Changes between Version 4 and Version 5 of U_init_dim_obs_f


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Timestamp:
Feb 3, 2018, 8:12:59 PM (3 years ago)
Author:
lnerger
Comment:

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  • U_init_dim_obs_f

    v4 v5  
    1616
    1717Some hints:
    18  * It can be useful to not only determine the size of the observation vector at this point. One can also already gather information about the location of the observations, which can be used later, e.g. to implement the observation operator. In addition, one can already prepare an array that holds the full observation vector. This can be used later by `U_init_obs_l` to initialize a local vector of observations by selecting the relevant parts of the full observation vector. The required arrays can be defined in a module like `mod_assimilation`.
    19  * The routine is similar to `U_init_dim_obs` used in the global filters. However, if the global filter is used with a domain-decomposed model, it only initializes the size of the observation vector for the local model sub-domain. This is different for the local filters, as the local analysis also requires observational data from neighboring model sub-domains. Nonetheless, one can base on an implemented routine `U_init_dim_obs` to implement `U_init_dim_obs_f`.
    20  * To obtain the full observation dimension one can use the routine [wiki:PDAF_gather_dim_obs_f PDAF_gather_dim_obs_f] (introduced with PDAF 1.13).
    21  * To obtain the full observation vector and full observation coordinates one can use the routines [wiki:PDAF_gather_obs_f PDAF_gather_obs_f] and [wiki:PDAF_gather_obs_f PDAF_gather_obs_f2], respectively (introduced with PDAF_1.13)
     18 * The full observation vector dimension `dim_obs_f` can be obtained by first counting process-local observation and then using the routine [wiki:PDAF_gather_dim_obs_f] (introduced with PDAF_V1.13).
     19 * It can be useful to not only determine the size of the observation vector at this point. One can also already gather information about the location (coordinates) of the observations, which can be used later, e.g. to implement the observation operator. In addition, one can already prepare an array that holds the full observation vector. This can be used later by `init_obs_l_pdaf` to initialize a local vector of observations by selecting the relevant parts of the full observation vector. The required arrays can be defined in a module like `mod_assimilation`.
     20 * The full observation vector and an associated array of coorinates can be collected using the routines [wiki:PDAF_gather_obs_f] and [wiki:PDAF_gather_obs_f2] (introduced with PDAF V1.13).
     21 * The routine is similar to `init_dim_obs_pdaf` used in the global filters. However, if the global filter is used with a domain-decomposed model, it only initializes the size of the observation vector for the local model sub-domain. This is different for the local filters, as the local analysis also requires observational data from neighboring model sub-domains. Nonetheless, one can base on an implemented routine `init_dim_obs_pdaf` to implement `init_dim_obs_f_pdaf`.
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