Images from Viking Orbiters |
Images from Viking Orbiters |
Apr 2 2017, 06:37 AM
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#91
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Member Group: Members Posts: 255 Joined: 28-October 12 Member No.: 6732 |
Stunning view as always, jccwrt! But please note that the volcano visible is Ascraeus Mons.
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Apr 3 2017, 03:11 AM
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#92
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Member Group: Members Posts: 306 Joined: 4-October 14 Member No.: 7273 |
Thanks for the correction, I've updated the flickr description of the image.
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Sep 27 2017, 04:47 PM
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#93
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Member Group: Members Posts: 306 Joined: 4-October 14 Member No.: 7273 |
Somewhere in the northern hemisphere in November 1978. Metadata isn't helpful in figuring out exactly where. I have a hunch that the large crater in the lower left corner is Lomonosov, but there are so few surface features visible that I can't confirm.
View over Vastitas Borealis looking towards the north pole in September 1979 |
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Sep 28 2017, 01:15 PM
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#94
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
Your hunch is correct. Lomonosov is the largest crater. Kunowsky is the other one at upper right (due south of Lomonosov). Very faintly visible to clinch the identification are a crater at lower left (due north of Lomonosov) and a cluster of small features just south of Kunowsky.
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 PDF: 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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Sep 30 2017, 05:47 PM
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#95
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Member Group: Members Posts: 306 Joined: 4-October 14 Member No.: 7273 |
Thanks Phil!
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Dec 26 2017, 07:17 AM
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#96
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Member Group: Members Posts: 306 Joined: 4-October 14 Member No.: 7273 |
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Mar 30 2018, 10:16 PM
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#97
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Member Group: Members Posts: 306 Joined: 4-October 14 Member No.: 7273 |
I've been experimenting with a trial and error method to get pseudo-true color mosaics from single-color RED filter mosaics. Given that most of the surface albedo information is contained in the red portion of the spectrum, I've been creating synthetic blue images by dramatically reducing the contrast, manually brighten the horizon to simulate scattering, adding topography back in by overlaying a high-pass filtered red image, and then creating a synthetic green image by some blend of the red and blue images. It's not the most scientific method, but I think it does get close and is a nice quick way to see Mars in color.
My first attempt was with a large mosaic of Valles Marineris: Valles Marineris synth color - Viking Orbiter 1 - Orbit 663 - 04-11-78 Modifying my process a bit, I assembled this 36 frame southern hemisphere monitoring mosaic. Viking Orbiter 2 - Southern Hemisphere Monitoring The original black and white version of the second mosaic is also on my flickr page. |
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Mar 30 2018, 11:16 PM
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#98
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Member Group: Members Posts: 923 Joined: 10-November 15 Member No.: 7837 |
Great work Justin, I tried this idea before and came up so short.
At first glance I thought it was a true rgb image! -------------------- |
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Mar 31 2018, 06:24 PM
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#99
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
They are really nice. It's good to see the beautiful Viking data still in use - I remember how amazing it seemed when all we had before was Mariner 9. Color imaging sure has come a long way since the 70s!
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 PDF: 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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