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Posted by: Exploitcorporations Oct 22 2005, 01:36 PM

24ISCOLCHIS01:

Posted by: Decepticon Oct 22 2005, 01:42 PM

Just as Europa deserves a orbiter so does IO.

All this pic needs is color!

Posted by: Exploitcorporations Oct 22 2005, 01:52 PM

24ISSTEREO01:

Posted by: tedstryk Oct 22 2005, 06:26 PM

Good mosaics! I have been working with Io a bit lately too. Here is the I32 color image. I have been attempting to develop a technique to effectively process images of targets as color-varied as Io with my usual methods, and have made some progress. Still problematic though.

http://img449.imageshack.us/my.php?image=io132colgood10am.jpg

Here is a variant.

http://img402.imageshack.us/my.php?image=io132colgood29de.jpg

Posted by: hubdel11 Jan 5 2006, 10:03 PM

this work is just amazing !
Do you use the pds images ?
Are you planning new mosaics ?

Posted by: volcanopele Jan 5 2006, 10:11 PM

Nice work everybody. Nice to see some people working with the I24 data. There really is a lot of neat stuff there as long as you are careful not to overinterpret and be mindful of the limits of the reconstructed data set.

For the first few years here at UA, I worked with Galileo Io data. My only official released image, is a view of Gish Bar Patera taken during the I32 encounter: http://photojournal.jpl.nasa.gov/catalog/PIA03884 . This image was taken a few months after a major outburst at that particular volcano. Even did an LPSC abstract about it.

Posted by: ljk4-1 Jan 6 2006, 03:14 AM

When Io was first imaged by Voyager 1 in 1979, why did they assume it was such a bright red-yellow color? Thus the famous pizza comparison.

Posted by: edstrick Jan 6 2006, 10:22 AM

Voyager's selenium-sulfur detector based vidicon tube cameras had good near-UV sensativity, but crappy red and zero far-red sensativity. "red" filtered images had an effective bandpass better described as "orange". Voyager could not take true color red/green/blue images with filter bands reasonably well matched to the nominal human eye's bands.

Posted by: Bjorn Jonsson Jan 6 2006, 11:59 AM

To make matters even worse most of the Voyager color composites of Io I have seen are OGV (orange-green-violet) and not OGB.

Also Io's spectrum is weird with some of the areas that are bright in the Galileo red filtered images indistinguishable from nearby areas in the Voyager orange filtered images. These same areas are even brighter relative to nearby areas at near-infrared wavelengths (e.g. Galileo 756 nm images).

A few years ago I made a crude attempt to get a more realistic color balance from Galileo images by creating synthetic blue images from green and violet images (Galileo had no blue filter) using Voyager images as a guide. These images can be seen here:

http://www.mmedia.is/bjj/3dtest/ (scroll down a bit and look for Io's color)

While I'm sure these are not true color images I still believe they are closer to true color than the publicly released Galileo RGV images.

Posted by: Exploitcorporations Jan 11 2006, 09:16 AM

24ISAMSKGI01:

Posted by: Exploitcorporations Jan 11 2006, 09:26 AM

Sorry it took so long to reply. The deconvolved I24 images came from an ftp server, but it's been so long (early 2000) that I cannot recall the URL. I'm not sure if they've made it onto the PDS. I assume their absence is due to the difficulty in properly calibrating these radiation-mangled monstrosities for scientific use. The above mosaic is a very crude approximation, made with cheat-sheet assistance from the PIA release from 2000. There will be more to come.

Posted by: tedstryk Jan 11 2006, 01:08 PM

If I can ever recover my old hard drive, I had copies. Exploitcorporations, perhaps you should change your name to Exploitseeminglyhoplessdatatomakesomegreatimageproducts Probably too long....

Posted by: hubdel11 Jan 12 2006, 03:47 PM

Well, i've found the raw data at
http://pdsimg.jpl.nasa.gov/data/go-j_jsa-ssi-2-redr-v1.0/go_0022/i24/io/repaired/c052079
but the quality is not the same !

Posted by: volcanopele Jan 12 2006, 07:20 PM

There were plans to release, seperate from the PDS release, the deconvolved I24 images. Unfortunately, nothing came of it, but if I can figure out a way to do it quickly, perhaps it can be revived.

Posted by: elakdawalla Jan 12 2006, 07:24 PM

I'd be happy to host them on the TPS site...

--Emily

Posted by: volcanopele Jan 12 2006, 07:31 PM

The plan was to host it locally, so I think we are good in terms of space and bandwidth. It just requires the time to set it up.

Posted by: belleraphon1 Jan 13 2006, 01:03 AM

These mosaics are absolutely incredible. How beautiful they are while profiling
a world so incredibly deadly to us feeble water/carbon beings.

Exploitcorporations please share any mosaics you have of this magnesium lava sulphur lake world.

Emily, please host them.....

I think Galileo's wonderful imaging, while limited due to the lack of high gain,
has been widely underrated. and, as Carl Sagan understood, there is far more to these missions than science.... there is the sublime art of seeing another world. And that worth does not have a price....... it uplifts us all....

(sorry, I am prepping a seitan, mushroom, potato fry meal for tomorrow and, while marinating the seitan on port, have probably drunk far more than I should have).

Craig

Posted by: ugordan Jan 13 2006, 07:54 AM

Excuse my ignorance, but what's the deal with deconvolving I24 images? Were they heavily motion blurred? Radiation noise coupled with high image compression?

Posted by: OWW Jan 13 2006, 08:23 PM

These mosaics are from volcanopele's old website I believe. They are not pretty, but still... It's IO!!!

Posted by: Exploitcorporations Jan 13 2006, 08:59 PM

Yes!!!

Posted by: Decepticon Jan 13 2006, 09:02 PM

Did Galileo get close ups of Loki? Was there any change since the Voyager Flyby's?

Posted by: volcanopele Jan 13 2006, 09:44 PM

This is the best image I am aware of showing Loki:

http://photojournal.jpl.nasa.gov/catalog/PIA03530

In terms of surface changes, there was nothing major, but given the style of volcanism, that is expected. Loki is essentially a horseshoe-shaped lava lake that overturns the cooled crust periodically.

Nice to see Io discussed here even if a mission won't get there for another 13 months.

Posted by: Exploitcorporations Jan 13 2006, 10:17 PM

[URL=http://photojournal.jpl.nasa.gov/catalog/PIA02517]

Posted by: vexgizmo Jan 21 2006, 10:19 PM

By the way, there should be an acknowledgement when presenting any of the I24 images that have been descrambled, so now that includes this site:

"The scrambled raw data for this image was unscrambled by a program
developed at JPL using the LabVIEW software from National Instruments of
Austin, TX."