: "ezefr"
}

Find adjacent

iex(1)> Geohash.adjacent("ezs42","n")
"ezs48"

Get bounds

iex(1)> Geohash.bounds("u4pruydqqv")
%{
  max_lat: 57.649115324020386,
  max_lon: 10.407443046569824,
  min_lat: 57.649109959602356,
  min_lon: 10.407432317733765
}

Installation

1. Add geohash_nif to your list of dependencies in mix.exs:

   def deps do

    [{:geohash_nif, "~> 1.0"}]

   end

2. Ensure geohash is started before your application:

   def application do

    [applications: [:geohash_nif]]

   end