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Galileo images and mosaics of Europa
tedstryk
post Aug 22 2005, 04:03 AM
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I have worked on sprucing up some global views of Europa from Galileo. There are a few more global views I hope to get to eventually. But the best two at nearly full phase benefited a lot.



[Moderator note: There are several more threads containing Galileo Europa images but they all contain several inactive image links. The main threads are:
http://www.unmannedspaceflight.com/index.php?showtopic=2016
http://www.unmannedspaceflight.com/index.php?showtopic=2174
http://www.unmannedspaceflight.com/index.php?showtopic=2222
http://www.unmannedspaceflight.com/index.php?showtopic=2082
http://www.unmannedspaceflight.com/index.php?showtopic=2142 ]


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deglr6328
post Aug 22 2005, 05:45 AM
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Wow, I do believe that bottom one is the most spectacular view I have ever seen of Europa. Well done! Is that one true color? Interesting to contrast it with what Voyager saw. huh.gif
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Bob Shaw
post Aug 22 2005, 10:00 AM
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Yup. Verrrrrry good!


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edstrick
post Aug 22 2005, 10:12 AM
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That Voyager view is the best color mosaic view, but the image quality of that version is poor. A bit fuzzy and with a bad color-cast.
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Decepticon
post Aug 22 2005, 12:23 PM
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biggrin.gif WooHoo! My favorite LittleMoon! I love Europa. smile.gif
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tedstryk
post Aug 22 2005, 12:41 PM
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QUOTE (edstrick @ Aug 22 2005, 10:12 AM)
That Voyager view is the best color mosaic view, but the image quality of that version is poor.  A bit fuzzy and with a bad color-cast.
*

In my galileo mosaic, the color data is a mixture of two band data from the orbit, as well as a crude reprojection of data from other orbits. So the Voyager mosaic is best.


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tedstryk
post Aug 22 2005, 12:44 PM
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QUOTE (edstrick @ Aug 22 2005, 10:12 AM)
That Voyager view is the best color mosaic view, but the image quality of that version is poor.  A bit fuzzy and with a bad color-cast.
*

In my galileo mosaic, the color data is a mixture of two band data from the orbit, as well as a crude reprojection of data from other orbits. So the Voyager mosaic is best.

I think the super-res effect really helped them.


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tedstryk
post Aug 22 2005, 02:40 PM
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QUOTE (tedstryk @ Aug 22 2005, 12:44 PM)
In my galileo mosaic, the color data is a mixture of two band data from the orbit, as well as a crude reprojection of data from other orbits.  So the Voyager mosaic is best.

I think the super-res effect really helped them.
*



I am also working with Voyager...Here is the best Voyager 1 set, in OGB color.



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tedstryk
post Aug 22 2005, 03:25 PM
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I have worked a bit more....I am having OGB Voyager problems. To the right is the image as produced through standard processing. To the left is a version edited to try to look more like a Galileo image.



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tedstryk
post Aug 22 2005, 05:29 PM
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I just made an exciting "discovery" - well, a discovery to me...there is one more global color view in the Galileo set from the C10 orbit. I am surprised this hasn't been used more. The Color is IR-7560-Green-Violet. However, the green image clips the terminator, so that area is filled in with a synthetic green from the IR-7560 image and Violet image. The black and white image is a combination of a super-resolution image produced from the IR-9680, IR-7560, and Violet image, all of which were transmitted after being binned 2x2, and, for the areas available, the green image was then merged creating an even better product.



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Phil Stooke
post Aug 22 2005, 06:37 PM
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Ted - fabulous! Keep it up!

Phil


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scalbers
post Aug 22 2005, 06:49 PM
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These can be compared with the cylindrical map that is on my website at http://laps.fsl.noaa.gov/albers/sos/sos.html#EUROPA


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tedstryk
post Aug 22 2005, 07:10 PM
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That map is awesome...I hve spent much time admiring it.

As for the color mosaic, I have tried many times to make it, but I have hit pitfalls. First, the lack of green data on the terminator. Second, when I try to fill it in with lower resolution data, it looks odd, since the green image is the only one sent back at full resolution. Third, the albedo patterns looked wierd, because the green filter data was used as for the grayscale. By making a super-res image from the binned imagery, I was able to prevent a great resolution drop on the terminator and was able to make a more realistic grayscale image without degrading it with low resolution input. By overlaying the green image over a synthetic green created from violet and IR data, I was able to make the end of the green image less noticeable.

The only other galileo global shot of Europa was from the e17 orbit. I have crudely matched it with other color data here...I will put more time into this someday. I also plan to eventually work on the G1 data and merge it with some other data for a global view.



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JRehling
post Aug 22 2005, 07:20 PM
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QUOTE (Phil Stooke @ Aug 22 2005, 11:37 AM)
Ted - fabulous!  Keep it up!

Phil
*


Ditto. My silence belies awe and gratitude.

John
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scalbers
post Aug 22 2005, 07:35 PM
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Ted,

Your images are very nice as well, particularly the large gibbous view in post #1. One thing in particular I'd consider is comparing the hue and saturation realism to what I had used, namely the colors from Bjorn's map (that I may have tweaked a bit). Do you have a feel for the pros and cons of the color accuracy compared with Bjorn's? Both look pretty good to me - I wonder what new insights you have come up with. I'll reread your posts as well.


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