External data
================================================

.. note::

   Depending of your application:
   
   * Physiographic static surface data are needed by the :ref:`prep_pgd` program. 
   
   * Atmospheric and surface data are needed by the :ref:`prep_real_case` program.

.. toctree::
   :maxdepth: 2

   external_data/surface_data.rst
   external_data/atmospheric_data.rst