Four-dimensional local ensemble transform Kalman filter:

filter 4d You 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. A filter effect consists of a succession of graphic operations, applied to a source graphic, which produces a modified graphic. The result of the filter effect is rendered on the target device in

filter77, We present a four-dimensional ensemble Kalman filter (4D-LETKF) that approximately and efficiently solves a variational problem similar to that solved by 4D-VAR,.