Laboratory and field measurements of the modification of radar backscatter by sand

Mid-Pliocene shorelines of the US Atlantic Coastal Plain — An improved elevation database with comparison to Earth model predictions

“…2e, f). Under HV polarization (which better captures lithological contrasts; Williams and Greeley, 2004;Won and Ryu, 2002), the sandier substrate typical of the Pliocene marine terrace has lower signal amplitude and is represented by darker pixels than most lithologic substrates. By contrast, the more highly weathered and clayey forested areas appear bright in the SAR image.…”

Measurements of dielectric loss factors due to a Martian dust analog

“…Because sand deposits are also widespread on Mars, it is worthwhile to compare the values in Table 1 to dielectric properties of clean sand [ Williams and Greeley , 2001, 2004] and sand and alluvium from Egypt [ Schaber et al , 1986] (Table 2). Although these materials might not be ideal analogs for Mars, they were extremely dry, as would be expected for Martian surface materials.…”

Assessing Radarsat-2 polarimetric SAR for mapping shoreline cleanup and assessment technique (SCAT) classes in the Canadian Arctic

“…This may also explain why more volume scattering was observed over this class compared to others like Smooth/Un-Vegetated Mudflat. Some authors have also observed significant attenuation over wet sand (Williams & Greely, 2001;Williams & Greeley, 2004), while others have also observed higher VV return over sand compared to HH and HV (Hugenholtz & van der Sanden, 2001), as was the case in this study. It is possible that this is due to greater sensitivity to Bragg scattering as a result of surface waves at these angles (Thompson et al, 1998;Pietroniro et al, 2005;Toyra et al, 2005).…”