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Instrument: C-SAR : C-Band Synthetic Aperture Radar
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SAR systems use multiple looks along the flight direction to
improve the resolution by using the RADAR return Doppler shift
at each position. RADAR return strength is dependent on the
surface roughness relative to the wavelength and the electrical
characteristics (dielectric constant, which is the electrical
energy that is stored, absorbed, and conducted by the
surface). C-Band wavelengths are about 3-8 cm.

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[Summary provided by NASA]