How many spectral bands are necessary to describe the directional reflectance of beach sands?

Katarina Z. Doctor; Steven G. Ackleson; Charles M. Bachmann; Deric J. Gray; Marcos J. Montes; Robert A. Fusina; Paul R. Houser

doi:10.1117/12.2222221

17 May 2016 How many spectral bands are necessary to describe the directional reflectance of beach sands?

Katarina Z. Doctor, Steven G. Ackleson, Charles M. Bachmann, Deric J. Gray, Marcos J. Montes, Robert A. Fusina, Paul R. Houser

Author Affiliations +

Proceedings Volume 9840, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXII; 98401I (2016) https://doi.org/10.1117/12.2222221
Event: SPIE Defense + Security, 2016, Baltimore, MD, United States

Abstract

Spectral variability in the visible, near-infrared and shortwave directional reﬂectance factor of beach sands and freshwater sheet ﬂow is examined using principal component and correlation matrix analysis of in situ measurements. In previous work we concluded that the hyperspectral bidirectional reﬂectance distribution function (BRDF) of beach sands in the absence of sheet ﬂow exhibit weak spectral variability, the majority of which can be described with three broad spectral bands with wavelength ranges of 350-450 nm, 700-1350 nm, and 1450-2400 nm.¹ Observing sheet ﬂow on sand we ﬁnd that a thin layer of water enhances reﬂectance in the specular direction at all wavelengths and that spectral variability may be described using four spectral band regions of 350-450 nm, 500-950 nm, 950-1350 nm, and 1450-2400 nm. Spectral variations are more evident in sand surfaces of greater visual roughness than in smooth surfaces, regardless of sheet ﬂow.

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Katarina Z. Doctor, Steven G. Ackleson, Charles M. Bachmann, Deric J. Gray, Marcos J. Montes, Robert A. Fusina, and Paul R. Houser "How many spectral bands are necessary to describe the directional reflectance of beach sands?", Proc. SPIE 9840, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XXII, 98401I (17 May 2016); https://doi.org/10.1117/12.2222221

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