Context Navigation

Changes between Version 16 and Version 17 of OMI_observation_modules_PDAF3

v16	v17
193	193	- 2D+1D factorized non-isotropic localization: With PDAF V2.2.1 a factorized 2D+1D localization can be specified (see [wiki:OMI_observation_modules#thisobsdisttype explanation of disttype]. If the non-isotropic localization is used one can specify different weight functions for the vertical and horizontal directions. This is achieved by declaring `loweight` as a vector of size 2. Now the first element specifies the weight function (according to the table above) for the horizontal direction and the second element specified the wieght function for the vertical direction. When 'locweight' is used as a scalar variable, it specified the weight function in the horizontal direction while the weight function in the vertical dircetion is a constant value of one.
194	194	- A common choice is to use `locweight=2` or `locweight=4` in combination with `cradius=sradius`. Choosing `sradius>cradius` is possible, but `sradius<cradius` should be avoided (one would set the weights of distant observation to zero, but would still assimilate them).
	195	- optimizing the search operation: With PDAF V3.1 and later one can optimize the performance of the local search operation in `PDAFomi_init_dim_obs_l` by using the routine [wiki:PDAFomi_set_searchtype]. The speed of the search operation depends on different factors and this routine allows to switch the type of the search operation which can improve the speed.
195	196
196	197	== Routine for backward compatibility ==