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mcaplinger
Posted on: Aug 14 2012, 06:04 PM


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QUOTE (vikingmars @ Aug 14 2012, 03:04 AM) *
...this would please NASA which tries always its best to show that it integrated well the Metric System for its Mars program since the loss of the the "Mars Climate Orbiter" ("MCO") mission in 1999.

I grow tired of MCO being used as the poster child for the evils of imperial units. The unit conversion problem was merely the root cause in a long chain of mistakes and missteps, technical and organizational, which could and should have been caught and fixed.
  Forum: MSL · Post Preview: #188567 · Replies: 199 · Views: 178815

mcaplinger
Posted on: Aug 14 2012, 02:33 AM


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QUOTE (jmknapp @ Aug 13 2012, 05:20 PM) *
...earth-shattering photos... which was "withheld" for almost a week...

In some cases the image is only partially received on the ground the first time around and retransmissions have to be commanded. That can slow things up, sometimes considerably. Also, images can be prioritized low and get stuck behind higher-priority data. I seem to recall images showing up weeks or even months after acquisition on MER. So the lag is pretty meaningless.
  Forum: MSL · Post Preview: #188510 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 13 2012, 06:28 PM


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QUOTE (jmknapp @ Aug 13 2012, 10:07 AM) *
Sounds reasonable--but isn't SCLK measured in 'ticks'?

You don't get the subseconds in the filename, so you will be off by a second minus a tick worst-case.
  Forum: MSL · Post Preview: #188434 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 13 2012, 04:18 PM


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QUOTE (jmknapp @ Aug 13 2012, 07:44 AM) *
From the file name, the et is 397506083...

My guess is that this is not ET but SCLK, which drifts from ET. You need to use scs2e (or sct2e) to get this into ET.
  Forum: MSL · Post Preview: #188424 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 13 2012, 03:14 PM


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QUOTE (algorimancer @ Aug 13 2012, 07:28 AM) *
If someone could clarify how to get the sol/time from the image title, that would be much appreciated.

Another thing lacking is camera orientation. For MER, this could be obtained from the Pancam Tracking Database. I'm not aware of any such database as yet for MSL.

For Navcam the file name has the SCLK value for the image time, I think. For MMM it appears there is no SCLK in the filename and metadata would be needed to figure out the time. I'm not sure what the time on the raw image website means, I haven't tried to correlate it.

The NAIF website (http://naif.jpl.nasa.gov/naif/data_mars.html) has some information about how to map SCLK to UT and LMST and may be a source for pointing data (I'm not sure what the CK files there look like or what their plan is to update it.)
  Forum: MSL · Post Preview: #188419 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 13 2012, 02:26 PM


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QUOTE (Airbag @ Aug 13 2012, 06:46 AM) *
Really - against a very high gear ratio?

I'm not sure exactly what happened on MER or what the gear ratio is in the MSL drive train (for the teeny brushless motors in the cameras back-driving them is indeed very hard) but since MER had a commutator issue and brushless motors don't have commutators or brushes, we shouldn't need to worry about that. I'm not sure, but I assume that MSL has redundant windings also.
  Forum: MSL · Post Preview: #188417 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 13 2012, 02:21 PM


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QUOTE (kenny @ Aug 13 2012, 02:28 AM) *
Any idea when we will get a picture of the summit of Mount Sharp?

Now that the daily press conferences are over I'm not sure what the plan is for discussing the activity timeline. Alas, I'm not authorized to share the details. On the general topic of doing more imaging, you can rest assured that the team is just as interested (for example, I'd love to see some 100mm imaging!) and we'll be doing it as soon as we can subject to all the constraints.
  Forum: MSL · Post Preview: #188415 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 13 2012, 03:54 AM


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QUOTE (Astro0 @ Aug 12 2012, 08:02 PM) *
It is of no value to complain about it.

I'm on the camera team and I'll complain about it if I want to, thanks.

That said, this is kind of an interesting article.
http://www.informationweek.com/government/...web-s/240005286
  Forum: MSL · Post Preview: #188379 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 13 2012, 02:18 AM


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QUOTE (elakdawalla @ Aug 12 2012, 06:45 PM) *
I reported the same to Veronica McGregor a few days ago (who is not in charge, but obviously can talk to whomever is) and she said that they officially do not care about bandwidth since everything is stored in the cloud.

