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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 36 — Dec. 20, 1999
  • pp: 7442–7455

Estimation of the remote-sensing reflectance from above-surface measurements

Curtis D. Mobley  »View Author Affiliations


Applied Optics, Vol. 38, Issue 36, pp. 7442-7455 (1999)
http://dx.doi.org/10.1364/AO.38.007442


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Abstract

The remote-sensing reflectance Rrs is not directly measurable, and various methodologies have been employed in its estimation. I review the radiative transfer foundations of several commonly used methods for estimating Rrs, and errors associated with estimating Rrs by removal of surface-reflected sky radiance are evaluated using the Hydrolight radiative transfer numerical model. The dependence of the sea surface reflectance factor ρ, which is not an inherent optical property of the surface, on sky conditions, wind speed, solar zenith angle, and viewing geometry is examined. If ρ is not estimated accurately, significant errors can occur in the estimated Rrs for near-zenith Sun positions and for high wind speeds, both of which can give considerable Sun glitter effects. The numerical simulations suggest that a viewing direction of 40 deg from the nadir and 135 deg from the Sun is a reasonable compromise among conflicting requirements. For this viewing direction, a value of ρ ≈ 0.028 is acceptable only for wind speeds less than 5 m s-1. For higher wind speeds, curves are presented for the determination of ρ as a function of solar zenith angle and wind speed. If the sky is overcast, a value of ρ ≈ 0.028 is used at all wind speeds.

© 1999 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(030.5620) Coherence and statistical optics : Radiative transfer
(120.5700) Instrumentation, measurement, and metrology : Reflection
(280.0280) Remote sensing and sensors : Remote sensing and sensors

History
Original Manuscript: April 19, 1999
Revised Manuscript: September 1, 1999
Published: December 20, 1999

Citation
Curtis D. Mobley, "Estimation of the remote-sensing reflectance from above-surface measurements," Appl. Opt. 38, 7442-7455 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-36-7442

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