(a) (b) (c) (d) (e) (f) FIGURE 6. The data sets. (a) and (b) Toulouse data set, (c) and (d) Collazzone data set, and (e) and (f) NY data set. The first column contains the MS images upsampled to the PAN scale, and the second column is about the PAN images. MARCH 2021 IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE 67