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mcaplinger
Posted on: Nov 2 2015, 12:35 AM


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QUOTE (elakdawalla @ Nov 1 2015, 02:07 PM) *
Everyone on the mission who I have talked to about this except for the Mastcam PI agrees that it would be nice to have a Mastcam deck pan...

Maybe, but attempts to get simultaneous Navcam/Mastcam coverage for merging and colorization have not been successful because of lack of science justification, so far as I know due to objections from people other than the PI. We can agree it would be nice, but there are lots of times when nice isn't a good enough reason.

You can be sure that we'll continue to push for it. Another option is to shoot a MAHLI pan from a position somewhere over the rover deck, although this hasn't been looked at by the rover planners and there may be constraints I'm not aware of that preclude it.
  Forum: MSL · Post Preview: #227790 · Replies: 999 · Views: 868401

mcaplinger
Posted on: Nov 1 2015, 06:01 PM


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QUOTE (neo56 @ Nov 1 2015, 09:49 AM) *

We've never been sure how that was made. It didn't appear until after the first MAHLI self-portrait, I don't think, so my presumption was that it used that for deck coverage. But I've never attempted that approach myself. I spent a fair amount of time with Hugin trying to make self-portrait mosaics with some of the gaps filled in with Mastcam images and ran out of patience with the tools. So it may be a matter of better tools and/or more patience smile.gif
  Forum: MSL · Post Preview: #227774 · Replies: 999 · Views: 868401

mcaplinger
Posted on: Nov 1 2015, 03:42 PM


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QUOTE (neo56 @ Nov 1 2015, 03:39 AM) *
Does anyone know a recent sol when Curiosity has fully imaged its deck ?

This has never been done with Mastcam. sad.gif

I suppose in theory the gap could be filled with MAHLI self-portrait data, though that would be geometrically challenging.

I have the impression that occasionally Navcam is used to image the whole deck, but I don't have any tools that can conveniently figure out when this was done. I know it happened shortly after landing (see http://www.nasa.gov/mission_pages/msl/mult...a/pia16063.html ) We have occasionally tried to get a hybrid Mastcam/Navcam pan into the plan, but without science justification this is a tough sell.
  Forum: MSL · Post Preview: #227767 · Replies: 999 · Views: 868401

mcaplinger
Posted on: Nov 1 2015, 07:20 AM


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QUOTE (JohnVV @ Oct 31 2015, 06:07 PM) *
if you watched the movie "the Martian "
the color is pretty on the spot for the soil and rocks

Hmmm. Well, perhaps, but if you read http://io9.com/the-best-effects-in-the-mar...nt-s-1734941505

QUOTE
But what does “looked Martian” actually mean? Well, MPC went straight to the source. “We looked at a lot of the NASA photos from the rovers - some of them from Mars - and there are interesting colors you get in there,” he said. “But a lot of the time it just looked like an overcast day in a desert on Earth.” Instead Ridley Scott wanted all different colors in the skies at all different times. “Sometimes more green-ish, sometimes it more like a coppery or bronze-y color and so we just had to figure out what the color was going to be and what the right mood was going to be for Ridley,” Langlands said.


I loved the movie but I'm not sure I'd use it as a model for accurate color. For example, I was unimpressed by the sunsets. Also, "some of them from Mars"? huh.gif
  Forum: Image Processing Techniques · Post Preview: #227762 · Replies: 38 · Views: 60528

mcaplinger
Posted on: Oct 18 2015, 05:32 PM


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BTW, http://web.stanford.edu/~cantwell/Recent_p...A_2013-3899.pdf is a good review of the history of MAV and ISRU development from the same group that's pushing this hybrid design. I'm afraid they are glossing over a lot of the system complexity issues with their design, but that's pretty typical for this area.
  Forum: Past and Future · Post Preview: #227418 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Oct 18 2015, 04:54 PM


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QUOTE (stone @ Oct 18 2015, 09:22 AM) *
What is the rocket size to launch a 100kg satellite to a stable orbit around Mars?

The math is simple enough -- https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation -- but the devil is in the details.

The 100 kg is obviously arbitrary. http://www.lpi.usra.edu/meetings/marsconce...12/pdf/4342.pdf (which was just the first google hit I found) assumed a payload mass to orbit of 36 kg, 5 kg of which was sample -- this was a two-stage hybrid rocket. Total vehicle mass at liftoff is 288 kg. A single stage was found to be feasible if the payload mass was reduced to 1 kg.
  Forum: Past and Future · Post Preview: #227417 · Replies: 579 · Views: 574619

mcaplinger
Posted on: Oct 13 2015, 05:04 PM


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SPICELIB is set up so that the SPK and CK files can be defined in any frame, or potentially different frames between files. If you load all of the kernels (including static kernels like FK), and you ask for the position of the rover in, say, Mars-center-relative coordinates, by using the frames kernel the software will automatically do all of the needed transforms to get you to the desired coordinate frame.
  Forum: MSL · Post Preview: #227261 · Replies: 8 · Views: 11629

mcaplinger
Posted on: Oct 11 2015, 04:12 PM


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QUOTE (yogi @ Oct 11 2015, 06:32 AM) *
last time I spent a day looking through the NAIF documentation, it seemed really complex / more powerful than what I needed

