Changes between Version 12 and Version 13 of OMI_observation_modules


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Timestamp:
Nov 25, 2020, 10:36:47 AM (6 months ago)
Author:
lnerger
Comment:

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  • OMI_observation_modules

    v12 v13  
    254254=== `thisobs%use_global_obs` ===
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     256In the domain-localized filters (LESTK, LETKF, LSEIK, LNETF) observations are assimilated that are located within the localization around some grid point. When a model uses parallelization with domain-decomposition some of these observations might belong to a different process-domain. In th e default mode (`thisobs%use_global_obs`=1) PDAF-OMI gather all globally available observations so that each process has access to all observations. It can be more efficient to restrict the observations on a process-domain to those observations that are located inside the domain or within the localization radius arond it. Then, in the local analyses a smaller number of observation have to be checked for their distance. Setting `thisobs%use_global_obs=0` actiavates this feature. However, it needs additional preparations to make PDAF-OMI aware of the limiting coordinates of a process sub-domain. The use of this feature is described in the [wiki:OMI_use_global_obs documentation on using restricted observations].
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