That's not a useful response IMHO. The camera thumbnails are lovingly antialiased onboard to be as good as they can be at their minimal size, so just tossing them seems really lazy, and it's contributing to make the pages load really slowly even if you have a fast connection.

As for metadata, if I recall correctly this was provided in a separate file for MER. There are no technical barriers to doing the same thing for MSL...

Let me emphasize, just my own opinion and not an official position, etc.
  Forum: MSL · Post Preview: #188367 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 13 2012, 12:56 AM


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QUOTE (jmknapp @ Aug 12 2012, 05:40 PM) *
Noticed a little bug on the JPL raw images web site...

That sounds like a useful bug report, but I have no idea who's in charge of the website. I'll ask around. Maybe Doug knows?
  Forum: MSL · Post Preview: #188361 · Replies: 373 · Views: 260807

mcaplinger
Posted on: Aug 12 2012, 11:40 PM


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QUOTE (dvandorn @ Aug 12 2012, 04:14 PM) *
...a lot more detailed info on the MER wheels, their failure modes and how these impact MSL operations...

MER used brushed actuators, while MSL uses brushless, so the lifetimes should be much longer.
  Forum: MSL · Post Preview: #188355 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 11 2012, 05:43 PM


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QUOTE (bergadder @ Aug 11 2012, 10:10 AM) *
2) A few years back I send my kids names and mine to mars on this mission, I would like to show them where the names on the rover are in one of the images coming down..
Alas, I cannot find the location .. can anyone point this location of the names (microchip) out.. or maybe that image has not been downlinked.?

I did the same thing.

Seen from the RSM the chips are under the UHF antenna just above a JPL logo. This frame was partial in the first Navcam pan but it will show up eventually. See ground image at http://mars.jpl.nasa.gov/msl/images/COPY_M..._on_deck-br.jpg
QUOTE
3) Is there a URL location to retrieve the certificates, like was done for MER.?

I couldn't find one, unfortunately. If you didn't save the initial certificate there doesn't seem to be a record of it.
  Forum: MSL · Post Preview: #188196 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 11 2012, 04:11 AM


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QUOTE (jmknapp @ Aug 10 2012, 06:04 PM) *
It was about 3 in the afternoon though. Does it make sense that the sun would be behind the downward-pointing camera?

On the chute the spacecraft (and the camera) wasn't pointing down, it was pointing more or less in the anti-sun direction. It only goes vertical later in the descent.

The MARDI FOV is 71x53 degrees.
  Forum: MSL · Post Preview: #188163 · Replies: 370 · Views: 290187

mcaplinger
Posted on: Aug 10 2012, 07:29 PM


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QUOTE (ZLD @ Aug 10 2012, 12:18 PM) *
As more and more MARDI images come down I keep seeing this bright patch come and go.

That's the zero phase spot (point on the ground on a line between the camera and the sun) on the ground. See also "opposition effect". [ugordon beat me to it.]
  Forum: MSL · Post Preview: #188120 · Replies: 370 · Views: 290187

mcaplinger
Posted on: Aug 10 2012, 04:21 PM


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QUOTE (ugordan @ Aug 10 2012, 06:26 AM) *
I distinctly heard Mike Malin say he only brightened the images?

I don't know precisely what he did and "brightened" covers a lot of ground. I see a perceptual color change even if I just do a level adjustment. At any rate, the raw data speak for themselves; I'm pretty happy with the straight-out-of-the-camera image quality.
  Forum: MSL · Post Preview: #188098 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 10 2012, 04:11 PM


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QUOTE (jekbradbury @ Aug 10 2012, 07:54 AM) *
It looks like the combination of Bayer issues and jpeg compression is producing artifacts, or something like that.

google for "interline image sensor smear". Only likely to be an issue for very short exposure times.
  Forum: MSL · Post Preview: #188096 · Replies: 370 · Views: 290187

mcaplinger
Posted on: Aug 9 2012, 08:22 PM


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QUOTE (Ant103 @ Aug 9 2012, 11:48 AM) *
This is by far the best I can do… :/

That's really nice. Maybe we should just skip sending back the full-res Mastcam frames. smile.gif

BTW, note the better contrast on the fiducials and the Curiosity logo in Navcam compared to Mastcam. Definitely a thin haze of dust over everything.
  Forum: MSL · Post Preview: #188018 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 9 2012, 01:20 PM


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QUOTE (jmknapp @ Aug 9 2012, 03:45 AM) *
as soon as I can find out for sure how JPL defines the start of each MSL sol.

