PDAFomi_set_searchtype

This page documents the function PDAFomi_set_searchtype of PDAF, which was introduced with PDAF 3.1.

In PDAF V3.1 we optimized the search for observations within the localization cut-off radius.

The interface is:

  INTEGER FUNCTION PDAF_localfilter()

without arguments. The return value is

• 1 for local filters (including ENSRF/EAKF),
  
• 0 for global filters (including LEnKF, which performs covariance localization)

The return value can be directly used, e.g. as

  IF (PDAF_localfilter() == 1) THEN
    CALL PDAF3_assimilate_local(...)
  ELSE
    CALL PDAF3_assimilate_global(...)
  ENDIF

Notes:

• The difference between the return values 0 and 1 is mainly the way how PDAF-OMI handles observations.
• For the ENSRF/EAKF, PDAF_localfilter() also returns the value 1. This is because the observation handling for the ENSRF/EAKF uses the same approach as for domain-localized filters