I'm not sure exactly what you're trying to accomplish, but the NAIF stuff is not a lot more complex than it needs to be IMHO. "There is no royal road to geometry" as Euclid said smile.gif
  Forum: MSL · Post Preview: #227227 · Replies: 8 · Views: 11629

mcaplinger
Posted on: Oct 7 2015, 01:34 AM


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QUOTE (Herobrine @ Oct 6 2015, 02:47 PM) *
I'm considering the following possibilities, to account for what I've observed. I haven't ruled in or out any of them as contributors to what I'm seeing.
1. Readout time may vary between frames.
2. The rate of pixel readout may vary across the frame.
3. Some pixels may contribute more current during readout than other pixels receiving the same amount of light.
4. During readout, additional current may be accumulated more readily depending on the existing current. In other words, accumulation at a pixel can't be modeled as simply as multiplying by a factor.
5. The effect of the dynamic view during readout may be substantial.

I designed the digital electronics for these cameras, so definite nos to 1 and 2. 4 would surprise me. 5 is obviously a major factor for the EDL dataset. 3 is possible, though if you look closely at MAHLI it also has some mild artifacts in the lower right corner. You might try looking at the landed MARDI images where the scene isn't moving.

There are cosmetic ways to remove the residual Bayer smear artifacts. I gather from people we've consulted that this is pretty common with Bayer sensors, though I don't know what the mechanism is.
  Forum: MSL · Post Preview: #227058 · Replies: 529 · Views: 461044

mcaplinger
Posted on: Sep 10 2015, 06:26 AM


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Didn't warrant a mention at http://www.planetary.org/blogs/guest-blogs...ience-deck.html but if you look at the last image in that post, you can see one of the MSSS cameras (Stowcam) on its raised bracket in front of PolyCam.
  Forum: OSIRIS-REx · Post Preview: #226080 · Replies: 70 · Views: 177588

mcaplinger
Posted on: Aug 27 2015, 03:55 AM


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The topic of naming might be considered as an addition to rule 1.9. [MOD- Noted.]

http://planetarynames.wr.usgs.gov/Page/Introduction and http://planetarynames.wr.usgs.gov/Page/Rules are the most succinct statements of current IAU policy. And yes, IAU uses the word "official" a lot; e.g., from http://planetarynames.wr.usgs.gov/Page/FAQ

QUOTE
The International Astronomical Union (IAU) Working Group for Planetary System Nomenclature provides a unique system of official names for planetary surface features, natural satellites, dwarf planets, and planetary rings for the benefit of the international science community, educators, and the general public. A single system of official names is critical for effective scientific communication.
  Forum: New Horizons · Post Preview: #225643 · Replies: 88 · Views: 377873

mcaplinger
Posted on: Aug 26 2015, 02:19 AM


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That looks good, especially if you white-balance it, but the problem has always been in the overlap region where you need to combine framelets from the top and bottom of the image to get full RGB coverage.
  Forum: Juno · Post Preview: #225612 · Replies: 597 · Views: 607347

mcaplinger
Posted on: Aug 24 2015, 10:10 PM


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QUOTE (Gerald @ Aug 24 2015, 10:37 AM) *
There are lots of issues in this version of the image, but I'm unaware of any published version of efb12 with a better alignment of the rgb channels.

Frankly it's hard to tell how well-aligned the color channels are, since for some reason there seems to be little or no color variation in the overlap -- it just looks like a blue-tinted monochrome image.

I spent a lot of time trying to get the full map-projected image color channels to line up, without complete success, so I'm interested to hear what you're doing.
  Forum: Juno · Post Preview: #225575 · Replies: 597 · Views: 607347

mcaplinger
Posted on: Aug 12 2015, 03:33 AM


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QUOTE (James Sorenson @ Aug 11 2015, 04:50 PM) *
How high was the turret above the ground when this was taken?

The rover planners drive the arm, we just command the images. If you look at the images near the drill hole, the motor count suggests the distance was at least 35 cm, so not that close.
  Forum: MSL · Post Preview: #225275 · Replies: 999 · Views: 868401

mcaplinger
Posted on: Aug 11 2015, 11:24 PM


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QUOTE (James Sorenson @ Aug 11 2015, 04:12 PM) *
I apologize to you Mike and the whole MSL team...

No need, James. Using the images is fair game, that's the whole point of public release. It's been interesting to see everyone's take on how to render this one -- the near-360 field of view, the weird angle and the minimal sky coverage makes it more challenging than the original perspective, with more aesthetic choices.
  Forum: MSL · Post Preview: #225270 · Replies: 999 · Views: 868401

mcaplinger
Posted on: Aug 11 2015, 06:25 PM


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QUOTE (wildespace @ Aug 11 2015, 05:23 AM) *
That new "selfie" panorama is from an unprecedented angle, unless I'm mistaken.

How could it be from the same angle and show parts of the rover not visible previously?

There's a certain amount of misinformation about this on the web; for example, see http://gizmodo.com/a-fan-stitched-together...y-ye-1723085310 which implies that this is new processing of old data, which it's not, obviously.

