Voyager and Galileo Images of Ganymede, The Ganymede images and mosaics thread |
Voyager and Galileo Images of Ganymede, The Ganymede images and mosaics thread |
May 18 2007, 09:43 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I've been processing some of the high resolution Galileo Ganymede images recently. As far as I know the two mosaics below have not appeared at the official websites (at least not in this form) so in a sense they are 'new'.
The first one was obtained during the G1 flyby in 1996. It covers a part of Memphis Facula which is centered at roughly 15°N, 132°W. The images were obtained at a distance of approximately 5000 km from Ganymede's center. The second one was obtained during the G28 flyby in May 2000. It is centered near 14.5°S, 319.7°W. The images making up the mosaic were obtained at a distance of roughly 4500 km from Ganymede's center. I will probably post more Ganymede mosaics later this month or next month. |
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May 20 2007, 12:15 PM
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
Thanks a lot to all of you for these great mosaics !
These pictures were taken 10 years ago, and there is still a lot to do with them. Did anybody try to assemble the very high resolution pictures taken during G1 over Xibalba Sulcus ? Due to their "bad" quality, it might be difficult. I even don't know if they really overlap ! I also did not find any mention about the G29 images. What about the regional and color polar cap boundary mosaic near Perrine Regio ? Finally, there were these pictures taken when Ganymede was in Jupiter shadow in order to look for aurora events : http://pdsimg.jpl.nasa.gov/outdir/4846r.img.gif I never heard about them in any publication. As you can see, my "frustration" is still quiet high ten years later, and that's why I really enjoy your posts. Marc. |
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May 21 2007, 06:56 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Thanks a lot to all of you for these great mosaics ! These pictures were taken 10 years ago, and there is still a lot to do with them. Did anybody try to assemble the very high resolution pictures taken during G1 over Xibalba Sulcus ? I decided to try but I couldn't identify any common features when examining these images visually so I don't think they overlap (if anyone can prove me wrong please post here!). To check this further I reprojected them to simple cylindrical projection using the viewing geometry information in the IMG files. I then assembled the result into a single map. This resulted in overlap but the images do not match, meaning the viewing geometry information is inaccurate. The map looks like this: Not exactly a high quality map. In addition, there are several problems with the Xibalba Sulcus images: No context images are available, the exact location of the image footprints is unknown and the bright, sunlit slopes are severely overexposed. Thanks Ted. really nice. The color mosaic of Perrine Regio is exactly what I was looking for. However, the polar cap boundary is not really obious. Marc. The polar cap boundary isn't obvious, the change is gradual. "Can't see the forest because of the trees" is a further problem - when I made my 7200x3600 pixel global map of Ganymede the polar cap wasn't obvious enough in the initial version of the map because it wasn't made from global images. I had to post process the map to make the polar caps bright enough, using global images as a guide. PS Lots of great images of Ganymede here . |
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