Item talk:Q241167
From geokb
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"name": "Titan's surface from Cassini RADAR SAR and high resolution radiometry data of the first five flybys",
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"abstract": "The first five\u00a0Titan\u00a0flybys with Cassini's\u00a0Synthetic Aperture\u00a0RADAR (SAR) and\u00a0radiometer\u00a0are examined with emphasis on the calibration and interpretation of the\u00a0high-resolution\u00a0radiometry data acquired during the\u00a0SAR\u00a0mode (SAR-radiometry). Maps of the 2-cm wavelength\u00a0brightness temperature\u00a0are obtained coincident with the SAR swath imaging, with\u00a0spatial resolution approaching 6 km. A preliminary calibration shows that brightness temperature in these maps varies from 64 to 89 K. Surface features and physical properties derived from the SAR-radiometry maps and SAR imaging are strongly correlated; in general, we find that surface features with high radar\u00a0reflectivity\u00a0are associated with radiometrically cold regions, while surface features with low radar reflectivity correlate with radiometrically warm regions. We examined scatterplots of the normalized\u00a0radar cross-section\u00a0\u03c30\u00a0versus brightness temperature, finding differing signatures that characterize various terrains and surface features. Implications for the physical and compositional properties of these features are discussed. The results indicate that volume scattering is important in many areas of Titan's surface, particularly Xanadu, while other areas exhibit complex brightness temperature variations consistent with variable slopes or surface material and compositional properties.",
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