Fig. 1. Distribution of global ocean calibration field and quasi-invariant desert calibration field in North Africa and Arabian Peninsula

Fig. 2. Comparison of spectral response function between POSP and DPC onboard GF-5(02)

Fig. 3. Scatter plot of simulated and measured apparent reflectance values during Rayleigh scattering calibration in January 2022 for DPC/GF-5(02). (a) 443 nm; (b) 490 nm; (c) 565 nm; (d) 670 nm

Fig. 4. Scatter plot of measured apparent reflectance of DPC and POSP on GF-5(02) for "polarization crossfire" cross calibration. (a) 443 nm; (b) 490 nm; (c) 670 nm; (d) 865 nm.

Fig. 5. Relative radiometric calibration results of DPC/GF-5(02) based on Rayleigh scattering in January 2022.(a) 443 nm; (b) 490 nm; (c) 565 nm; (d) 670 nm

Fig. 6. Relative radiometric calibration results of DPC/GF-5(02) based on "polarization crossfire" cross radiation calibration.(a) 443 nm; (b) 490 nm; (c) 670 nm; (d) 865nm

Fig. 7. Relative radiometric calibration results of DPC/GF-5 based on Rayleigh scattering in June 2018.(a) 443 nm；(b) 490 nm；(c) 565 nm；(d) 670 nm