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Galileo Imagery, I couldn't find a topic not specific to one moon....
tedstryk
post Dec 9 2007, 07:50 PM
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Here is a combination of all of Galileo's global color views of the Galileans. I have left out the large Europa mosaic because much of its color data is pulled from other orbits. I have also left out colorized views. Due to inconsistent filter selection, there some variation between images. I posted the Europa set in another thread, but I figured I would add the views of Ganymede and Callisto.

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elakdawalla
post Dec 20 2007, 03:17 PM
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TTT -- I probably shouldn't refer to my image database in blog entries -- I mean the internal planetary.org image database that is used to populate our website with pictures. I'm proud of it because when we redesigned our website late in 2005 it's one of the things I demanded -- an image library where we can upload one copy of an image, with caption and credit, and it auomatically produces the three browse sizes we use, and spits out the formatted html code for our pages, and we never lose the files or have to rewrite captions, something we used to do regularly before the redesign. I suppose in a future redesign we ought to make this publicly searchable but, I'm very sorry to say, the idea didn't occur to me when we were doing the redesign.

--Emily


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tedstryk
post Dec 20 2007, 04:27 PM
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That is a really cool feature. By the way Emily, I really like the description of the kind of work I do (the explanation of the difference between what I do and what scientists do - at least most of the time (you will understand in a month or two)). In trying to portray what an object in space looks like, there are often trade-offs. Planetary objects don't have big gores in the side of them and discolored sections where one or two filters didn't cover. So, for the sake of producing a nice picture, creating convincing gapfill is important. However, if such images were used for science, such methods could lead some unfortunate person to think that they had discovered a truly different region. I will admit that I am MUCH more pliable with what I am willing to do with Galileo images than with other probes, as its coverage is so spotty. Where I draw the line is cloning over gaps with fictional features or features from another region - I always use actual images of the missing region or a gray fill that is roughly keyed to the surrounding albedo features. I realize, however, that those folks who produce maps for renderings to be viewed at any angle really don't have a choice but to clone missing regions.

For Galileo, I have even tried to play around with some of the better Opnavs. Sometimes there is a rotation sequence as Galileo approached a moon (usually Ganymede) which allows one to build up. Here is Ganymede on orbit J0 (after insertion and approaching the G1 encounter).

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Here is Europa on orbit G2 using the same technique.

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For the most part, these are tiny images (there are closer opnavs, but due to the compression formula, the data is so skeletal that recovery is impossible). The reason I bothered to figure out a recovery technique is that there are a handful of shots that would have been great "Kodak Moments" had the High Gain Antenna worked, but Galileo didn't have the luxury of taking such pictures. I wanted to test the technique before I bothered with some more difficult images. Here is one from orbit E4. On the left side, the only change I have made is to de-interlace Ganymede, which only has every third row (every fourth row near the top). I reconstructed the missing parts of Io using high phase data from other orbits and the hole in Ganymede from other shots in the sequence of opnavs. I colorized the images based on other orbits.

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tedstryk
post Apr 14 2009, 01:38 PM
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I have re-reworked the closer I32 global view, and in the process I noticed something - you can see the planetshine - lit hemisphere. I know there are plenty of images showing this in much more detail, but I was mainly taken by the fact that I had worked with this dataset so much and never noticed this. The reason is probably that I was focused on making the image black in all areas off the limb except for the faint plume on the upper right. However, due to glow from the daylit hemisphere, the background is actually brighter than the planetshine on the right side of the image, so I probably destroyed it in earlier versions. I wiped out color in the planetshine area because it was not picked up in all filters, making for a very odd appearance. The first image is my new "regular" version, the second is with the planetshine area enhanced.

