Fig. 1. Study area and Sentinel-2A acquired on November 4, 2020 (a), photos of cornresidue cover areas (b)

Fig. 2. Time-Sequence NDVI and NDRI change curves of corn planting areas in the study area in 2020
(a): Temporal NDVI variation curve; (b): NDRI variation curve during H-S2

Fig. 3. Flowchart of identification technology of corn residue cover area

Fig. 4. Spectral reflectance characteristics of different ground types (Sentinel-2A images on 4 November 2020)
(a): Corn stalk residue; (b): Rice stalk residue; (c): Water; (d): Woods

Fig. 5. Spectral reflectance characteristics of different crops (Sentinel-2A image on 22 July 2020)
(a): Corn; (b): Rice

Fig. 6. QT feature construction schematic diagram
(a): Blue wave heat map; (b): Single pixel time series data; (c): Time series data selection; (d): Quantile dataset

Fig. 7. Connected domain calibration schematic diagram
(a): Numerical diagram of calssification area;(b): Schematic diagram of connected domain of pixels

Fig. 8. Visualization results of classification based on different feature dataset
(a): The original sub-image 1_w; (b): The result of M1; (c): The result of M2; (d): The result of M3; (e): The result of M4; (f): The result of M5

Fig. 9. Combined with the connected domain calibration classification result 1
(a): The original sub-image 1_S; (b): The result of M5_1; (c): The result of M5; (d): The result of M6

Fig. 10. Combined with the classification result of connected domain calibration 2
(a): The original sub-image 2_S; (b): The original sub-image 2_W; (c): The result of M5_1; (d): The result of M5; (e): The result of M6

Fig. 11. Identification results of corn residuecover area
(a): The sub-image 1 of calssification result;(b): The sub-image 2 of calssification result