= Porting an Existing Implementation to OMI = {{{ #!html

PDAF-OMI Guide

  1. Overview
  2. callback_obs_pdafomi.F90
  3. Observation Modules
  4. Observation Operators
  5. Debugging functionality
  6. Implementing the analysis step with OMI
    1. Implementation for Global Filters
    2. Implementation for Local Filters
    3. Implementation for LEnKF
  7. Porting an existing implemention to OMI
}}} If you have an implementation of the data assimilation with PDAF without OMI, you can port it to OMI with the following steps: 1. Install the current PDAF version which includes the OMI functionality (V1.16 or later) 1. In mod_assimilation declare an array `coords_l` for the coordinates of the local analysis domain. Then fill `coords_l` in `init_dim_l_pdaf`. These coordinates are later used in `init_dim_obs_l_pdafomi`. 1. Copy the template file `callback_obs_pdafomi.F90` to your code directory. 1. In `assimilate_pdaf` replace the call(s) to PDAF_put_state_X or PDAF_assimilate_X by the calls to PDAFomi_put_state_local/global or PDAFomi_assimilate_local/global (You can copy this from the template files in templates/) 1. In `assimilate_pdaf` further replace the declaration of the 'EXTERNAL' subroutines following the template (several of the routines are no longer present with PDAF-OMI, while those that remain now have the suffix `_pdafomi` (like init_dim_obs_pdafomi) 5. For each observation type implement an obs-module as described in the [wiki:OMI_observation_modules documention on the observation modules] 7. Add a call to `deallocate_obs_pdafomi()` are the end of your routine `prepoststep`. 8. Adapt the compilation to also compile `callback_obs_pdafomi.F90` and the obs-modules. 9. Modify the compilation such that the include-directory of your PDAF installation is defined as an include directory (i.e. specify -IPDAF_ROOT/include where PDAF_ROOT is the root directory of your PDAF installation.)