Changes between Version 54 and Version 55 of OMI_observation_modules

Timestamp:

Sep 20, 2024, 7:11:37 PM (18 hours ago)

Author:

lnerger

Comment:

--

OMI_observation_modules

@@ -313 +313 @@
 === `ivar_obs_p` ===
 
-The default mode of PDAF-OMI uses a diagonal observation error covariance matrix **R**. The observation error variances can vary. `ivar_obs_p` is used to specify the inverse observation error variances.
+The default mode of PDAF-OMI uses a **diagonal observation error covariance matrix R**. The observation error variances can vary. `ivar_obs_p` is used to specify the inverse observation error variances.
 This should be a vector of real values. It will be used as an argument to `PDAFomi_gather_obs`. The order of the entries has to be consistent in the arrays `thisobs%id_obs_p`, `obs_p`, `ivar_obs_p`, and `ocoord_p`.
+
+If **non-diagonal observation error covariance matrices** are used, which is supported from PDAF 2.3, `ivar_obs_p` still has to be allocated and initialized. However, since the handling of **R** is ddone in a call-back routine if **R** is non-diagonal, it is up to the user whether this information is used. For more information see the **[wiki:OMI_nondiagonal_observation_error_covariance_matrices page on using non-diagonal R-matrices with OMI]**.