See ftp://naif.jpl.nasa.gov/pub/naif/MSL/kern...gc120806_v3.tsc
  Forum: MSL · Post Preview: #187921 · Replies: 21 · Views: 50077

mcaplinger
Posted on: Aug 9 2012, 10:10 AM


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QUOTE (JTN @ Aug 9 2012, 01:36 AM) *
Do we think the grit got in there before the mast was raised, or fell in during?

Before, you can clearly see it in the sol 1 pre-RSM-deploy Mastcam thumbnails.
QUOTE
Was this amount / size of debris expected?

I certainly wasn't expecting it.
  Forum: MSL · Post Preview: #187907 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 9 2012, 03:25 AM


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QUOTE (charleski @ Aug 8 2012, 06:52 PM) *
I was surprised that it's so sharp at f/3, but looking through the 2001 JGeophysRes paper I see that the MARDI used on the Polar Lander didn't have a bandpass filter. Is the sensor completely naked with no bandpass or birefringent filters?

About the only thing that the MSL MARDI has in common with the MPL/PHX MARDI is the name.

The MSL MARDI has a bandpass filter (minus blue/IR cut) as a coating on one of the optical elements. The sensor has microlenses and the bayer pattern color filter array, but since any contamination is sitting right on top of those (only a few microns above the photosites, I would guess) the f/cone really doesn't matter very much.
  Forum: MSL · Post Preview: #187838 · Replies: 199 · Views: 178815

mcaplinger
Posted on: Aug 9 2012, 12:41 AM


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QUOTE (elakdawalla @ Aug 8 2012, 02:16 PM) *
It will be very simple to answer that question as soon as another full-res raw frame is posted. If its position doesn't change, it's crud.

If it's not crud on the sensor, then by an amazing coincidence it's at exactly the same pixel coordinates as a feature I can see in the pre-delivery flat fields taken back in 2008. rolleyes.gif

And yes, pieces of debris on the sensor are this well-defined.
  Forum: MSL · Post Preview: #187816 · Replies: 199 · Views: 178815

mcaplinger
Posted on: Aug 8 2012, 07:05 PM


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QUOTE (elakdawalla @ Aug 8 2012, 08:24 AM) *
Mike, just curious, are you colocated at JPL, or did they leave you minding the house in San Diego?

I'm in San Diego. I have a low tolerance for meetings smile.gif and this way if there's a problem I'm better positioned to do troubleshooting on engineering model hardware.
  Forum: MSL · Post Preview: #187760 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 8 2012, 04:02 PM


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QUOTE (dvandorn @ Aug 8 2012, 07:51 AM) *
The navcam raws seem to have a lot less contrast than what I'm used to seeing from the same types of cameras on the MERs.

I'm not sure what you're reacting to -- the full frames seem fine to me and I can't tell anything from the thumbnails. I was surprised the full was as clean as it was. I'd suspend judgment until the fulls of the deck come down.
  Forum: MSL · Post Preview: #187727 · Replies: 1152 · Views: 962313

mcaplinger
Posted on: Aug 8 2012, 05:31 AM


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QUOTE (Explorer1 @ Aug 7 2012, 08:18 PM) *
There's a tiny spot just to the right of the shield (in the full resolution linked above); is that just an artifact or real?

I'm pretty sure that's a piece of crud on the sensor; I see one in the ground flats at about col 614 row 428.
  Forum: MSL · Post Preview: #187609 · Replies: 199 · Views: 178815

mcaplinger
Posted on: Aug 8 2012, 02:58 AM


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QUOTE (elakdawalla @ Aug 7 2012, 05:58 PM) *
Are you guys asleep at the wheel? Where's the image magery?

In all fairness, there's only so much you can do with the thumbnails, the real magic will start when all of the full frames are back.
  Forum: MSL · Post Preview: #187583 · Replies: 370 · Views: 290187

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