MARCH 2021 1 0.5 0.5 0 0 (a) (e) IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN 3 2.5 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN 3 2.5 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN SAM 1.5 D_λ 1 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN ERGAS 2 QNR PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 PCA IHS Brovey BDSD GS GSA PRACS HPF SFIM Indusion ATWT AWLP ATWT_M2 ATWT_M3 MTF_GLP MTF_GLP_HPM_PP MTF_GLP_HPM MTF_GLP_CBD MSDCNN Q2n Index (c) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 D_S 3.5 3.5 2 1.5 (b) (d) (f) FIGURE 12. The experiment results based on the urban data set. (a)-(c) The results with the ERGAS, SAM, and Q2 n index, respectively, in the reduced-resolution experiment. (d)-(f) The results with Dm , Ds , and the QNR, respectively, in the full-resolution experiment. 39