Estimation of the water optical properties and bottom reflectance from SHOALS data

V. I. Feygels; Y. Kopilevich; G. H. Tuell; A. Surkov; P. LaRocque; A. G. Cunningham

doi:10.1117/12.740462

13 April 2007 Estimation of the water optical properties and bottom reflectance from SHOALS data

V. I. Feygels, Y. Kopilevich, G. H. Tuell, A. Surkov, P. LaRocque, A. G. Cunningham

Proceedings Volume 6615, Current Research on Remote Sensing, Laser Probing, and Imagery in Natural Waters; 66150F (2007) https://doi.org/10.1117/12.740462
Event: Current Research on Remote Sensing, Laser Probing, and Imagery in Natural Waters, 2007, Moscow, Russian Federation

Abstract

In earlier work, we have proposed a concept for estimation of ocean optical properties with a mutliple field of view bathymetric lidar. In this paper we consider and implementation of this idea using the Scanning Hydrographic Operational Airborne Lidar Survey (SHOALS) system. The SHOALS design uses two receivers for depth measurement: a shallow-water, APD receiver with and 18 mrad FOV; and a deep-water PMT receiver with a 40 mrad FOV. They simultaneously record the optical power returned from a single pulse of the laser, and consequently provide the desired measurements. Here, we present an algorithm for the estimation of inherent optical properties (IOPs) in the upper ocean layer which is based on "multiple-forward-single-backscattering" model of the returned power, and an analytical solution to the radiative transfer equation (RTE) for finite sounding beam propogation in the small-angle-scattering approximation. Using this algorithm, we have developed an approach for estimation of the backscattering coefficient, the beam attenuation coefficient, the single-scattering albedo, and the VSF asymmetry coefficient, by fitting simulated waveforms to actual data measured by the two receivers. We also present an approach for improvement in estimates of bottom reflectance which compensates for pulse stretching induced by angle of incidence effects.

Citation Download Citation

V. I. Feygels, Y. Kopilevich, G. H. Tuell, A. Surkov, P. LaRocque, and A. G. Cunningham "Estimation of the water optical properties and bottom reflectance from SHOALS data", Proc. SPIE 6615, Current Research on Remote Sensing, Laser Probing, and Imagery in Natural Waters, 66150F (13 April 2007); https://doi.org/10.1117/12.740462

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