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Virtual Viking, Images and animations of the Viking landing sites
nprev
post Jul 1 2009, 05:01 AM
Post #46


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Ooo...gotta be some good stuff in there, Phil, happy hunting!

Admit that I'm most curious to know just how close they came to selecting Meridiani as the V1 landing site.


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Phil Stooke
post Jul 13 2009, 08:38 PM
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OK, back from Providence with lots of goodies.

Nprev - they didn't get close to choosing site C2 - Meridiani. They had three sites at that latitude, Capri, Meridiani and Schiaparelli (C1, C2, C3), but they never considered any but C1 seriously.

C1 was called Capri, but it was not in Capri Chasma, part of Valles Marineris. It was on the plateau north of the canyon. A similar site was considered for Mars '84, an ambitious rover mission.

Phil


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scalbers
post Jul 13 2009, 09:30 PM
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QUOTE (Phil Stooke @ Jun 16 2009, 06:37 PM) *
A good panorama for Viking 2 is hard to find. I have gone through the online CR-ROMs at PDS and extracted everything useful, and combined it here in one panoramic image.

For each camera I took morning and afternoon pans, and for camera 1 also a noon pan. Then, for each camera, I made a composite of the multiple views, with flaws or gaps in one fixed from one of the others. The tricky part after that was to combine Camera 1 and Camera 2. My intention is to mimimize obstructions by spacecraft components and maximize the visible surface, plus to combine the two views of the foreground into a full view of the sampling area. This cannot be done without introducing distortion in this view. Later I will rubbersheet the image to fit proper ground control for a photomap of the sampling field.

Phil

[attachment=18324:full_pan_v2x_post.jpg]


Phil I assume you worked with hi-res images? For comparison at this MSSS link are some VL2 mosaics (bottom of page). These are later versions of the ones I worked on during my internship at JPL in 1977.

http://www.msss.com/mars/pictures/viking_l...ing_lander.html

I have just photographic prints/negatives of the earlier versions, unfortunately they aren't in digital form.

Nice to hear you got a chance to look at Tim Mutch's papers. He was certainly a great person to have had the privilege of working with.


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nprev
post Jul 13 2009, 11:48 PM
Post #49


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Welcome back, and thanks for checking that out, Phil! smile.gif

So, when's the book coming out? Gotta admit that the hindsight gained from everything since Viking makes the project's history even more fascinating. 'There were giants in those days!'


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Phil Stooke
post Jul 14 2009, 12:12 PM
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My current plan is to submit the manuscript at the end of 2011, for publication a year later. That would be for Volume 1, up to Mars Express. Volume 2 would follow about 3 years later. But a final decision on a 1 or 2 volume format has not been made yet, and if it's a single large volume it will take 5-6 years.

Phil


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Phil Stooke
post Aug 10 2009, 01:14 AM
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Here's a little goodie from my visit to Brown University earlier this summer (and big thanks to everybody there for the help, both in the archives in the John Hay Library and in the RPIF).

This map shows the first serious effort to pick landing sites for Viking. If you read the NASA history volume 'On Mars', by Ezell and Ezell, those authors mention a meeting late in 1970 when the members of the Viking Landing Site Working Group proposed 'several lists of sites, including six by Carl Sagan'. But Ezell and Ezell don't identify the sites. I hoped to find the committee minutes, among Tim Mutch's papers in the archives. I did get to see his papers, but mostly material on Mars 1984 (a rover mission) plus some interesting personal things about his Himalayan expeditions before the one he died on.

But in the RPIF I found - or rather Peter Nievert found for me - a real gem. Ezell and Ezell had written a much more complete account of the site selection process, in a hand-annotated typescript. It must have been condensed for the later history volume, but this version had all the missing bits in it - very nice indeed. So here is a map of those sites, chosen when the only spacecraft data were from Mariners 4, 6 and 7 (so plotted on a Mariner basemap).

Phil

Attached Image


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machi
post Nov 9 2009, 05:23 PM
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Viking 2 lander site in years 1976 and 1978.
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machi
post Nov 9 2009, 05:40 PM
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"High speed" panorama from Viking 1. Its low-res, not so good as from vikingmars (really awesome job!).
But its all around panorama.
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machi
post Nov 10 2009, 03:31 PM
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Morning on Mars from Viking 2 lander. First image was transferred to Earth without middle part.
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scalbers
post Nov 15 2009, 09:17 PM
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QUOTE (scalbers @ Jul 13 2009, 09:30 PM) *
Phil I assume you worked with hi-res images? For comparison at this MSSS link are some VL2 mosaics (bottom of page). These are later versions of the ones I worked on during my internship at JPL in 1977.

http://www.msss.com/mars/pictures/viking_l...ing_lander.html

I have just photographic prints/negatives of the earlier versions, unfortunately they aren't in digital form.

Nice to hear you got a chance to look at Tim Mutch's papers. He was certainly a great person to have had the privilege of working with.


Here by the way is a montage of the quadrant pairs in the MSSS versions of the VL2 Camera 1 pm mosaic. These are less than the full resolution however they are corrected for the VL2 tilt.

Attached Image


Steve
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scalbers
post Nov 15 2009, 09:29 PM
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...and the same for camera 2.

Attached Image


As a reminder I have links to the full resolution VL1 mosaics from the JPL photojournal about halfway down in this web page:

https://stevealbers.net/albers/viking.html

Also noted is Calvin Hamilton's mosaic from VL2 (full resolution, corrected for tilt). I had worked on VL2 hi-res mosaics for morning, noon, and afternoon with each camera (as available) so it would interesting to see these all assembled into one place.


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Stu
post Nov 15 2009, 11:19 PM
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scalbers, Machi - just fantastic work, guys, genuinely thrilling to see those images. I wonder what amazing sights we'd enjoy if we - and by "we" I obviously mean geniuses like you! - went back through the all Viking data and used modern image processing techniques on the lesser-known images...


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scalbers
post Nov 16 2009, 01:09 AM
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Stu - one "modern" thing I've long been interested in would be to combine low-res color information with the hi-res mosaic intensities. This might look pretty good if the lighting were close enough in each.

Steve
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Phil Stooke
post Nov 16 2009, 03:54 AM
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All these ideas are very good - and exactly what I was hoping to encourage when I started this thread. I'll dig out some more of my stuff too...

Phil


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4th rock from th...
post Nov 16 2009, 10:51 AM
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QUOTE (scalbers @ Nov 16 2009, 02:09 AM) *
Stu - one "modern" thing I've long been interested in would be to combine low-res color information with the hi-res mosaic intensities. This might look pretty good if the lighting were close enough in each.

Steve


I've tried it and it's very hard to do. You have to correct the lowres color for tilt and camera distortions. Then, light doesn't match at all most of the time.
My guess is that the best approach would be to reconstruct a full mosaic using only color images with consistent lighting and at the best possible resolution.


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