Zhiwei XIA, Shuo WANG, Xiaolong YI, Yupeng WANG, Wei FANG. Method for unattended measurement of surface reflectance in field sites[J]. Optics and Precision Engineering, 2023, 31(16): 2319
- Optics and Precision Engineering
- Vol. 31, Issue 16, 2319 (2023)
Fig. 1. Composition of the automatic surface reflectance monitor
Fig. 2. Pictures of automatic surface reflectance monitor installation
Fig. 3. Composition of automatic diffuse-to-global irradiance ratios monitor
Fig. 4. Pictures of automatic diffuse-to-global irradiance ratios monitor installation
Fig. 5. Diagram of the standard whiteboard reflectance
Fig. 6. Annual variation curve of noon solar elevation angle in Dunhuang
Fig. 7. Lambert correction coefficients at different solar elevation angles
Fig. 8. Measured reflectance of the field by whiteboard method （Day 1， E i=27.94°， A z=183.72°）
Fig. 9. Reflectance coefficient of irradiance method
Fig. 10. Relative uncertainty of spectral measurement module
Fig. 11. Measured reflectance of field by whiteboard method
Fig. 12. Difference comparison of surface reflectance
Fig. 13. Measured reflectance of field by irradiance method
Fig. 14. Difference comparison of surface reflectance
Fig. 15. Measured reflectance of field by whiteboard method
Fig. 16. Difference comparison of surface reflectance
Fig. 17. Measured reflectance of field by irradiance method
Fig. 18. Difference comparison of surface reflectance
Fig. 19. Difference comparison of surface reflectance
Fig. 20. Surface reflectance correction
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Table 1. Specifications of the automatic surface reflectance monitor
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Table 2. Specifications of automatic diffuse-to-global irradiance ratios monitor
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Table 3. Uncertainty of the coefficient of irradiance method
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Table 4. Uncertainty of reflectance measurement
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