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Abstract
We measure the Bi-directional reflectance distribution function (BRDF) of ooid sand layers with three particle size distributions (0.5-1mm, 0.25-0.5mm and 0.125-0.25mm) and layer thicknesses on a reflecting mirror to determine the influential depth in the optical region at wavelengths of 658 nm (red), 570 nm (green) and 457 nm (blue). The hemispherical reflectance (albedo) was used as an indicator of BRDF changes between different layers. Measurements are carried out on both dry and water wetted grains. The results indicate that for both dry and wet and all size distributions, the influential depth is at most 2mm.
Highlights
The Bi-directional reflectance distribution function (BRDF) is defined as the ratio of the radiance scattered by a surface into a given direction to the collimated power incident on a
The BRDF is the fundamental parameter needed to accurately predict how light is reflected from a surface. In both active and passive remote sensing, it is a critical parameter in determining the received signal. It is an important parameter for radiative transfer modeling of the light field in shallow water
To determine the depth which influences the BRDF, we have carried out laboratory BRDF measurements, embedding a reflective mirror at different depths in an ooid sand sediment
Summary
The Bi-directional reflectance distribution function (BRDF) is defined as the ratio of the radiance scattered by a surface into a given direction to the collimated power incident on a. The BRDF is the fundamental parameter needed to accurately predict how light is reflected from a surface In both active and passive remote sensing, it is a critical parameter in determining the received signal. To determine the depth which influences the BRDF, we have carried out laboratory BRDF measurements, embedding a reflective mirror at different depths in an ooid sand sediment. The lamellar carbonate coatings of these ooid grains were formed in high-energy tidal channels and provided a highly reflective, lustrous surface for BRDF measurements [4]. The measurements shown here are not in situ and the sample preparation processes has eliminated possible effects such as organic coatings and absorbing medium, the results may still allow us to determine the influential depth in a natural sediment. After the wet measurements were done, the sample surface was checked with the edge of a ruler to make sure the sample thickness remained constant during the measurements
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