Journal
OPTICS EXPRESS
Volume 18, Issue 25, Pages 26313-26324Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.026313
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Funding
- Naval Research Laboratory
- Northern Gulf Institute
- NASA
- U. S. Office of Naval Research
- Korea Institute of Marine Science & Technology Promotion (KIMST) [20072003] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Using hyperspectral measurements made in the field, we show that the effective sea-surface reflectance rho (defined as the ratio of the surface-reflected radiance at the specular direction corresponding to the downwelling sky radiance from one direction) varies not only for different measurement scans, but also can differ by a factor of 8 between 400 nm and 800 nm for the same scan. This means that the derived water-leaving radiance (or remote-sensing reflectance) can be highly inaccurate if a spectrally constant rho value is applied (although errors can be reduced by carefully filtering measured raw data). To remove surface-reflected light in field measurements of remote sensing reflectance, a spectral optimization approach was applied, with results compared with those from remote-sensing models and from direct measurements. The agreement from different determinations suggests that reasonable results for remote sensing reflectance of clear blue water to turbid brown water are obtainable from above-surface measurements, even under conditions of high waves. (C)2010 Optical Society of America
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