Anderson, K., Milton, E.J. and Rollin, E.M.
Sources of uncertainty in vicarious calibration: understanding calibration target reflectance.
IGARSS '03 Proceedings of the International Geoscience and Remote Sensing Symposium, 21-25 July 2003, Toulouse, France.
IGARSS '03 Proceedings of the International Geoscience and Remote Sensing Symposium
Institute of Electrical and Electronics Engineers (IEEE).
A field experiment investigated the hypothesis that the nadir reflectance of calibration surface substrates (asphalt and concrete) remains stable over a range of time-scales. Measurable differences in spectral reflectance factors were found over periods as short as 30 minutes. Multi-date reflectance measurements were compared using ANOVA and found to differ significantly (p = 0.001). Surface reflectance showed a relationship with the relative proportion of diffuse irradiance,
over periods when solar zenith changes were minimal. These findings illustrate the anisotropic nature of calibration surfaces, and place emphasis on the need for collection of diffuse and global irradiance measurements at the time of remotely-sensed data acquisition.
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