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Images from Viking Orbiters
bobik
post Apr 2 2017, 06:37 AM
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Stunning view as always, jccwrt! But please note that the volcano visible is Ascraeus Mons.
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jccwrt
post Apr 3 2017, 03:11 AM
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Thanks for the correction, I've updated the flickr description of the image.
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jccwrt
post Sep 27 2017, 04:47 PM
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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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Phil Stooke
post Sep 28 2017, 01:15 PM
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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


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... because the Solar System ain't gonna map itself.
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jccwrt
post Sep 30 2017, 05:47 PM
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Thanks Phil!
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jccwrt
post Dec 26 2017, 07:17 AM
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Some Viking color mosaics I've worked on over the few months:

South pole monitoring, August 11, 1977:


Lunae Planum and Valles Marineris, April 11, 1978:


Tharsis Montes, June 24, 1978:


North pole monitoring, July 29, 1978:


Noachis Terra, April 9, 1980:


Terra Sabaea, April 12, 1980:
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jccwrt
post Mar 30 2018, 10:16 PM
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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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Sean
post Mar 30 2018, 11:16 PM
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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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Phil Stooke
post Mar 31 2018, 06:24 PM
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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


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