Images from Viking Orbiters |
Images from Viking Orbiters |
Dec 6 2010, 08:16 AM
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#1
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"Storm and Shadow"
Phobos shadow passing over dust storm in area of Viking 1 Lander landing site. Artificially colourised animation made from 20 frames taken by Viking 1 Orbiter. Timewarp 40×.
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May 19 2012, 06:51 PM
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#61
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Member Group: Members Posts: 399 Joined: 28-August 07 From: San Francisco Member No.: 3511 |
A feast for the eyes, Viking comes alive, it's such a careful treatment of a spectacular view, thanks for sharing.
-------------------- 'She drove until the wheels fell off...'
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May 20 2012, 08:37 AM
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#62
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
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May 20 2012, 10:49 AM
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#63
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Thanks to all!
With all my Vikings mosaics and animations, I reduced number of images in my folder with favorite Viking images from ~2250 to ~2100, so there is still what to do. -------------------- |
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May 22 2012, 11:56 AM
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#64
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Possibly the best Viking mosaic of Mars I have ever seen. You mention that as part of the processing the images were warped. Was this done to correct for the vidicon distortion or to make it possible to mosaic them without getting ugly seams?
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May 22 2012, 01:30 PM
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#65
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Solar System Cartographer Group: Members Posts: 10184 Joined: 5-April 05 From: Canada Member No.: 227 |
Spacecraft motion between frames?
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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May 22 2012, 01:55 PM
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#66
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"Was this done to correct for the vidicon distortion or to make it possible to mosaic them without getting ugly seams?"
Vikings vidicons had relatively small geometric distortion (compared to previous Martian mission Mariner 9). So I did warping only for mosaicking and resizing (bUnwarpJ does both things in one process). Only problems are with corners, which have most severe geometric distortion. So if possible, I used central parts from overlapping images, which have lowest geometric distortion. "Spacecraft motion between frames?" It looks, that spacecraft motion between frames was relatively low. After all, Viking was in higher (and slower) part of his orbit. -------------------- |
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May 22 2012, 07:34 PM
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#67
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Junior Member Group: Members Posts: 53 Joined: 15-July 09 Member No.: 4867 |
Isis does not provide enough metadata for a fine and automatic warping then registration ?
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May 22 2012, 07:52 PM
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#68
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
It's hard to map project an image when two corners are in space.
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May 25 2012, 12:17 AM
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#69
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Junior Member Group: Members Posts: 53 Joined: 15-July 09 Member No.: 4867 |
Sure it's harder, but... not that much, it's still geometry basics. I thought Isis could handle those cases.
Thanks for the information, it's good to know. Congrats machi, the image is really great ! I love the details in the atmosphere... |
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May 25 2012, 08:17 AM
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#70
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"Isis does not provide enough metadata for a fine and automatic warping then registration ?"
I don't use ISIS. I haven't LINUX yet (at home), but I want them (LINUX+ISIS) for my new computer (not for mosaicking, but for 3D modeling - shape from shade etc.). -------------------- |
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Jul 4 2012, 11:41 PM
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#71
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
Conway Snyder (Viking Project Scientist at JPL) had a fascination for the Tharsis Plateau. In 1978, he ordered VO-1 to take some specific images in order to build a great mosaic of this spectacular geological feature. But VO-1 needed two passes to take the full perspective. The images were taken during orbits 753 and 759...
Now, you can see the perpective fully processed : an unusual and spectacular view of Mars taken from almost above its topmost point : Olympus Mons. In the far distance, Valles Marineris is stretching towards the horizon and vanishes among mists, dust layers and clouds. The weather was cloudy above some places and Conway was not so happy at 1st glance : he expected crystal clear pictures everywhere. He let Marcia Neugebauer, his "wizard" deputy for imagery, built a crude mosaic : he was so happy with the result that he had it published in a JGR issue... Now thanks to modern computer techniques, you can see Conway Snyder's perspective revisited with the pictures fully processed and pasted together. Of course, not with Marcia's glue... The size of the mosaic is reduced 50% to fill inside the UMSF forum. Enjoy this work dedicated to : - Conway Snyder http://www.unmannedspaceflight.com/index.p...st&p=179235 , - Marcia Neugebauer : most Viking Orbiter mosaics done for Press releases at JPL (the beautiful ones printed on glossy photographic paper -now collectibles-), were built by Marcia ; - and the Planetary Society (for which Conway was a much involved member, starting from TPS' very origins) |
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Jul 5 2012, 10:20 PM
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#72
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
... Although the images were taken as panchromatic filtered pics, and because of some UMSF friends personal requests, here is the colourized version of the mosaic (using multiple-layers colouring). Enjoy !
... and let me dedicate this mosaic to our UMSF forum "Cartographer-in-Chief" : Phil Stooke, who deserves so oftenly our congratulations for his work and for sharing it with us. |
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Jul 6 2012, 12:24 PM
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#73
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
It's gorgeous!
"The size of the mosaic is reduced 50% to fill inside the UMSF forum." I think, that you can send full resolution image to Emily's "Amateur Space Imaging" site. It would be very nice addition. "and let me dedicate this mosaic to our UMSF forum "Cartographer-in-Chief" : Phil Stooke, who deserves so oftenly our congratulations for his work and for sharing it with us." I totally agree! -------------------- |
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Jul 6 2012, 05:03 PM
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#74
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Solar System Cartographer Group: Members Posts: 10184 Joined: 5-April 05 From: Canada Member No.: 227 |
Merci! It's beautiful.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Dec 13 2012, 09:16 AM
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#75
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
I think, that you can send full resolution image to Emily's "Amateur Space Imaging" site. It would be very nice addition. Thanks a lot and good idea ! I'll do it when the previous images I sent a while ago are published inside the "Amateur Space Imaging" site. I think they are overburied with work and cannot take more huge images now. No problem : I'll wait then |
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