Fig. 2
Definition of Crossover Points. The left figure in Fig. (a) shows how crossover points are determined using ICESat-2 data from two different times, represented by blue and orange points. The right figure of Fig. (a) shows the determination criterion for the crossover points and the definition of the elevation difference. Fig. (b) is a schematic representation of ICESat-2 crossover points determined by different tracks. The solid blue and yellow lines represent the two ICESat-2 tracks, Time1 and Time2 indicate the acquisition times, and the dashed circles indicate the laser footprints.
