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djellison
Posted on: Nov 26 2009, 09:04 AM


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QUOTE (ugordan @ Nov 26 2009, 08:40 AM) *
Also, such an observation would probably best be carried out as a rapid-fire, single exposure setting sequence letting Mars slide underneath and capturing as many frames as possible.


Bingo - we then sum the frames ( slightly under-exposed ones ) any features cancel themselves out- and we have a flatfield.
  Forum: Mars Express & Beagle 2 · Post Preview: #150876 · Replies: 274 · Views: 616996

djellison
Posted on: Nov 26 2009, 09:03 AM


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QUOTE (serpens @ Nov 26 2009, 08:41 AM) *
And that somehow makes it right?


Yes.

If you want to have a pathetic argument about language and the lexicon of space-ops, find another forum.

While we're playing pedant, you might want to stop breaching forum etiquette via full in-line quoting.
  Forum: Spirit · Post Preview: #150875 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 26 2009, 08:13 AM


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I've always heard 'predicts' used rather than 'predictions' in space ops.
  Forum: Spirit · Post Preview: #150869 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 25 2009, 11:26 PM


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I wonder if by virtue of imaging far closer to mars, on more featureless areas, possibly during dust storms - we might be able to generate a flatfield of some sort.

I'm also wondering if it's worth suggesting to the VMC team that they could well avoid the four different exposure settings, stick with the 2nd of the 4, typically, and either quarter the downlink, quadruple the frame rate, or quadruple the observation duration. There seems to be a pattern of one under exposed, one slightly over exposed and one saturated image for every well exposed image. It's not like we're going to be pulling HDR images out of this stuff.

If we can then constrain observations to that one exposure setting - then we can have just one dark field image, one flat field image, and be much better equipped to process the images.
  Forum: Mars Express & Beagle 2 · Post Preview: #150855 · Replies: 274 · Views: 616996

djellison
Posted on: Nov 25 2009, 11:06 PM


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Pure artistic tweakery.
  Forum: Mars Express & Beagle 2 · Post Preview: #150853 · Replies: 274 · Views: 616996

djellison
Posted on: Nov 25 2009, 10:44 PM


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Why have I not been playing with this stuff more. There's a lot of crescent obs that i just don't think are recoverable to being particularly attractive - but some stuff earlier in the year was awesome smile.gif

Attached - rolled-out action of my saturation + channel tweaking post vmc2rgb
  Forum: Mars Express & Beagle 2 · Post Preview: #150850 · Replies: 274 · Views: 616996

djellison
Posted on: Nov 25 2009, 09:23 PM


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I wonder if there's an observation we could request that could emulate a flat-field.

This is my post VMC2RGB efforts for a few 2009 sequences.

Just realised some of the movies are stupidly long - but the motive behind making them .movs was that in quicktime you can scrub backwards and forwards really easily.
  Forum: Mars Express & Beagle 2 · Post Preview: #150839 · Replies: 274 · Views: 616996

djellison
Posted on: Nov 25 2009, 07:42 PM


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It's a camera artefact, there's some funky internal reflections and god knows what else going on with it.
  Forum: Mars Express & Beagle 2 · Post Preview: #150829 · Replies: 274 · Views: 616996

djellison
Posted on: Nov 25 2009, 01:53 PM


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I see clear motion on the FR during the last drive. Small, but so was the motion from the FL. I don't think small pebbles etc are going to significantly increase the drag caused by that wheel.
  Forum: Spirit · Post Preview: #150814 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 23 2009, 11:09 PM


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Only actually got the one accompanying letter so far ( thank you Nigel ) - need the others soonish.
  Forum: Conferences and Broadcasts · Post Preview: #150745 · Replies: 34 · Views: 23848

djellison
Posted on: Nov 23 2009, 11:00 PM


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Problem is they removed a local tilt to produce the DEM- and I don't know how much - so it was guess work on how to place the rover in terms of tilt etc.
  Forum: Spirit · Post Preview: #150744 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 22 2009, 02:49 PM


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Some rough and ready renderings of Scamander crater based on the OSU elevation map posted with the press conf a week or so ago. The exaggerated elevation is 5x exaggerated.
  Forum: Spirit · Post Preview: #150671 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 21 2009, 11:24 PM


