.. _add_filters:

========================================
Adding Photometric Filters
========================================
If the user wants to add new photometric filters to SPISEA, there are 4 main steps:

  1) Save the filter transmissions as text files in a new sub-directory in the top-level ``filt_func`` directory.
  2) Define a new function in ``filters.py`` that reads a unique filter string the user assigns to the new filters,
     and then read the appropriate data files from the new ``filt_func`` sub-directory. 
  3) Edit the ``get_filter_info()`` function  in ``synthetic.py`` to
     call the new function in ``filters.py`` when the new filter
     string is called.
  4) Edit the ``get_obs_str()`` function in ``synthetic.py`` to
      convert between column name and filter string (e.g input string
      for get_filter_info) for the new filters.

Additional documentation on this is coming soon. In the meantime, let us know on the  Github `issue tracker
<https://github.com/astropy/SPISEA/issues>`_ if you'd like to
implement new photometric filters.