Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3606f&link_type=abstract
American Astronomical Society, DPS meeting #41, #36.06
Astronomy and Astrophysics
Astronomy
Scientific paper
Since October 2004, the Cassini spacecraft has made numerous close passes of Titan. SAR image products (BIDR) have been released from 22 encounters, and altimetry products (ABDR) from 17. In the present work, we reprocess the raw altimetry data products (LBDR) using algorithms originally developed for the Magellan altimeter at Venus, to reduce the effective size of the radar footprint, generating along-track topographic profiles that are several times higher resolution without sacrificing vertical accuracy. The highest resolution, 550 m, is obtained in the periapsis region of the T30 encounter (05/12/2007), where the beam track had been chosen to lie along the SAR swath imaged on the T28 encounter (04/10/07). Most near-periapsis features in the SAR image, even the faintest, are found to have a topographic expression of tens to hundreds of meters, while many featureless regions appear flat to ±10 m over tens of km. This work was supported by a grant from the Cassini 2008 Data Analysis Program.
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