= PDAF_local_type = 

This page documents the function `PDAF_local_type` of PDAF, which was introduced with PDAF 3.0.

The function is an alternative to the routine [wiki:PDAF_get_local_type]. With `PDAF_local_type` the return value of the function canbe directly used, while for `PDAF_get_local_type` the return value is an argument of the routine.

The function returns the information on the localization type of the selected filter. With this one can distinguish filters using domain localization (LESTKF, LETKF, LSEIK, LNETF), covariance localization (LEnKF), or covariance localization with observation handling like domain localization (ENSRF/EAKF). 

The function can be called in `init_dim_obs_OBSTYPE`, of each observation module to control whether [wiki:PDAFomi_set_localize_covar] is called to initialize covariance localization.

The interface is:
{{{
  INTEGER FUNCTION PDAF_local_type()
}}}
without arguments. The return value is
 * (0) no localization; global filter
 * (1) domain localization (LESTKF, LETKF, LNETF, LSEIK)
 * (2) covariance localization (LEnKF)
 * (3) covariance localization, but observation handling like domain localization (ENSRF/EAKF)



**Notes:**
 * The function can also be used as an alternative to `PDAF_localfilter` in `assimilate_pdaf`.
 * The return value can be directly used, e.g. as
{{{
  IF (PDAF_local_type() > 0) THEN
    CALL PDAFomi_set_localize_covar(...)
}}}