Fig. 1. (a) The coverage of GIIRS regional observation (Quote from National Satellite Meteorological Center http://img.nsmc.org.cn); (b) GIIRS rectangular detection units is arranged in 32×4 array

Fig. 2. The spectral distribution of the average NEdT of 128 detection units in different time periods. (a) June 1 to August 12, 2019; (b) August 13 to November 6, 2019; (c) November 7, 2019 to February 29, 2020 (The red line is the sensitivity index at the background temperature of 300 K)

Fig. 3. (a)-(f) The average NEdT variation of 716.3 cm⁻¹, 731.3 cm⁻¹, 900 cm⁻¹, 1908.1 cm⁻¹, 1725 cm⁻¹ and 1952.5 cm⁻¹ with 32×4 array in July 2020; (g)-(l) The average NEdT variation of corresponding channels with the rows of 32×4 array in July 2020

Fig. 4. (a)-(f) The average NEdT variation of 716.3 cm⁻¹, 731.3 cm⁻¹, 900 cm⁻¹, 1908.1 cm⁻¹, 1725 cm⁻¹ and 1952.5 cm⁻¹ with space in July 2020. On the right side is the average NEdT variation of the corresponding channel with latitude in July 2020

Fig. 4. [in Chinese]

Fig. 5. Bias (light blue line), the deviation standard of bias (purple line) and NEdT (dark blue line) of GIIRS clear point in July 2020 (dark green error bar represents the standard deviation of NEdT)

Fig. 6. The diurnal variation of bias, the deviation standard of bias and NEdT of (a) 716.3 cm⁻¹, (b) 900 cm⁻¹ , (c) 1908.1 cm⁻¹, (d) 1952.5 cm⁻¹ in July 2020

Fig. 7. [in Chinese]

Fig. 7. (a)-(d) The bias variation of 716.3 cm⁻¹, 900 cm⁻¹, 1908.1 cm⁻¹ and 1952.5 cm⁻¹ with 32×4 array in July 2020; (e)-(h) The bias variation of corresponding channels with the rows of 32×4 array in July 2020

Fig. 8. [in Chinese]

Fig. 8. The bias variation of (a) 716.3 cm⁻¹, (b) 900 cm⁻¹, (c) 1908.1 cm⁻¹ and (d) 1952.5 cm⁻¹ with space in July 2020. On the right side is the bias variation of the corresponding channel with latitude in July 2020

Fig. 9. The relationship between bias of 716.3 cm⁻¹ (red line), 900 cm⁻¹ (green line), 1908.1 cm⁻¹ (blue line) and 1952.5 cm⁻¹ (black line) and satellite zenith angle in July 2020 (the histogram in the figure is the number within every 2° zenith angle)