Low-power, lightweight, off-the-shelf imaging spectrometers, deployed
on above-water fixed platforms or on low-altitude aerial drones, have
significant potential for enabling fine-scale assessment of
radiometrically derived water quality properties (WQPs) in oceans,
lakes, and reservoirs. In such applications, it is essential that the
measured water-leaving spectral radiances be corrected for
surface-reflected light, i.e., glint. However, noise and spectral
characteristics of these imagers, and environmental sources of
fine-scale radiometric variability such as capillary waves, complicate
the glint correction problem. Despite having a low signal-to-noise
ratio, a representative lightweight imaging spectrometer provided
accurate radiometric estimates of chlorophyll concentration—an
informative WQP—from glint-corrected hyperspectral radiances in a
fixed-platform application in a coastal ocean region. Optimal glint
correction was provided by a spectral optimization algorithm, which
outperformed both a hardware solution utilizing a polarizer and a
subtractive algorithm incorporating the reflectance measured in the
near infrared. In the same coastal region, this spectral optimization
approach also provided the best glint correction for radiometric
estimates of backscatter at 650 nm, a WQP indicative of suspended
particle load.
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