Abstract
Road pavement reflectance is usually assumed to be invariant in short periods
of time in some quantitative remote sensing applications. To examine its
variability, reflectance sequences of concrete and asphalt pavement are measured in
field for half a day in visible and near-infarecd (VNIR) spectral range using
dual-beam method. As much as 20.7% and 3.52% of relative changes are found in
asphalt and concrete reflectance data at 550 nm, and all VNIR bands demonstrate
similar variations found to correlate with both illumination geometry and the
relative portion of diffuse irradiance. In this letter, this effect is interpreted
from a mathematic view. Further studies are needed to model the dynamics of
reflectance physically.
© 2012 Chinese Optics Letters
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