Voyager 2 Saturn Revisited, Still a lot to be processed and reprocessed |
Voyager 2 Saturn Revisited, Still a lot to be processed and reprocessed |
Jan 20 2007, 02:36 AM
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#1
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Emily recently mentioned in her blog the availability of calibrated and geometrically corrected Voyager images. Actually I had 'discovered' this dataset several months earlier but then managed to completely forget about it. Now I decided to do something so I downloaded volume 37 and decided to do some quick-and-dirty processing, mainly to check if it was feasible to do a very high resolution map (probably 25 degrees/pixel to match my Cassini map of the southern hemisphere) of Saturn's entire northern hemisphere by colorizing green filtered images using lower resolution color data I processed several years ago - at the resolution I want only green filtered images are available.
This was successful, opening the door to a new 'monster project': A very high resolution full color map of Saturn's entire northern hemisphere. First a color composite made from wide angle orange, green and blue images: This one was made from images C4386547_GEOMED.IMG, C4386554_GEOMED.IMG and C4386608_GEOMED.IMG. I adjusted the color to something more realistic than I initially got and removed some reseau marks in Photoshop that were visible, especially near ring edges and Saturn's limb. Some color fringing was also visible on Saturn's disk due to Saturn's rotation while the three images were obtained; I removed this by cloning the color of adjacent areas. The spokes in the rings presented similar problems. I then colorized a green filtered image obtained at a similar time as the wide angle images above. This was the result: The image should be fairly realistic and I was happy with the result, especially because I didn't do this very carefully - something better should be possible. Finally the same image sharpened with an unsharp mask: Lots of small scale details are visible, especially near the pole. I will probably post several additional Voyager Saturn images in the next several weeks. As previously mentioned, the plan now is to do a very high resolution map of Saturn's entire northern hemisphere based on these calibrated and rectified images. This means reprojecting the images to simple cylindrical projection. To do this I need to know the viewing geometry. Does anyone know if this information is available somewhere (or if not, if it's likely to ever become available)? I have some SPICE kernels which give me Voyager 2's location relative to Saturn. These are probably fairly accurate. However, the limited instrument pointing information I have is very inaccurate so it's useless to me. I can reverse engineer the viewing geometry/pointing but it's a lot of extra work. |
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Dec 4 2009, 04:18 PM
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#46
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Machi, you are rapidly becoming one of my favourite contributors to UMSF - lovely animation!
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Dec 8 2009, 02:03 AM
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#47
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Amazing animation!
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Dec 8 2009, 02:21 AM
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#48
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Senior Member Group: Members Posts: 1281 Joined: 18-December 04 From: San Diego, CA Member No.: 124 |
At the risk of sounding like a cliche, that was pretty awesome!
-------------------- Lyford Rome
"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test |
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Dec 8 2009, 03:04 AM
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#49
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
I'll second that cliche... VERY cool, Machi!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Dec 8 2009, 07:59 AM
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#50
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Senior Member Group: Members Posts: 1441 Joined: 26-July 08 Member No.: 4270 |
That is pretty cool. You can just make out the deep pit craters hinting at the unusual nature of this moon.
-------------------- -- Hungry4info (Sirius_Alpha)
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Dec 8 2009, 07:30 PM
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#51
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
I worked on this sequence back in 2005 but never thought of animating it.
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Dec 8 2009, 07:57 PM
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#52
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Since no one else has mentioned it yet, I just wanted to compliment Bjorn on his amazing job assembling the Jupiter mosaic I posted yesterday. At 2048 by 2048 it's got more pixels on a roughly true-color globe of Jupiter than any other image I've ever seen on the Web.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Dec 8 2009, 08:08 PM
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#53
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Holy Cow! I never clicked to enlarge, so I thought it was some old work I saw him do a long time ago. WOW!
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Dec 8 2009, 08:11 PM
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#54
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
I second this - I've nabbed it for my desktop - truly spectacular - thank you Bjorn.
Jase |
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Dec 8 2009, 08:12 PM
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#55
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Yep, Bjorn posted the image here a while ago and it's truly a masterpiece. Probably the best Voyager Jupiter image I ever saw and the difference in the planet's appearance to more recent images makes it all the more amazing.
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Dec 8 2009, 08:23 PM
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#56
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Actually, this one is better than the one you saw previously, Gordan -- he did extra work cleaning up the terminator.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Dec 8 2009, 08:38 PM
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#57
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Thanks for comments!
And Jupiter from Björn is really amazing! Making mosaic (and in color!) of giant planets is really difficult, because of rapidly changing atmosphere. I think that Björn's mosaic is one of the best images of Jupiter I have ever seen. -------------------- |
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Dec 8 2009, 11:05 PM
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#58
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
i could have used that vid of Hyperion when i did my map
i am still not to sure about the east side of the map . [attachment=19965:saturn_H...an_Vliet.jpg][attachment=19966:1kJVV_Hyperion.jpg] |
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Dec 8 2009, 11:37 PM
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#59
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Solar System Cartographer Group: Members Posts: 10184 Joined: 5-April 05 From: Canada Member No.: 227 |
Very interesting!
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Dec 9 2009, 11:59 AM
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#60
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Since no one else has mentioned it yet, I just wanted to compliment Bjorn on his amazing job assembling the Jupiter mosaic I posted yesterday. At 2048 by 2048 it's got more pixels on a roughly true-color globe of Jupiter than any other image I've ever seen on the Web. The only higher resolution global color mosaic I have seen of Jupiter is this Cassini true color mosaic. There is another well know high resolution global Cassini mosaic but its resolution is not as high as in the new Voyager 2 mosaic and the color balance could also be improved. This new Voyager 2 mosaic is by far the highest resolution global color mosaic I have seen of Jupiter from Voyager data. As previously noted the new Voyager 2 mosaic is an improved version of an earlier mosaic I did several years ago. The resolution is somewhat higher, I spent lots of work on the terminator and the color balance is better. It's not perfect though - it's probably impossible to get perfect color if all you have is orange and violet source data. Interestingly almost all of the 'official' Voyager global color images are based on Voyager 1 data. I have seen only 2 or 3 (!) 'official' global Voyager 2 color composites. So in a way I'm filling a gap here . There were also some significant changes to Jupiter's appearance between the two Voyager flybys, especially near the GRS, which make this even more interesting. |
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