Fig. 1. Aerial view of Songshan Remote Sensing Calibration Field

Fig. 2. Model (a) and picture (b) of automated reflectance monitoring spectrometer

Fig. 3. Model (a) and picture (b) of visible-shortwave infrared hyperspectral irradiance meter

Fig. 4. Verification process of the reflectance accuracy

Fig. 5. Measurement comparison of two methods in Area Ⅰ. (a) Comparison of two reflectance; (b) measurement deviation

Fig. 6. Measurement comparison of two methods in Area Ⅱ. (a) Comparison of two reflectance; (b) measurement deviation

Fig. 7. Measurement comparison of two methods in Area Ⅲ. (a) Comparison of two reflectance; (b) measurement deviation

Fig. 8. All day total irradiance in different bands measured by HIM-002 on October 29, 2019

Fig. 9. All day total-irradiance of HIM-002 in different bands. (a) June 3, 2020; (b) July 27, 2020

Fig. 10. Target reflected radiance data measured by ARM002 at different time

Fig. 11. The changes of reflectance in the Area Ⅱ. (a) In the whole bands; (b) some wavelengths

Fig. 12. The changes of reflectance in the Area Ⅲ. (a) In the whole bands; (b) some wavelengths

Fig. 13. The standard deviation of reflectance in the field. (a) Area Ⅱ; (b) Area Ⅲ