Fig. 1. RGB images of strong convective cloud clusters and non-precipitation cloud clusters. (a) Strong convective cloud clusters; (b) non-precipitation cloud clusters

Fig. 2. Schematic diagram of scattering geometric relation

Fig. 3. Strong convective cloud clusters over central and eastern China on July 4, 2018. (a) RGB image; (b) cloud phase distribution image; (c) polarization reflectance varying with scattering angle

Fig. 4. Strong convective cloud clusters over central and eastern China on July 26, 2018. (a) RGB image; (b) cloud phase distribution image; (c) polarization angle distribution image of 490 nm band

Fig. 5. Typhoon cloud clusters over Atlantic on June 11, 2018. (a) RGB image; (b) cloud phase distribution image; (c) polarization angle distribution image of 490 nm band

Fig. 6. Non-precipitation cloud clusters over central and eastern China on May 28, 2018. (a) RGB image; (b) cloud phase distribution image; (c) polarization reflectance varying with scattering angle

Fig. 7. Illumination, observation conditions and physical quantities of strong convective cloud clusters on July 4, 2018, non-precipitation cloud clusters on May 28, 2018 and difference value between them in polarization band varying with order of observation angle. (a1)--(a3) Solar zenith angle; (b1)--(b3) observation zenith angle; (c1)--(c3) scattering angle; (d1)--(d3) polarization reflectance; (e1)--(e3) polarization angle

Fig. 8. Comparison of non-precipitation cloud cluster and strong convective cloud cluster images. (a) Polarization angle image of non-precipitation cloud clusters on July 4, 2018; (b) polarization angle image of strong convective cloud clusters on May 28, 2018

Table 1. Main technical parameters of DPC

Table 2. Mean reflectances of strong convective cloud clusters and non-precipitation cloud clusters varying with central wavelengths