[X] My Assistant

[Juramike]

Here is a mosaic of Xanadu that includes:

• Section of Oct 2007 Titan Map (PIA08399)
• T47 SE Xanadu - Hotei Arcus mosaic
• T13 SAR RADAR Swath (PIA08552)
• T3 SAR RADAR Swath (left part from VP's website)
• T20 SAR distant targeted look (also from VP's website)
• PIA10654 SAR image of tectonic ridges in NW Xanadu

Some of the higher latitude swaths were skewed slightly by myself to try to better fit the ISS projection. There are mismatches, particularly for the non-equatorial swaths. The resolution is approximately 6 km/pixel.

A higher resolution (ca. 1.4 km/pixel) jpeg can be downloaded here (WARNING: 7 Mb file)

This will be a handy basemap for Xanadu mosaics and the upcoming RADAR releases.

-Mike

[Juramike]

Here is a carefully coordinated blink animation of an enhanced VIMS image of a region in E Xanadu with the corresponding T13 SAR RADAR image overlayed on the T47 ISS Mosaic.
The VIMS image originally appeared in Figure 7 (specifically Figure 7b) from Barnes et al., JGR 112 (2007) E11006. "Near-infrared spectral mapping of Titan's mountains and channels". doi: 10.1029/2007JE002932 and is reproduced here with permission of the author. I increased the hue and saturation of the VIMS sections separately for effect.


(Animated GIF-click to animate)

There is a lot of stuff going on in here (indicated in static graphic below):

1) As originally mentioned in the Barnes et al., 2007 article, the VIMS bluer unit correlates to some of the RADAR bright tectonic ridges.
(Mabon Macula is the blue peak standing alone near the end of the T13 swath.)

2) From the image above (with the T47 SE Xanadu mosaic as the basemap), one can see that the bluer tectonic ridges form a series of concentric ridges (and valleys) that appear to bend around the entire Hotei Arcus structure located just to the S (the bright section at bottom center is the NE corner of Hotei Arcus)

3) Many (but not all) of the RADAR darker terrains (in this part of Xanadu) appear to correlate to a "yellower" VIMS unit. (From the Barnes et al. 2007 article, most of these terrains are similar to Equatorial bright, but the VIMS spectra are giving information on the "flavor" of the ices - the tectonic ridges are watery-icey flavored Equatorial bright, and the "yellower" VIMS unit is "more organic-icey flavored Equatorial bright.)

4) [a] At the upper corner of the indicated T13 swath, there is a circular form that looks very much like an infilled crater. (Radar bright rim, dark center, possible RADAR-brighter central peak, and at least two breaches in the walls). Unfortunately this area is just outside the VIMS imaged area. [b] However, one of the RADAR-darker flows to the E was imaged by VIMS and correlates to the "yellower" VIMS unit.

5) At the center of the VIMS imaged area, there is a RADAR darker area that appears to embay surrounding terrain. This area correlates to to the "yellower" VIMS unit.

6) The VIMS yellowish - RADAR darkish lobate embayment is not general. There is an arc-like feature (which also extends into the T47 ISS image) that has RADAR-darker sections that are yellow, but others that are VIMS "greenish". Some of the VIMS yellowish area at this feature correlates to the RADAR bright bounding ridges of the arc structure.

7) In general, many of the southern bounding ridges of the embaying valley material appear to be VIMS bluer ridges. (The center of the VIMS image shows an alternating pattern of blue ridges and yellowish valleys)

8) General observation: if the mountain shows RADAR "layover" it correlates to the VIMS bluer unit in this graphic.

9) (The VIMS blue area at the top right of the image that is RADAR dark is part of W Fensal)

(I did try to extend to ISS imagery, but I'm not yet confident enough in my coordination of the T47 mosaic images - the T46 images might be a bit easier to deal with. At this point I weakly suspect that the VIMS yellower unit correlates to a slightly brighter terrain in the ISS)

-Mike