Galileo Imagery, I couldn't find a topic not specific to one moon.... Options

[tedstryk]

Very nice image that initially confused me a lot since I'm familiar with all of the Galileo global color coverage of Europa (or so I think). When I read where the color is from things became more clear.

It is of course very approximate since the color data comes from very different illumination conditions. When it comes to Galileo data, one is often forced to really push things. I've tried for years to make a good fit for this, and it required fiddling with the gamma in the image and with a bit of filtering to compensate for the luminosity being based entirely on a violet filter image. This is the first version that didn't look to badly "off." Here is another version, on that might be my favorite, that is aesthetically slightly better.

[nprev]

And there's my new desktop. Thanks, Ted!

[tedstryk]

Your welcome...now if Juno and JUICE would hurry up

[tedstryk]

I should add that I removed noise by hand. There was a lot of noise in the image, but no automated removal did a good job removing it without wrecking havoc on the little ridges.

[machi]

Beautiful image, Ted!

It is from orbit E17, isn't it?

BTW, for JUICE is planned NAC camera with 5 microrad resolution.
With this camera, JUICE will obtain two times better images of Europa even from the orbit around Ganymede (and with many filters).

[tedstryk]

Beautiful image, Ted!

It is from orbit E17, isn't it?

BTW, for JUICE is planned NAC camera with 5 microrad resolution.
With this camera, JUICE will obtain two times better images of Europa even from the orbit around Ganymede (and with many filters).

Yes, that's it. Thanks. Trying to turn that violet image into a good "gray" image was a pain. I have made several previous attempts that were much less successful.
Wow, I hadn't read the specifications. Looking at the time this was taken, soon afterwards Europa transited Jupiter. Had Galileo had a working antenna, it would have made for one of the most spectacular movies ever.

[Bjorn Jonsson]

This is a mosaic of the Galileo I25 Europa images:



The 12 images comprising the mosaic were obtained on November 25, 1999 at a distance of 96000 km from Europa. This is the only good global coverage of Europa's Jupiter facing hemisphere. For aesthetic purposes I filled some narrow horizontal gaps by cloning nearby data.

For many years I have wanted to do something with the Europa images but didn't, mainly because a new mission that can image Europa at high resolution didn't seem that far in the future (a decade or so until Jupiter arrival isn't that much in this context). But now I have given up waiting - by now it has become pretty clear that nothing of significance is going to happen until almost 20 years from now when JUICE arrives at Jupiter. The good thing though is that this mission seems very likely to actually happen - more likely than previous mission concepts ever have been.

Because of this long time until the next spacecraft that can obtain hi-res images of Europa arrives I decided to start work on a 16384x8192 pixel global map of Europa using all of the useful Galileo and Voyager images. This mosaic is a 'by-product' from that project.

Interestingly the only mosaic I have found from the I25 data is only 900x900 pixels and has obvious seams since the brightness of the original images is variable:

http://photojournal.jpl.nasa.gov/catalog/PIA02528

[tedstryk]

Great work! Oh, and I for some reason thought that this mosaic was much more spotty than this...wheels are turning in my head...

[kemcab2012]

Wow, Bjorn, that is beautiful! Really makes me want to go through the Galilean imagery and play around. Can't wait to see the final product!

[MarcF]

Wow, really great job ! A stupid question: is it possible to overlay color data from lower resolution color pictures or are they of too low resolution ?
Thanks again for these amazing pictures.
Marc.

[Ian R]

That's a lovely mosaic Bjorn: it really highlights some of the very subtle European topography, particularly the arc-like 'trenches' near the terminator.