@spec dted(String.t()) :: {:ok, Sidereon.Terrain.Dted.t()} | {:error, term()}

@spec height(Sidereon.Terrain.Dted.t(), number(), number(), keyword()) ::
  {:ok, float()} | {:error, atom()}

@spec load_tile(String.t()) :: {:ok, Sidereon.Terrain.DtedTile.t()} | {:error, term()}

@spec tile_elevation(Sidereon.Terrain.DtedTile.t(), number(), number()) ::
  {:ok, integer()} | {:error, atom()}