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Phoenix SSI Reference Material
djellison
post May 9 2008, 09:11 PM
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Finally - I found an image of the Phoenix SSI with, I presume, two spare MER CCD's inside

http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2156.pdf

It's sprouted a big lump on top of the white cylinder MPF and MPL design, due, I presume, to the use of two CCDs instead of one.

Doug
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James Sorenson
post Jun 10 2008, 03:00 AM
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Why isn't the "Peter Pan" Mission success panorama being done at full resolution color?. I would think that they would be doing this at full resolution. Or are they gonna do that later after this pan?.
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Deimos
post Jun 10 2008, 07:45 PM
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QUOTE (James Sorenson @ Jun 10 2008, 03:00 AM) *
Why isn't the "Peter Pan" Mission success panorama being done at full resolution color?. I would think that they would be doing this at full resolution. Or are they gonna do that later after this pan?.

This is a really good question, and like all such, it has multiple answers.

One answer is about quality. On that front, the color pan from SSI is actually closer to full resolution than, say an image from your digital camera (making assumptions here..). The difference is your camera hides that fact, SSI is open. A typical Bayer pattern CCD takes images such that the green are half-resolution and the red and blue are quarter resolution. The image is manipulated on chip or in software to predictively extrapolate to full res before you ever see it. SSI has some filters at full res, others at quarter res, and they can be upconverted even better than the Bayer-sampled images can be (see the sol 2 pan press release, based on 1 full res and 2 1/16th res filters).

OK, the pan will be full res, but why not do better? Well,there's the practical answer. We need to see the pan before it is useful to us. Finishing it on sol 150 is not an option. So, design a pan that can be acquired and downlinked in a reasonable time. This pan is a requirement for full mission success, and a useful planning tool (interpretation of immediate workspace through context, identification of interesting distant features). So you figure out how many frames you want, how many sols you have to finish, and what fraction of the downlink you can use (unlike MER, the panoramic camera is merely one of 3.5 major data hogs). Then, you land, get great comm and thermal, end up with more data. So the runout version of the pan is obsolete, and the new and improved pan is in. Another practical issue is that Phoenix has very little flash memory. The pan is the last thing saved, almost, so we cannot just take lots o' data and play it back at leisure.

