= PDAFomi_put_state_lenkf = This page documents the routine `PDAF_put_state_lenkf` of PDAF. The routine is used to execute the analysis step of the localized EnKF (LEnKF) with PDAF-OMI. The routine is typically called in `assimilate_pdaf` or directly in the model code. The general aspects of the filter specific routines `PDAFomi_put_state_*` are described on the page [ModifyModelforEnsembleIntegration Modification of the model code for the ensemble integration] and its sub-page on [InsertAnalysisStep inserting the analysis step]. The routine is used in the 'flexible' parallelization implementation variant of the data assimilation system. With the 'fully-parallel' implementation variant, the routine [wiki:PDAFomi_assimilate_lenkf PDAFomi_assimilate_lenkf] is used. Here, we list the full interface of the routine. The interface when using the LEnKF is the following: {{{ SUBROUTINE PDAFomi_put_state_lenkf(U_collect_state, & U_init_dim_obs_pdafomi, U_obs_op_pdafomi, & U_prepoststep, U_localize_covar_pdafomi, & status) }}} with the following arguments: * `U_collect_state`: The name of the user-supplied routine that initializes a state vector from the array holding the ensemble of model states from the model fields. This is basically the inverse operation to `U_distribute_state` used in `PDAF_get_state` as well as here. * `U_init_dim_obs_pdafomi`: The name of the user-supplied routine that initializes the observation information and provides the size of observation vector * `U_obs_op_pdafomi`: The name of the user-supplied routine that acts as the observation operator on some state vector * `U_prepoststep`: The name of the pre/poststep routine as in `PDAF_get_state` * `U_localize_covar_pdafomi`: Apply covariance localization to the matrices HP and HPH^T^ * `status`: The integer status flag. It is zero, if `PDAFomi_assimilate_lenkf` is exited without errors. For the EnKF, the user-supplied routines are essentially executed in the order they are listed in the interface to PDAFomi_put_state_lenkf. The user-supplied call-back routines are described on the page on [ImplementAnalysislenkf implementing the analysis step of the local EnKF]. It is recommended that the value of `status_pdaf` is checked in the program after PDAFomi_put_state_lenkf is executed. Only if its value is 0 the initialization was successful. PDAF also has a [PdafSimplifiedInterface Simplified Interface] providing the routine [wiki:PDAFomi_put_state_lenkf_si PDAFomi_put_state_lenkf_si]. In the simplified interface, the name of the user-supplied routines have predefined names and do not appear in the call to `PDAFomi_put_state_lenkf_si`. More information on the pre-defined names is provided in the [ImplementAnalysisLocal page on implementing the analysis step of the local filters].