Fig. 1. Quasi-synchronous image of floating Ulva prolifera macroalgae on 8 June 2019

Fig. 2. Quasi-synchronous MSI and MODIS standard false color images covering the Yellow Sea

Fig. 3. Optical extraction of floating algae in the Yellow Sea

Fig. 4. APR image with 250 m resolution simulated by MSI

Fig. 5. Statistics of MODIS detection results based on two pairs of quasi-synchronous images.

Fig. 6. Spatial distribution characteristics of low-aggregation green tide

Fig. 7. The uncertainty of MODIS data on the quantitative assessment of green tide