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Posts in this topic
- tedstryk   Galileo Imagery   Dec 9 2007, 07:50 PM
- - ElkGroveDan   Galileo imagery? APOD August 30 1996 Great wor...   Dec 9 2007, 08:47 PM
- - nprev   ...wow, Ted! Thank you; that's an incredib...   Dec 9 2007, 09:59 PM
|- - ugordan   QUOTE (nprev @ Dec 9 2007, 10:59 PM) Watc...   Dec 9 2007, 10:22 PM
|- - tedstryk   Actually, I didn't forget....There are so many...   Dec 9 2007, 10:27 PM
|- - tedstryk   This one is actually from Voyager, showing Europa...   Dec 19 2007, 09:03 PM
- - Tom Tamlyn   This seems like the right place to mention that Em...   Dec 19 2007, 10:07 PM
- - nprev   Congrats, Ted; Emily's made you an internation...   Dec 20 2007, 05:22 AM
- - elakdawalla   TTT -- I probably shouldn't refer to my image ...   Dec 20 2007, 03:17 PM
|- - tedstryk   That is a really cool feature. By the way Emily, ...   Dec 20 2007, 04:27 PM
|- - tedstryk   I have re-reworked the closer I32 global view, and...   Apr 14 2009, 01:38 PM
- - PhilCo126   Here's a special image of the Jovian moons: ht...   Apr 23 2009, 08:00 AM
|- - DrShank   nice! but Galileo image compression almost alw...   Apr 23 2009, 07:10 PM
- - Bjorn Jonsson   Having seen what Cassini has done at Saturn I...   Apr 24 2009, 12:25 AM
|- - stevesliva   QUOTE (Bjorn Jonsson @ Apr 23 2009, 08:25...   Apr 24 2009, 02:12 PM
|- - DrShank   QUOTE (stevesliva @ Apr 24 2009, 09:12 AM...   Apr 24 2009, 10:37 PM
|- - ugordan   Yes, Cassini has 12 bit A/D converters and althoug...   Apr 25 2009, 12:40 PM
- - Sunspot   It's a shame its going to be at least 30 odd y...   Apr 24 2009, 10:09 PM
|- - tedstryk   QUOTE (Sunspot @ Apr 24 2009, 10:09 PM) I...   Apr 27 2009, 11:53 PM
|- - tedstryk   Here is another nice view from Galileo, taken duri...   May 1 2009, 06:24 PM
|- - DrShank   QUOTE (tedstryk @ May 1 2009, 01:24 PM) H...   May 2 2009, 04:09 AM
- - Phil Stooke   I expect the other things visible in sunlight were...   Apr 24 2009, 10:15 PM
- - Bjorn Jonsson   This is true and even long exposures might have be...   Apr 25 2009, 01:42 PM
- - Phil Stooke   Cassini at Iapetus was moving very slowly, but Gal...   Apr 25 2009, 04:31 PM
|- - ugordan   True, but Io also receives much more jupitershine ...   Apr 25 2009, 04:39 PM
|- - tedstryk   In these images, compression was not the worst pro...   Apr 25 2009, 08:12 PM
|- - john_s   Actually there are a few low-resolution, global, G...   Apr 27 2009, 10:23 PM
- - machi   Beautiful images! Io is really very photogenic...   Nov 9 2009, 06:06 PM
- - machi   Asteroid Ida in false color.   Dec 1 2009, 11:26 AM
- - djellison   False colour? really? I've stretched the sat...   Dec 1 2009, 11:34 AM
|- - machi   QUOTE (djellison @ Dec 1 2009, 12:34 PM) ...   Dec 1 2009, 11:40 AM
- - Phil Stooke   Since the original mosaic was monochrome, any colo...   Dec 1 2009, 01:28 PM
- - paxdan   I believe machi is using false colour to mean arti...   Dec 1 2009, 01:55 PM
|- - machi   Full inline quote removed - ADMIN Right. This is ...   Dec 1 2009, 02:33 PM
- - djellison   A more appropriate phrase would have been 'col...   Dec 1 2009, 03:20 PM
- - jekbradbury   As Jason Perry pointed out a couple months back ov...   Dec 25 2009, 08:54 PM
|- - tedstryk   Impressive! By the way, I don't think I...   Dec 26 2009, 04:12 AM
|- - tedstryk   I posted a short Europa-related blog entry yesterd...   Dec 28 2009, 06:59 PM
|- - ugordan   Here are two rough color views from Galileo. Valh...   Jan 7 2010, 11:53 AM
- - volcanopele   What a difference rotating an image can make: F...   Jan 21 2010, 10:59 AM
- - machi   Amazing! I'm not geologist, but I have see...   Jan 21 2010, 01:06 PM
