2 -2 (a) 0.5 0.6 0.7 0.8 0.9 1 (d) (e) (b) 0.2 0.4 0.6 0.8 1 (f) FIGURE 10. (a) A simulated noise-free interferogram. (b) The reference unwrapped phase of (a). (c) The noise-polluted interferogram of (a) with a 0.85 coherence. (d) The residue distribution of (c). (e) The reference OPT-BC. (f) The branch cut obtained by BCNet with ((,(, wijw ij12 15=))) [26]. 810 820 830 840 (c) 0.2 0.4 0.6 0.8 1 2 -2 -2 2 850 900 950 (a) 850 900 950 (c) 10 20 -20 -10 (g) (h) (d) 10 20 -20 -10 (i) 850 900 950 (e) 10 20 -20 -10 (j) FIGURE 11. (a) A TanDEM-X interferogram. (b) The reference PU result of (a) obtained from SRTM DEM. (c) The PU result of (a) obtained by Goldstein's branch-cut algorithm. (d) The PU result of (a) obtained by MCF. (e) The PU result of (a) obtained by PUMA. (f) The PU result of (a) obtained by BCNet-PU. (g) The difference between (b) and (c). (h) The difference between (b) and (d). (i) The difference between (b) and (e). (j) The difference between (b) and (f) [26]. JUNE 2021 IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE 17 (b) 850 900 950 (f) 10 20 -20 -10 850 900 950