Fig. 1. Spectral response function of WFV sensor

Fig. 2. DN value before normalization

Fig. 3. DN value after normalization

Fig. 4. DN value after excluding outliers

Fig. 5. Calibration coefficients before and after Kalman filtering

Fig. 6. WFV time series calibration results. (a) WFV1; (b) WFV2; (c) WFV3; (d) WFV4

Fig. 7. Calibration coefficients of each band of WFV1 sensor and calibration coefficients of CCRS. (a) Band1; (b) band2; (c) band3; (d) band4

Fig. 8. Relative error histograms between calibration coefficient of WFV sensor and calibration coefficient of CCRS. (a) WFV1; (b) WFV2; (c) WFV3; (d) WFV4

Fig. 9. Comparison between the calibration error of CCRS and the calibration error of this article. (a) WFV1; (b) WFV2; (c) WFV3; (d) WFV4