Updated Titan Map |
Updated Titan Map |
Sep 9 2006, 09:46 PM
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#1
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
I'm looking for a recent map ot Titan. Steve Albers's page links to one done by Fridger Schrempp in April 2005. Cassini has done a dozen flybys since then. Does anyone know if an updated map has been released.
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Dec 30 2006, 11:16 PM
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#2
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Member Group: Members Posts: 204 Joined: 20-November 05 From: Mare Desiderii Member No.: 563 |
I've always been surprised that there aren't more amateur Titan ORS mosaics here. (I realise it's a bit of a challenge, but that doesn't usually stop you lot...)
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Jan 3 2007, 11:17 PM
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#3
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I've always been surprised that there aren't more amateur Titan ORS mosaics here. (I realise it's a bit of a challenge, but that doesn't usually stop you lot...) Yes, this is very surprising. In my case one reason is that all of my recent Cassini image processing has involved a huge map covering Saturn's entire southern hemisphere. See this thread, especially the message I posted there today. Surprisingly, there aren't a whole lot of people playing around any Cassini images that I can see. Titan would make a pretty hard target to work with, given no easy way to reduce atmospheric haze. You really need excellent flatfields and either you can brew your own ones (hard to do manually) or work with the not so good ones on the calibration volumes. There's a lot to be desired there, especially for the wide-angle camera flatfields which would make simple mosaics easier than taking a shot at high-res NAC footprints. Geometric reprojection would also be handy since the exposures are long and the flybys pretty fast. SPICE kernels in other words... One idea might be to reduce noise by reprojecting several images of the same (or roughly same) area into a simple cylindrical map containing their 'sum' (a similar idea to superresolution processing). However, this requires extremely accurate pointing information since there are no high contrast features to use as an accurate guide if the results of reprojecting two or more images don't exactly match. The Cassini index files (index.tab) contain viewing geometry information but when making the previously mentioned map of Saturn I got slightly more accurate results by using the SPICE kernels directly. |
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