Kilometers on the ground |
Kilometers on the ground |
Jul 21 2017, 10:48 AM
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#1
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Member Group: Members Posts: 122 Joined: 19-November 14 From: Québec Member No.: 7339 |
Hello everyone !
I would like to know more about the mileage grid on the ground. I have difficulty finding precise data from various unofficial sources. Here is my list: ______________________________________________________________________________ Bonjour a tous ! J'aimerais avoir des précisions sur la grille de kilométrage parcourus au sol. J'ai des difficulter a trouver des données bien précises à différentes sources non officiel. Voici ma liste : ______________________________________________________________________________ 1 km Sol 335, 17 juillet 2 km Sol 363, 14 août 3 km Sol 403, 24 sept 4 km Sol 431, 22 oct 5 km Sol 521, 23 janv 6 km Sol 568, 12 mars 7 km Sol 641, 26 mai 8 km Sol 668, 23 juin 9 km Sol 709, 4 août 10 km Sol 957, 16 avril 11 km Sol 1296 12 km Sol 1439 13 km 14 km Sol 1448 15 km 16 km Sol 1669 -------------------- |
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Jul 21 2017, 11:31 AM
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#2
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Member Group: Members Posts: 153 Joined: 4-May 11 From: Pardubice, CZ Member No.: 5979 |
How about this one : http://www.curiositymsl.com/tracking/drivelog.html
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Jul 21 2017, 11:55 AM
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#3
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Member Group: Members Posts: 122 Joined: 19-November 14 From: Québec Member No.: 7339 |
Thank you, but I think the site does not take actual distances into account. It includes the general rolling without descriminating the landslides, the enclosures and others. I am referring to the actual mileage on the distance traveled on the Martian surface.
________________________________________________________________________________ Merci, mais je crois que le site ne tient pas compte des distances réel. Il inclut le roullement général sans descriminé les glissements, les enlisements et autres. Je fais référence au kilométrage réel sur les distance parcourus à la surface martienne. ________________________________________________________________________________ -------------------- |
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Jul 21 2017, 11:00 PM
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#4
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
The data on that web site appears to be matching the telemetry pretty well. If VO (visual odometer) is enabled the odometer does take into account slippage (if that's what you meant by landslide). VO is being used all the time nowadays but at the beginning of the mission it was left off or on auto *VO is automatically turned on by the rover under certain conditions). The odometer reports the overall distance traveled by the center of the vehicle which is obviously different from the odometer for each wheel (a turn-in-place counts as zero meters).
Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jul 23 2017, 11:18 PM
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#5
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Member Group: Members Posts: 910 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
Hello Glevesque,
Here is the data that I use for my MSL route map kmz (Google Earth) file. I hope it helps. -------------------------------------- Salut Glevesque, Voici les donnees que j'utilize dans mon fichier kmz de la route de MSL (Google Earth). Je souhaite qu'ils te seront utiles. --------------------------------------- Fernando MSL_KML.txt ( 1.75K ) Number of downloads: 805 Km Sol Earth Date Information sources 1 335 16-07-2013 Analyst's Notebook entry for Sol 336 2 365 16-08-2013 Analyst's Notebook entry for Sol 365 3 406 27-09-2013 Analyst's Notebook entry for Sol 404 and 406 4 436 28-10-2013 Analyst's Notebook entry for Sol 438 5 540 11-02-2014 Analyst's Notebook entry for Sol 542 6 574 18-03-2014 Analyst's Notebook entry for Sol 575 7 655 10-06-2014 Analyst's Notebook entry for Sol 655 8 670 24-06-2014 Analyst's Notebook entry for Sol 670 9 735 31-08-2014 Analyst's Notebook entry for Sols 735-751 https://www.nasa.gov/press/2014/september/n...n/#.VBRvNWRdVVt 10 957 16-04-2015 Analyst's Notebook entry for this day gives total distance as 10231m,however NASA/JPL press report below states the 10km mark was passed on this date https://www.jpl.nasa.gov/news/news.php?feature=4556 11 1094 04-09-2015 Analyst's Notebook entry for Sol 1094 12 1248 09-02-2016 https://astrogeology.usgs.gov/news/astrogeo...rs-and-counting However Analyst's Notebook entry for sol 1248 mentions "12305 Odometry" 13 1376 19-06-2016 https://mars.nasa.gov/multimedia/images/cur...on-for-sol-1376 14 1448 01-09-2016 https://mars.nasa.gov/multimedia/images/cur...on-for-sol-1448 15 1526 21-11-2016 https://mars.nasa.gov/multimedia/images/cur...on-for-sol-1526 16 1666 13-04-2017 https://mars.nasa.gov/multimedia/images/201...on-for-sol-1666 17 1754 13-07-2017 https://mars.nasa.gov/msl/mission/mars-rove...-behind-the-sun ................................................................... |
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Jul 24 2017, 04:00 PM
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#6
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
How about this one : http://www.curiositymsl.com/tracking/drivelog.html Note the glitch on Sol 967 of unresolved cause, which suggests a drive of 346.56 m. The map is displaced since then. |
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Jul 24 2017, 08:49 PM
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#7
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Senior Member Group: Members Posts: 2429 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 |
Note the glitch on Sol 967 of unresolved cause, which suggests a drive of 346.56 m. The map is displaced since then. Joe used to periodically (manually) adjust the drive distances / path, to bring his map in line with the actual path. It appears to been quite some time since he carried out maintenance on the page as other functions such as 'Map It' that relied on his mapping function can no longer be used. I still use his page for other activities such as the camera pointing info and image sorting. |
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Jul 25 2017, 12:24 PM
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#8
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Member Group: Members Posts: 122 Joined: 19-November 14 From: Québec Member No.: 7339 |
thank you very much nogal !
