An update on the 4D-LETKF data assimilation system for

filter4dEuler Filter. Cinema 4D has stocked up in the never-ending fht against gimbal lock. In addition to the coordinate Order, Freeze All and the Quaternion Rotation option, it now has the EulerAbstract. The four-dimensional local ensemble transform Kalman filter (4D-LETKF) data assimilation system for the whole neutral atmosphere is updated to better represent