Global map of Titan's surface showing the coverage derived from Synthetic Aperture Radar (SAR) and High Altitude Synthetic Aperture Radar (HiSAR) images. This mosaic merges Cassini swaths through flyby T104 into a single mosaic. This is a preliminary product. The Cassini Titan Radio Detection and Ranging (RADAR) Mapper plays a significant role in investigating the surface of Titan. This multi-mode radar instrument operates in the 13.8 GHz Ku-band (or 2.2 cm wavelength) and is designed to probe the optically inaccessible surface of Titan. The four different modes of the instrument Synthetic Aperture Radar (SAR) imaging, Altimetry, Scatterometry and Radiometry allow surface imaging as well as topographic mapping at spacecraft altitudes between 100,000 km and about 1,000 km, with resolutions for the modes ranging from 100 s of km to a few hundred meters (Elachi et al. 2005) . The observations, particularly when performed in the active modes of SAR, altimetry and scatterometry, are largely unaffected by atmospheric contributions.