FILTER 4DAn adjoint-free four-dimensional variational data

filter 4dA four-dimension (4D) bidirectional dital filter, having a minimum number of delay elements, is presented. This filter, besides having a minimum number of delay elements, also has anYou most often create filters and formats in pairs — one for the entry filter and the other for the display format. To create a custom format or filter: Select Tool Box > Filters and Formats in