Isn't it a waste to take multiple pans? Well, no. An "efficient" way to acquire a pan would be to spend the whole mission getting the best quality. That would mean on sol 45 *half* the site is unseen. Thus we plan not 2, but 3 pans. The sols 1-3 site pan, low res, for quick look. The full res color pan to sol 30(??). Then, maybe, if needed, a high res, low compression, many filter pan. But if that never happens, we're still good. (Actually we need to reacquire the low res site pan a couple times, just as pancam does, as part of an orbiter-coordinated experiment.)
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Posts in this topic
- djellison   Phoenix SSI Reference Material   May 9 2008, 09:11 PM
- - Deimos   Additional information is online. http://www.met....   May 23 2008, 03:17 AM
- - elakdawalla   Oooohh...juicy info that only a true space enthusi...   May 23 2008, 03:51 AM
|- - djellison   QUOTE (elakdawalla @ May 23 2008, 04:51 A...   May 23 2008, 07:40 AM
|- - mhoward   QUOTE (elakdawalla @ May 22 2008, 09:51 P...   May 23 2008, 01:12 PM
|- - algorimancer   QUOTE (mhoward @ May 23 2008, 07:12 AM) ....   May 28 2008, 12:28 PM
- - climber   From Mark links, I hope to this very soon (with an...   May 23 2008, 04:18 AM
- - slinted   Here's a rough graphic showing the hue through...   May 25 2008, 11:13 AM
- - mhoward   I just found out something remarkable via #space. ...   May 28 2008, 02:52 AM
|- - slinted   Sorry I didn't point this out earlier. I thoug...   May 28 2008, 03:10 AM
|- - algorimancer   QUOTE (mhoward @ May 27 2008, 09:52 PM) ....   May 28 2008, 12:47 PM
|- - jamescanvin   QUOTE (algorimancer @ May 28 2008, 01:47 ...   May 28 2008, 02:22 PM
|- - Del Palmer   QUOTE (jamescanvin @ May 28 2008, 03:22 P...   May 28 2008, 04:16 PM
|- - elakdawalla   QUOTE (jamescanvin @ May 28 2008, 06:22 A...   May 28 2008, 04:21 PM
|- - algorimancer   QUOTE (jamescanvin @ May 28 2008, 08:22 A...   May 28 2008, 06:29 PM
- - elakdawalla   Remarkable...yes... OK, mhoward, why haven't ...   May 28 2008, 03:09 AM
|- - AndyG   QUOTE (elakdawalla @ May 28 2008, 04:09 A...   May 28 2008, 03:03 PM
- - ahecht   QUOTE (mhoward @ May 23 2008, 09:12 AM) A...   May 28 2008, 05:52 AM
|- - pechisbeque   QUOTE (ahecht @ May 28 2008, 07:52 AM) I ...   May 28 2008, 02:07 PM
- - ahecht   QUOTE (pechisbeque @ May 28 2008, 09:07 A...   May 28 2008, 03:02 PM
|- - pechisbeque   QUOTE (ahecht @ May 28 2008, 05:02 PM) Ye...   May 28 2008, 03:27 PM
|- - Deimos   QUOTE (pechisbeque @ May 28 2008, 03:27 P...   May 28 2008, 04:50 PM
|- - algorimancer   Mark/Deimos, Enjoyed your talk on today's pre...   May 28 2008, 06:39 PM
- - jamescanvin   Can someone explain to me why some of the SSI imag...   Jun 1 2008, 02:46 PM
|- - ugordan   I wondered about the same thing, James. Could it b...   Jun 1 2008, 02:58 PM
|- - Airbag   Perhaps the wind is moving the SSI slightly in bet...   Jun 1 2008, 03:04 PM
- - jamescanvin   I don't think it can be optical characteristic...   Jun 1 2008, 03:16 PM
|- - Deimos   QUOTE (jamescanvin @ Jun 1 2008, 03:16 PM...   Jun 2 2008, 12:13 AM
|- - Tom Tamlyn   Informative blog entry by Mark Lemmon discussing ...   Jun 2 2008, 03:00 AM
|- - jamescanvin   QUOTE (Deimos @ Jun 2 2008, 01:13 AM) Wor...   Jun 2 2008, 07:18 AM
- - Airbag   With all the attention on the filters, let's n...   Jun 6 2008, 05:14 PM
- - Deimos   An attempt at browseable access to the raw images ...   Jun 9 2008, 10:40 PM
|- - fredk   QUOTE (Deimos @ Jun 9 2008, 10:40 PM) An ...   Jun 10 2008, 03:01 PM
- - djellison   Mark - that's just ideal - perfect. Given how...   Jun 9 2008, 10:44 PM
- - Shaka   Ya gotta love it!   Jun 10 2008, 12:55 AM
- - Airbag   Man, I almost hate to mention this...but the Sol 1...   Jun 10 2008, 01:12 AM
- - James Sorenson   Why isn't the "Peter Pan" Mission su...   Jun 10 2008, 03:00 AM
|- - ugordan   I was wondering about that as well, James. Seems l...   Jun 10 2008, 08:09 AM
|- - Deimos   QUOTE (James Sorenson @ Jun 10 2008, 03:0...   Jun 10 2008, 07:45 PM
- - djellison   MER did it. Twice.   Jun 10 2008, 08:46 AM
- - vk3ukf   Oh, these pages are heavenly, really. May I ask y...   Jun 11 2008, 11:20 AM
- - climber   From Mark row images pages Sol 17 : http://www.met...   Jun 12 2008, 10:36 PM
- - Tman   Currently it isn't possible to match these two...   Jun 17 2008, 09:51 AM


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