Fig. 1. Flow chart of comparison between HIRAS-II and MERSI-LL on same platform

Fig. 2. HIRAS-II spectrum and SRF of each channel in MERSI-LL

Fig. 3. RMSE varying with number of MERSI-LL shifted pixels along track and across track

Fig. 4. Number of shifted pixels of MERSI-LL image for best match between HIRAS-II and MERSI-LL at each channel. (a) Along-track direction; (b) across-track direction

Fig. 5. Comparison results of each channel between HIRAS-II and MERSI-LL. (a) 4.05 μm channel; (b) 7.20 μm channel; (c) 8.55 μm channel; (d) 10.80 μm channel; (e) 12.00 μm channel

Fig. 6. Mean BT bias of each channel between HIRAS-II and MERSI-LL varying with BT of HIRAS-II

Fig. 7. Bias of each channel between HIRAS-II and MERSI-LL in Pacific and Arctic varying with mean BT of HIRAS-II spectrum and scan angle. (a)(c) Bias varying with mean BT of HIRAS-II spectrum; (b)(d) mean bias varying with scan angle of HIRAS-II

Fig. 8. Long-time series distribution of BT bias of each channel of HIRAS-II and MERSI-LL. (a) 4.05 μm channel; (b) 7.20 μm channel; (c) 8.55 μm channel; (d) 10.80 μm channel; (e) 12.00 μm channel