My Assistant
| Posted on: Nov 2 2015, 12:35 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Nov 1 2015, 06:01 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
Andrew Bodrov already succeeded in using that technic. 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 |
| Forum: MSL · Post Preview: #227774 · Replies: 999 · Views: 868401 |
| Posted on: Nov 1 2015, 03:42 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
Does anyone know a recent sol when Curiosity has fully imaged its deck ? This has never been done with Mastcam. 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 |
| Posted on: Nov 1 2015, 07:20 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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"? |
| Forum: Image Processing Techniques · Post Preview: #227762 · Replies: 38 · Views: 60528 |
| Posted on: Oct 18 2015, 05:32 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Oct 18 2015, 04:54 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Oct 13 2015, 05:04 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Oct 11 2015, 04:12 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Forum: MSL · Post Preview: #227227 · Replies: 8 · Views: 11629 |
| Posted on: Oct 7 2015, 01:34 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Sep 10 2015, 06:26 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Aug 27 2015, 03:55 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Aug 26 2015, 02:19 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Aug 24 2015, 10:10 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Aug 12 2015, 03:33 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
|
| Forum: MSL · Post Preview: #225275 · Replies: 999 · Views: 868401 |
| Posted on: Aug 11 2015, 11:24 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Aug 11 2015, 06:25 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Aug 5 2015, 03:10 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Jul 16 2015, 04:04 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Jul 15 2015, 04:28 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Jul 9 2015, 07:16 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Jul 9 2015, 06:57 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: Jul 5 2015, 04:56 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
...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 |
| Posted on: May 26 2015, 06:20 PM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: May 19 2015, 05:10 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
| Posted on: May 17 2015, 12:06 AM | |
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2559 Joined: 13-September 05 Member No.: 497 |
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 |
New Replies No New Replies Hot Topic (New) Hot Topic (No New) |
Poll (New) Poll (No New) Locked Topic Moved Topic |
|
Lo-Fi Version | Time is now: 17th December 2024 - 05:29 AM |
|
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
|