Kraken Mare through polarisers, Cassini looks for lake shine |
Kraken Mare through polarisers, Cassini looks for lake shine |
Mar 29 2009, 08:56 AM
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
The latest 'looking ahead' gives a nice description of the pi-transfer, introducing the curious concept of a 'rev' that is only half a revolution. It also contains this sentence:
"With Kraken Mare near the field of view, scientists can also use this effort to see how using polarization filters affects the appearance of large bodies of liquid methane on Titan." Titan followers here may remember why I'm excited about that. http://www.unmannedspaceflight.com/uploads...78901_thumb.jpg |
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Oct 29 2014, 09:12 PM
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
On visual inspection I can't say I recognise lake outlines there, but that's not too surprising given that the filters chosen for those images were optimised for atmospheric study rather than for surface features. Also the image orientation was rather unfortunate, putting most of the lake surfaces near 45 degrees from each polariser. But I'm thrilled that somebody has finally had a go at this, so thank you very much!! I will continue to look for suitable image pairs for this treatment. (There are a few further up the thread that might be worth a try.)
I would like to know one thing about the subtraction process you used. Does it preserve the sign of the differences or just their magnitudes? That would greatly affect what I'd be looking for in any future attempts. |
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