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Unmanned Spaceflight.com _ Mars Odyssey _ Best-Yet Look of Valles Marineris
Posted by: SigurRosFan Mar 14 2006, 12:17 PM
- http://www.jpl.nasa.gov/news/news.cfm?release=2006-035 - Years of Observing Combined Into Best-Yet Look at Mars Canyon
- http://themis.asu.edu/vallesspecial - Valles Marineris Special Feature Directory
- http://www.nasa.gov/mission_pages/mars/missions/odyssey/20060313.html - More Images
Enjoy!
Posted by: tedstryk Mar 14 2006, 05:51 PM
- http://themis.asu.edu/vallesspecial - Valles Marineris Special Feature Directory
- http://www.nasa.gov/mission_pages/mars/missions/odyssey/20060313.html - More Images
Enjoy!
That is cool! I hope they do this with MRO images.
Posted by: ljk4-1 Apr 13 2006, 04:41 PM
Image of the Day: A Five-Year Odyssey
http://www.space.com/imageoftheday/image_of_day_060413.html
NASA's Mars Odyssey continues to watch the red planet five years after arriving
at its target.
This archival image was taken by Mars Odyssey in December 30, 2002 during its first full year of operations at Mars.
A team led by Phil Christensen, principal investigator for Odyssey's cameras at Arizona State University, Jim Bell at Cornell University, and space artist Don Davis created this panorama, adding color to radiance files from the Thermal Emission Imaging System (THEMIS), a camera on Odyssey that takes images in both the visible and infrared parts of the spectrum. They also correlated the radiance - intensity of reflected sunlight - with that of other color images from Mars and minimized the effects of residual scattered light in the images.
Posted by: DDAVIS Jun 12 2006, 07:57 PM
Melas Chasma in color:
http://themis.la.asu.edu/zoom-20031114a.html
I thought I would post the steps from the original image to my truer colour version.
Left: the original data as initially presented http://themis-dhttp://themis-data.asu.edu/img/V04622003.html?image=V04622003&banata.asu.edu/img/V04622003.html?image=V04622003&band=321&stretch=S2&tab=0
Middle: the results of laborious hand retouching on each colour channel to remove the light leaks which mar the performance of this otherwise excellent color camera. The violet channel in particular is horribly lightstruck to varying degrees in nearly all such images. Constant comparison with the original was done to minimize subjective retouching effects. The result attempts to emphasize the colour subtlties of the subject the camera is seeing and minimize the ideosynchrosies of the camera itself.
Right, the results of rebalancing the colour to resemble known ranges of Martian hues. This image was widely distributed. More image releases using this technique are forthcoming.
Don
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Posted by: djellison Jun 12 2006, 08:06 PM
I must confess Don, I've often looked at the occasional releases of your work that make it into the Themis IOTD release, and thought "ooo...pretty....let's get some data and have a go" - but the banding just got in the way every time , I had no idea you removed it by hand - truely a labour of love!!! - I thought there was simply a calibration process I was unaware of when using the PDS importer for GIMP.
Posted by: dilo Jun 12 2006, 09:21 PM
Amazing work, Don.
I hope you appreciate this further processing of last image, on the right (essentially a simple sharpening - I removed your intermadiate result)...
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Posted by: gorelick Jun 12 2006, 10:37 PM
I'm (slowly) working on some software to allow you to do this a bit less ad-hoc. The VIS calibration process makes a bunch of initial guesses involving stray-light, and we can expose those settings as knobs that user's can tune on a per-framelet basis, or which can be programmatically optimized.
It's just been pretty low priority.
Posted by: tedstryk Jun 13 2006, 12:45 AM
Great work! It is amazing what can be pulled out of that dataset.
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