Changes between Version 2 and Version 3 of OMI_observation_operators


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Timestamp:
Nov 23, 2020, 5:44:36 PM (6 months ago)
Author:
lnerger
Comment:

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  • OMI_observation_operators

    v2 v3  
    107107 - The order of the grid points in `gcoords` has to be consistent with the order of the indices specified in `thisobs%id_obs_p`
    108108
    109 I
     109
     110== Implementing your own observation operator ==
     111
     112The current set of observation operators provided by PDAF-OMI is rather fundamental. However, there are also observation types which are not variables of state vector, but functions of several values. Likewise one might want to use a more sophisticated interpolation than the linear one or some interpolation that treats the horizontal and vertical directions separately. For these cases you can implement you own operators.
     113
     114The PDAF-package provides a template to implement new observation operators in `templates/omi/obs_op_pdafomi_TEMPLATE.F90`.
     115
     116Each observation operator include the following functionality:
     117 - Check whether `thisobs%doassim==1`, which indicates that the observation is assimilated
     118 - initialize the observation vector `ostate_p` for the observation TYPE for which the routine is called. For a parallel model this is done for for the process-local domain (for a model without parallelization this is the global domain)
     119 - Call `PDAFomi_gather_obsstate` to gather the full observation vector `obs_f_all`. This call is mandatory even if theh model is not parallelized.
     120
     121