Remote sensing reflectance measured with and without a vertical polarizer

Zhongping Lee; Kendall L. Carder; Thomas G. Peacock; Robert G. Steward

doi:10.1117/12.266489

6 February 1997 Remote sensing reflectance measured with and without a vertical polarizer

Zhongping Lee, Kendall L. Carder, Thomas G. Peacock, Robert G. Steward

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266489
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Remote-sensing reflectance (R_rs ratio of the water- leaving radiance to the downwelling irradiance above the surface) with and without a vertical polarizer in front of the sensor were derived for measurements made at 90 degrees to the solar plane and in a direction 30 degrees to nadir. These measurements were carried out to see if a vertical polarizer mounted in front of a sensor would improve the R_rs results. For 28 pairs of measurements with chlorophyll- a concentrations ranging from 0.07 to 38 mg/m³, solar zenith angles from 18 degrees to 66 degrees, clear to cloudy skies, and for optically shallow and deep waters, there was no significant variation between the polarized and unpolarized R_rs values. Statistical comparisons of polarized to unpolarized results provided R² values of 0.987, 0.987, 0.994, and 0.999 with slopes 1.007, 1.005, 0.983 and 0.998 for wavelengths at 410, 440, 550 and 630 nm, respectively. These results suggest that although the underwater light field is partially polarized, a vertical polarizer in front of a sensor will provide close results to unpolarized sensor, if the measurements were made in a direction 90 degrees to the solar plane and 30 degrees to the nadir.

Citation Download Citation

Zhongping Lee, Kendall L. Carder, Thomas G. Peacock, and Robert G. Steward "Remote sensing reflectance measured with and without a vertical polarizer", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266489

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