This product contains the trajectories of all grid points within an initial datatake over a time interval between time T_start + nT.  The last observations are added at T_start + nT=T_end.  For example, the start time T_start could be at fall freeze-up or at the spring-summer transition.  Here, 1/T is the frequency of product generation and n is an integer greater than or equal to 1. T_end is typically at the end of the season of ice tracking. These products contain the following information of Lagrangian cells (initially 10 km by 10 km) on the ice cover: 1) ice motion; 2) deformation; 3) ice age and thickness; and 4) backscatter histograms.