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You can't. Just edit the post - put 'please delete' on it -and an admin will cull it at some point.
  Forum: Cassini's ongoing mission and raw images · Post Preview: #150640 · Replies: 308 · Views: 299431

djellison
Posted on: Nov 20 2009, 07:54 AM


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QUOTE (elakdawalla @ Nov 20 2009, 06:26 AM) *
fermented


I always wondered what the hell we were doing... BREWING. That's it smile.gif
  Forum: Conferences and Broadcasts · Post Preview: #150484 · Replies: 14 · Views: 10465

djellison
Posted on: Nov 19 2009, 03:51 PM


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Microwave (Sojourner) and Washing Machine (Deep Imapct Impactor) are already on the official (but non existent) NASA scale of size objects list smile.gif

Others I know of...
Golf Cart ( MER )
Mini Cooper ( MSL )
School Bus ( Cassini )
Squash Court ( Eagle Crater )
Utah ( Hematite & Meridiani )

Thrust should be expressed in the weight of a piece of paper, or multiples of Jumbo Jets.

All rocks, described in terms of the closest representing piece of fruit.
  Forum: Cometary and Asteroid Missions · Post Preview: #150415 · Replies: 403 · Views: 429472

djellison
Posted on: Nov 19 2009, 08:10 AM


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The second commanded drive is similar to the first commanded drive.

I think we're probably hoping the actual drives are a bit different smile.gif
  Forum: Spirit · Post Preview: #150402 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 18 2009, 05:43 PM


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I'd have gone for it because we need down time for the FR wheel - it's presenting itself very well for IDD work given the limitations of the IDD since its trouble - and it's fairly unique, perhaps deep ejecta from a nearby crater.
  Forum: Opportunity · Post Preview: #150365 · Replies: 916 · Views: 424873

djellison
Posted on: Nov 18 2009, 03:35 PM


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That's a good pre-grind position. Time for some rock-chomping, not done any for a while smile.gif
  Forum: Opportunity · Post Preview: #150358 · Replies: 916 · Views: 424873

djellison
Posted on: Nov 18 2009, 01:25 PM


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A polite reminder repeated from earlier...

This is a warning. Progress may be negligible, it may be significant, it may be entirely invisible and non existent.

DO NOT attempt to draw too many conclusions, positive or negative, regarding the efficacy of the technique, the likelihood of a final extraction and so on. People using words like 'never' or 'certain' or 'wrong' will have firm forum wrist slappings.

Many of you were not around during the month of extraction at Purgatory Ripple. The old hands know how frustrating this process is going to be. Be patient. Do not jump to conclusions. Do not resort to superlatives.

Warning over.


  Forum: Spirit · Post Preview: #150353 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 17 2009, 11:10 PM


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Perhaps you have more windows thumbnail files.
  Forum: Tech, General and Imagery · Post Preview: #150324 · Replies: 945 · Views: 730015

djellison
Posted on: Nov 17 2009, 10:48 PM


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You are such a lightweight smile.gif

91.4 GB on disk (90,627,082,502 bytes) for 407,487 items


I have 50 gig of IMG's though. That's probably cheating. Just deleting them now.
  Forum: Tech, General and Imagery · Post Preview: #150321 · Replies: 945 · Views: 730015

djellison
Posted on: Nov 17 2009, 10:15 PM


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Fred - your anim is good - I think we see the RR wheel digging in a reasonable amount, not much movement on the LR.
  Forum: Spirit · Post Preview: #150319 · Replies: 992 · Views: 639260

djellison
Posted on: Nov 17 2009, 05:47 PM


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Damn - 10fps wide angle movies. Driving. DD's. It's enough to bring a grown space fan to tears.
  Forum: MSL · Post Preview: #150296 · Replies: 68 · Views: 79209

djellison
Posted on: Nov 17 2009, 05:33 PM


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Not entirely accurate is it? If the fixed focus stays - then one eye will be about 3.75x the res of Pancam, the other one, about 1.25x Pancam. But the more I think about it - the more the zoom descope hurts.
  Forum: MSL · Post Preview: #150292 · Replies: 68 · Views: 79209

djellison
Posted on: Nov 17 2009, 04:36 PM


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Unless I'm very much mistaken (and that's quite likely) - it's IMU based.
  Forum: Spirit · Post Preview: #150285 · Replies: 992 · Views: 639260

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