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srtm

0.5.1
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A small library that provides a simple interface to query locations on the earth for elevation data from the NASA Shuttle Radar Topography Mission (SRTM)

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srtm lib source cache.ex
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lib/source/cache.ex 

defmodule SRTM.Source.Cache do

  use SRTM.Source

  @moduledoc false



  alias SRTM.Client



  @impl true

  def fetch(%Client{cache_path: cache_path}, {lat, lng}) do

    hgt_path = Path.join([cache_path, name(lat, lng) <> ".hgt"])



    if File.exists?(hgt_path) do

      {:ok, hgt_path}

    else

      {:error, :not_loaded}

    end

  end

end