ReferenceMonitor Instantiation
==============================
After creating an ``AirSensor`` object, users follow a similar procedure for
configuring the `ReferenceMonitor` object for importing and accessing FRM/FEM
data.

Continuing with the ``analysis.py`` example script, an instance of the
``ReferenceMonitor`` object is created via the following code:

Continuing with the '*Toco Toucan*' example mentioned in the `Quickstart Guide <../../quickstart.html#example-scenario-toco-toucan>`_,
below, we create an instance of ``ReferenceMonitor`` called ``reference``:

.. code-block:: python

  # Loading reference object for the first time
  reference = sensortoolkit.ReferenceMonitor()

.. note::
  The above code snippet assumes that the user named their instance of the ``sensortoolkit.ReferenceMonitor``
  object ``reference``. If a different name was chosen, replace instances of ``reference`` with the name given
  to the ``sensortoolkit.ReferenceMonitor`` instance to access the instance attributes.

.. important::
  The above code snippet assumes that the user hasn't set up reference data for
  the testing site that were retrieved from a reference data service or source,
  such as the `AQS API`, `AirNow API`, `AirNowTech`, or a locally acquired data set.

  For users that have already gone through the setup process during past evaluations
  for reference data corresponding to a particular site and source and intend to use
  the same data source for subsequent evaluations at the monitoring site, a ``reference_setup.json``
  should have been created during the original setup process.

  In order to point to the particular ``reference_setup.json`` file, the user
  will need to specify additional parameters during the ``sensortoolkit.ReferenceMonitor()`` object instantiation. Please see
  `Instantiating from previously configured objects <../setup_overview.html#instantiating-from-previously-configured-objects>`_
  for more detail about instantiating ``ReferenceMonitor`` objects for
  previously-configured reference data sources.

When running the above code, the following message will be printed to the console
indicating that the user should continue the setup process by running the ``reference_setup()``
method:

.. code-block:: console

  ..reference data source and monitoring site information not specified, run
   ReferenceMonitor.reference_setup() to continue