|- - DrShank   or a slightly different take, simulating the view ...   Jan 21 2010, 02:53 PM
|- - DrShank   QUOTE (DrShank @ Jan 21 2010, 08:53 AM) a...   Jan 22 2010, 01:10 PM
- - Explorer1   On a related note, look at what made it onto Wikip...   Mar 2 2010, 03:28 AM
- - volcanopele   I had this on my blog a few days ago, but I've...   Mar 11 2010, 10:39 PM
|- - stevesliva   QUOTE (volcanopele @ Mar 11 2010, 06:39 P...   Mar 12 2010, 04:29 AM
- - nprev   Those are just mind-blowing, Jason. I never knew...   Mar 12 2010, 04:33 AM
|- - ugordan   Shamelessly stealing volcanopele's 10ISIOGLOC0...   Jul 26 2010, 09:15 PM
- - Decepticon   Oh wow Gold!   Jul 27 2010, 12:29 AM
- - JohnVV   I thought that this one was the correct color and ...   Jul 27 2010, 05:01 AM
|- - volcanopele   QUOTE (JohnVV @ Jul 26 2010, 10:01 PM) I ...   Jul 27 2010, 06:22 AM
|- - ugordan   QUOTE (volcanopele @ Jul 27 2010, 08:22 A...   Jul 27 2010, 12:53 PM
|- - tedstryk   QUOTE It is indeed more correct. The images look m...   Jul 27 2010, 02:18 PM
|- - ugordan   QUOTE On any computer monitor, the dynamic range i...   Jul 27 2010, 05:33 PM
|- - tedstryk   I'm not confusing anything. Not only is the m...   Jul 27 2010, 06:56 PM
|- - ugordan   QUOTE (tedstryk @ Jul 27 2010, 08:56 PM) ...   Jul 28 2010, 05:51 PM
- - eoincampbell   Really brilliant work here, much appreciated...   Jul 27 2010, 06:04 AM
- - JohnVV   color ???? "that is the question " when ...   Jul 27 2010, 07:10 AM
|- - DrShank   QUOTE (JohnVV @ Jul 27 2010, 02:10 AM) co...   Jul 28 2010, 04:24 PM
- - volcanopele   Wow, yeah, that is WAYYYY too red and dark. Bjorn...   Jul 27 2010, 07:17 AM
- - 4th rock from the sun   My non technical argument would be that we use mon...   Jul 28 2010, 01:44 PM
- - volcanopele   My biggest issue at this point seems to be that th...   Jul 28 2010, 06:03 PM
|- - ugordan   QUOTE (volcanopele @ Jul 28 2010, 08:03 P...   Jul 28 2010, 06:10 PM
- - volcanopele   hmm, that doesn't seem to work, but then again...   Jul 28 2010, 06:27 PM
|- - ugordan   Hmm. I'm stuck with a laptop right now with lo...   Jul 28 2010, 06:38 PM
- - JohnVV   oops i posted the wrong link -- i am going to hav...   Jul 28 2010, 07:59 PM
- - 4th rock from the sun   Regarding image color profiles and the Web: My per...   Jul 28 2010, 08:48 PM
- - JohnVV   well there is AdobeRGB1998.icc HP5000_UVDuraImage...   Jul 28 2010, 09:09 PM
|- - ugordan   Perhaps this digression should be extracted into a...   Jul 28 2010, 09:22 PM
|- - ugordan   An 8-footprint, roughly natural color Galileo mosa...   Aug 30 2010, 06:51 PM
|- - tedstryk   Nice. I have a blog entry about that data set tha...   Aug 31 2010, 04:24 PM
- - machi   Little animation experiment with two Jupiter's...   Apr 1 2011, 07:21 PM
- - Bjorn Jonsson   Wow... When doing these morphed animations, are y...   Apr 2 2011, 02:46 PM
- - machi   Normally I'm using Sqirlz Morph, because of bi...   Apr 2 2011, 03:39 PM
- - machi   Cross-eye 3D view of 11 km high Tohil Montes and R...   Jul 30 2011, 04:24 PM
- - elakdawalla   that is very cool, Machi!!   Jul 30 2011, 06:28 PM
- - algorimancer   That's gotta be the most dramatic view of Euro...   Jul 30 2011, 08:39 PM
|- - volcanopele   QUOTE (algorimancer @ Jul 30 2011, 01:39 ...   Jul 30 2011, 09:43 PM
|- - tedstryk   Yeah, you won't find topography like that on E...   Jul 30 2011, 10:25 PM
|- - algorimancer   QUOTE (tedstryk @ Jul 30 2011, 04:25 PM) ...   Jul 31 2011, 01:54 AM
- - Phil Stooke   Unless it's Europa in Philovision. Phil   Jul 31 2011, 01:02 AM
- - machi   It's my fault, I forgot "Ionian" bef...   Jul 31 2011, 10:43 AM
- - machi   Now, more stereoscopic images (BW and color anagly...   Aug 2 2011, 05:53 PM


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