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Jul 25 2017, 05:04 PM
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#9
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
There is also a lot of information available in the PLACES database:
https://pds-imaging.jpl.nasa.gov/data/msl/MSLPLC_1XXX/ Unfortunately, while it includes positions, it does not include drive odometry. You can get some of that from Vasavada et al. papers: http://onlinelibrary.wiley.com/doi/10.1002...004622/abstract -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jul 30 2017, 05:05 PM
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#10
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Member Group: Members Posts: 910 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
One more thing I'd like to add: The PLACES database - on which most of Curiosity's route map for my GE file is based - includes for each location entry the (x,y,z) distances to the landing location.
Thus it would seem that computing the 3D distance between two successive locations would give that segment's length, and that adding all of the segments would allow computing the total traveled distance. Here is a table of the sols in which each km was crossed (up to km 15, the latest covered by PDS release 14) and a comparison with the previously posted table. As can be seen, there are some differences, sometimes large, and I don't know why. I'd be indebted if anyone can provide an explanation, by posting it here or by PM. Cheers ... Sol..... Sol Sol Computed External 1 335 335 2 369 365 3 406 406 4 437 436 5 546 540 6 589 574 7 657 655 8 672 670 9 743 735 10 956 957 11 1080 1094 12 1196 1248 13 1357 1376 14 1438 1448 15 1514 1526 |
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Jul 30 2017, 06:35 PM
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#11
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
One more thing I'd like to add: The PLACES database - on which most of Curiosity's route map for my GE file is based - includes for each location entry the (x,y,z) distances to the landing location. Thus it would seem that computing the 3D distance between two successive locations would give that segment's length, and that adding all of the segments would allow computing the total traveled distance. .... It depends on what you mean by traveled distance. Places only reports the coordinates of each stopping location and connecting each stop with a straight line would not take into account the swerving and turns we typically do while driving the rovers. This is especially true in rough terrain. The odometer that JPL typically reports does take that into account. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jul 31 2017, 02:03 PM
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#12
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Member Group: Members Posts: 122 Joined: 19-November 14 From: Québec Member No.: 7339 |
Note the glitch on Sol 967 of unresolved cause, which suggests a drive of 346.56 m. The map is displaced since then. J'aimerais également comprendre d'ou vient la différence de calcule sur la distance journalière parcourus entre ses deux sites : Exemple pour le Sol 406 : 72,94 mètres pour http://www.curiositymsl.com/tracking/drivelog.html 66,8 mètres pour http://www.midnightplanets.com/web/MSL/sol/00406.html (cumulatif) _______________________________________________________________________ I would also like to understand where the difference in the daily distance traveled between its two sites is calculated: Example for Sol 406: 72,94 mètres for http://www.curiositymsl.com/tracking/drivelog.html 66,8 mètres for http://www.midnightplanets.com/web/MSL/sol/00406.html (cumulatif) -------------------- |
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Jul 31 2017, 05:22 PM
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#13
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Member Group: Members Posts: 910 Joined: 15-June 09 From: Lisbon, Portugal Member No.: 4824 |
It depends on what you mean by traveled distance. Many thanks for your reply, Paolo. Appreciated. Wouldn't including the twists and turns - which, to me, seems the correct thing to do - make the odometry grow faster and, thus, crossing the km mark earlier? This seems to be the case up to km 10 (comparing the two columns) but not afterwards. As a curiosity: the average segment size is 0.9024 m with a standard deviation of 0.6396 I'm sticking to the JPL announcements Fernando |
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Jul 31 2017, 06:19 PM
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#14
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Member Group: Admin Posts: 976 Joined: 29-September 06 From: Pasadena, CA - USA Member No.: 1200 |
Many thanks for your reply, Paolo. Appreciated. Wouldn't including the twists and turns - which, to me, seems the correct thing to do - make the odometry grow faster and, thus, crossing the km mark earlier? .... As a curiosity: the average segment size is 0.9024 m with a standard deviation of 0.6396 I'm sticking to the JPL announcements Fernando Yes, it should but in cases where we had a very high value of slip that might have not been accounted for by the on-board software, or because of accumulated errors in position estimate, the rover might think it has moved more than it actually did so periodically Tim Parker (our resident Phil Stooke) re-localizes the vehicle position, and that's what it is poked in PLACES. While MSL has a better definition of rover odometry than MER it is still not uniquely defined. As the saying goes "a man with a watch knows what time it is, a man that has two is never sure!" Regarding the average segment length, I actually never measured it. This also would require a definition of what "straight line segment" actually means. I typically use the Pavlidis algorithm to define a straight line segment and set the tolerance to 10% (if the width of a set of points is within 10% of the length of the path, I call is a straight segment). If I have some spare time, I will run some numbers. Paolo -------------------- Disclaimer: all opinions, ideas and information included here are my own,and should not be intended to represent opinion or policy of my employer.
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Jul 31 2017, 11:56 PM
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#15
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Solar System Cartographer Group: Members Posts: 10170 Joined: 5-April 05 From: Canada Member No.: 227 |
"our resident Phil Stooke"
Inside every Phil Stooke is a Tim Parker trying to get out (I have TARDIS-like qualities) I am studiously avoiding this discussion (oops, until now) because it's so difficult to sort out exactly what these distances mean. I don't think we can definitively answer the simple-sounding question 'how far has the rover moved', not to everybody's satisfaction. Any distance flags I put on my maps are only approximations. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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