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Applied Optics

Applied Optics


  • Vol. 39, Iss. 9 — Mar. 20, 2000
  • pp: 1379–1381

Reduction of skylight reflection effects in the above-water measurement of diffuse marine reflectance: comment

Nickolay A. Krotkov and Alexander P. Vasilkov  »View Author Affiliations

Applied Optics, Vol. 39, Issue 9, pp. 1379-1381 (2000)

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Use of a vertical polarizer has been suggested to reduce the effects of surface reflection in the above-water measurements of marine reflectance. We suggest using a similar technique for airborne or spaceborne sensors when atmospheric scattering adds its own polarization signature to the upwelling radiance. Our own theoretical sensitivity study supports the recommendation of Fougnie et al. [Appl. Opt. 38, 3844 (1999)] (40–50° vertical angle and azimuth angle near 135°, polarizer parallel to the viewing plane) for above-water measurements. However, the optimal viewing directions (and the optimal orientation of the polarizer) change with altitude above the sea surface, solar angle, and atmospheric vertical optical structure. A polarization efficiency function is introduced, which shows the maximal possible polarization discrimination of the background radiation for an arbitrary altitude above the sea surface, viewing direction, and solar angle. Our comment is meant to encourage broader application of airborne and spaceborne polarization sensors in remote sensing of water and sea surface properties.

© 2000 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(120.5700) Instrumentation, measurement, and metrology : Reflection
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(240.0240) Optics at surfaces : Optics at surfaces
(260.5430) Physical optics : Polarization
(290.1310) Scattering : Atmospheric scattering

Original Manuscript: July 2, 1999
Revised Manuscript: January 5, 2000
Published: March 20, 2000

Nickolay A. Krotkov and Alexander P. Vasilkov, "Reduction of skylight reflection effects in the above-water measurement of diffuse marine reflectance: comment," Appl. Opt. 39, 1379-1381 (2000)

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