Post Conjunction: Santa Maria to Cape York, The Journey to 'Spirit Point' |
Post Conjunction: Santa Maria to Cape York, The Journey to 'Spirit Point' |
May 3 2011, 04:24 AM
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#286
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
... That's not the same map at a variety of scales - you can't deduce anything from one regarding the other. Phil: You are the map expert here and I don't want to argue with you about maps (because I'll probably lose that argument). I will admit that I had assumed the various published maps were all based on the same map, because the colors used for the various units are identical. I don't *know* that they are the same map at various scales, but it certainly seemed like a reasonable assumption to me. You state, "That's not the same map at a variety of scales." Do you *know* that to be true? -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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May 3 2011, 05:05 AM
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#287
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Senior Member Group: Members Posts: 2228 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
... you'll know what I mean when I say that CT on many geologic maps of Mars is sort of equivalent to Qf on Earth geologic maps. It's the crap that gets in the way of us seeing what's going on with the bedrock. Anything exposed in crater walls is usually too small in spatial extent to be mapped intelligently; CT covers the crater and its ejecta that obscure what was going on underneath, just like Quaternary fill obscures geology in Earth's valley floors. That's really a pretty good way to describe it, Emily. As an avid reader of your blog, I can say that you have quite a talent for describing obscure things in ways that are very assimilable. -------------------- ...Tom
I'm not a Space Fan, I'm a Space Exploration Enthusiast. |
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May 3 2011, 07:25 AM
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#288
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Member Group: Members Posts: 568 Joined: 20-April 05 From: Silesia Member No.: 299 |
-------------------- Free software for planetary science (including Cassini Image Viewer).
http://members.tripod.com/petermasek/marinerall.html |
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May 3 2011, 09:43 AM
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#289
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
That's really good work, Peter.
Wider angle view, made from thumbnails again... http://twitpic.com/4sqhvw/full -------------------- |
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May 3 2011, 02:14 PM
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#290
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Solar System Cartographer Group: Members Posts: 10127 Joined: 5-April 05 From: Canada Member No.: 227 |
"Do you *know* that to be true?"
The use of similar color schemes makes it look like they are the same map, but this is misleading. Obviously there is something in common between them as well, but they are not the same. First, they are very different scales, so it's not just a case of the same digital image being shown in full and in an enlarged detail, which was really what I meant at first. As different map images, the color schemes don't have to mean exactly the same thing. More importantly, though, different scales mean (in this case) different levels of generalization. The regional view (Miyamoto map) aggregates all the Meridiani plains material into one unit. The detailed map of Cape York splits that into multiple units - including the hydratyed material and terraces. The green things are confused by the cartographer - in the regional map they use green for two different things, Bololu materials (mostly ejecta, a specific geologic unit) and a morphological class of feature, the post-Noachian craters. Note how the green is in the crater depressions, not the ejecta deposits of those craters. In the detailed map green is used again for morphology - crater depressions, some extremely subdued and, frankly, geologically indistinguishable from the material they formed in. And if you look at Endeavour in the regional map, the blue Noachian material is not just shown on the hills of the rim but as a complete ring around the crater, looking like the inner slope of Endeavour. The detailed map correctly maps the inner slope below Cape York as the red plains material and related units. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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 4 2011, 10:35 AM
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#291
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
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May 4 2011, 07:38 PM
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#292
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Member Group: Members Posts: 252 Joined: 27-April 05 Member No.: 365 |
Long ago the MER team realized they needed to alternate forward and reverse driving to keep lubricants better distributed in the wheels, but when they they decide that the healthiest thing for Oppy was to do 95% backwards driving?
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May 4 2011, 09:08 PM
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#293
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
The FR wheel starts drawing a lot more current if they drive forwards. Driving backwards, it's elevated above the others, but not as much and not in an upwardly trending way.
It would have been a few months after Victoria they made the switch I think. |
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May 4 2011, 09:17 PM
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#294
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Solar System Cartographer Group: Members Posts: 10127 Joined: 5-April 05 From: Canada Member No.: 227 |
There are new pictures of Freedom 7 up at JPL, but still not at the Exploratorium.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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 4 2011, 09:21 PM
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#295
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Member Group: Members Posts: 404 Joined: 5-January 10 Member No.: 5161 |
NASA's update, with good image of the new crater: http://www.jpl.nasa.gov/news/news.cfm?rele...mp;auid=8289598
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May 4 2011, 10:55 PM
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#296
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Junior Member Group: Members Posts: 59 Joined: 12-November 09 Member No.: 5039 |
Admin: A series of posts moved from Oppy Map thread.
Did some forum archaeology and found this from pre-Victoria days: Call me crazy, but this is what I think should happen assuming Oppy never dies. <<a map with "wild dream" how Oppy would drive to Endeavor>> You're crazy. (well, you did ask) Seriously - you're talking 6+ x the current traverse distance. Even with a grad-student-controlled 3 wheel drive rover in 5 years time - that's just not going to happen. |
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May 4 2011, 10:58 PM
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#297
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Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
And Squyres would have told you the rovers would be dead after 120, maybe 150 sols.
I'm in good company. You will also see that over time, I come around to the idea. |
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May 4 2011, 11:20 PM
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#298
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
I was absolutely sure there was no frakking way in a dozen different hells that Oppy could possibly make it to Endeavour, too. Not a lack of faith in the rover, or her team, just a stronger faith in eeeevil Mars to do its damndest to kill Oppy before she even got half way.
Very glad to have been proved wrong. -------------------- |
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May 4 2011, 11:57 PM
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#299
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Member Group: Members Posts: 754 Joined: 9-February 07 Member No.: 1700 |
Question for the very talented and skilled folks stitching together these wonderful images: is it easier to work with thumbnails or lower res images than the larger images? Can you substitute the high res images onto your work on the thumbs?
I'm guessing YES and YES. Edit: definitely easier on the clock due to smaller file sizes, but how 'bout on a superfast computer? |
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May 5 2011, 12:08 AM
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#300
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Superior design inevitably results in superior performance. There should be an entire systems engineering textbook written about the MER design...hmm...maybe I just invented a project for myself...
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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