ISS images from May 20 (Rev 216), show a half-phase Titan from a distance of 1.66 million kilometers (1.03 million miles). Under the colorful RGB atmosphere are surface features including eastern Xanadu, Hotei Arcus and the impact basin Menrva, visible in the CL1 CB3 filtered image.
Hotei Arcus and Hotei Regio have been the subject of intense study because the region is intrinsically interesting geomorphologically, having been imaged by ISS, VIMS and SAR. Some of the best work done coordinating these different imaging modalities appears right here in UMSF done by Mike Malaska. http://www.unmannedspaceflight.com/index.php?showtopic=5663
Professional interpretations of the images of the Hotei Arcus area provide fascinating reading. A summary of the findings (not sure this is the most recent consensus) is found here. http://saturn.jpl.nasa.gov/news/cassinisci...cience20100225/
The graphic below shows the enhanced Rev 216 images. ISS images taken from the enormously informative website Ciclops Looking Ahead http://www.ciclops.org/view/8057/Rev216?js=1 confirm what the raw images are showing and are used to superimpose VIMS and SAR imagery of the Hotei Regio area.
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