As always we are still working on the "official" version and all of the media attention will be captured by amateur versions, which I suppose is inevitable, if a bit irritating.
  Forum: MSL · Post Preview: #225254 · Replies: 999 · Views: 868401

mcaplinger
Posted on: Aug 5 2015, 03:10 PM


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QUOTE (Ron Hobbs @ Aug 5 2015, 07:49 AM) *

I wonder what the source of the fringe around the Moon is? Color channel misregistration?
  Forum: Earth Observations · Post Preview: #225109 · Replies: 174 · Views: 635649

mcaplinger
Posted on: Jul 16 2015, 04:04 PM


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QUOTE (Blue Sky @ Jul 16 2015, 08:45 AM) *
I am wondering if the crater-counting method of judging the age of a surface needs to be 'calibrated' for the far outer planets differently than it is for the inner ones.

See "Cratering rates in the outer Solar System", Zahnle et al.
http://adsabs.harvard.edu/abs/2003Icar..163..263Z
  Forum: New Horizons · Post Preview: #223786 · Replies: 1286 · Views: 20606961

mcaplinger
Posted on: Jul 15 2015, 04:28 AM


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QUOTE (ZLD @ Jul 14 2015, 08:44 PM) *
we likely won't see fixed filter ccd imagers (like a 'normal camera') in most space missions... the fixed filter imager on Curiosity but it has proved problematic in some circumstances.

You'll be seeing them on Insight and Mars2020 for sure. I'm uncertain what's problematic about them, they've worked great on MSL from my perspective. But they wouldn't have been the right choice for NH.

Mods might consider moving this to a more appropriate thread.
  Forum: New Horizons · Post Preview: #223471 · Replies: 1286 · Views: 20606961

mcaplinger
Posted on: Jul 9 2015, 07:16 PM


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QUOTE (hendric @ Jul 9 2015, 11:59 AM) *
Some of the PDS data might have minimal processing of darks/flats applied, I don't know.

The EDR is the only "raw" data for MARDI. All of the RDR products have had color interpolation performed. There are four flavors of RDR. All are decompressed and radiometrically calibrated. The four flavors are the permutations of color corrected and geometrically linearized. See http://an.rsl.wustl.edu/mer/help/Content/A...data%20sets.htm
  Forum: MSL · Post Preview: #222603 · Replies: 370 · Views: 290187

mcaplinger
Posted on: Jul 9 2015, 06:57 PM


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The MARDI RDR products were color-interpolated using a 5x5 interpolation kernel but there are some slight remaining artifacts that are more visible with a harsh contrast stretch and spatial filter like this appears to be. If you don't like it, go back to the original lossless EDRs, decompress them, and apply your own Bayer interpolation.

I think that the lossless versions of the MARDI descent images are all at http://pds-imaging.jpl.nasa.gov/data/msl/MSLMRD_0003/DATA/ but I'm not 100% certain. Look at the index files on the PDS volumes to see what's where.

It's complicated, obviously, but we went to a lot of effort to document what the data format was and where to find it.
  Forum: MSL · Post Preview: #222600 · Replies: 370 · Views: 290187

mcaplinger
Posted on: Jul 5 2015, 04:56 AM


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QUOTE (qraal @ Jul 4 2015, 06:31 PM) *
...ever since you said (years ago) that "Beagle 2" would dig a hole, due to the modeling being done using the wrong atmospheric composition - N2 instead of CO2 dominated atmosphere.

Of course, all the evidence suggests that Beagle 2 landed successfully and simply failed to unfold, so the EDL system isn't implicated.
  Forum: Exploration Strategy · Post Preview: #222265 · Replies: 24 · Views: 20564

mcaplinger
Posted on: May 26 2015, 06:20 PM


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QUOTE (MarsInMyLifetime @ May 26 2015, 10:48 AM) *
1. What reflective coating was used on the mirrors (aluminum? something more exotic?)?

2. Were the optical components coated in any manner?

I can't speak to the specifics of these instruments but generically:

1) Typically the most reflective stuff available is used. Formulations may be proprietary but "protected silver" is typical for the visible.

2) The best possible AR coatings are used.
  Forum: New Horizons · Post Preview: #220674 · Replies: 31 · Views: 80103

mcaplinger
Posted on: May 19 2015, 05:10 AM


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PDS data is supposed to be fairly simple and easy to interpret. There are a number of ways to view PDS QUBE format (they're really just stacked 2D images.)

GDL is an open-source alternative to IDL that may be compatible with the IDL scripts on these volumes, http://gnudatalanguage.sourceforge.net/ But if you don't know IDL already there is likely going to be a steep learning curve.
  Forum: Venus Express · Post Preview: #220471 · Replies: 7 · Views: 26169

mcaplinger
Posted on: May 17 2015, 12:06 AM


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I can't access the link you posted but if there's time information then you should be able to get all the geometry from the SPICE kernels.

ftp://ssols01.esac.esa.int/pub/data/SPICE/VEX/kernels/
  Forum: Venus Express · Post Preview: #220445 · Replies: 3 · Views: 18852

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