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Kilometers on the ground
Glevesque
post Jul 21 2017, 10:48 AM
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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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nogal
post Jul 31 2017, 05:22 PM
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QUOTE (RoverDriver @ Jul 30 2017, 07:35 PM) *
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 smile.gif
Fernando
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RoverDriver
post Jul 31 2017, 06:19 PM
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QUOTE (nogal @ Jul 31 2017, 10:22 AM) *
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 smile.gif
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


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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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Posts in this topic
- Glevesque   Kilometers on the ground   Jul 21 2017, 10:48 AM
- - pospa   How about this one : http://www.curiositymsl.com/t...   Jul 21 2017, 11:31 AM
|- - Glevesque   Thank you, but I think the site does not take actu...   Jul 21 2017, 11:55 AM
|- - Gerald   QUOTE (pospa @ Jul 21 2017, 01:31 PM) How...   Jul 24 2017, 04:00 PM
|- - PaulH51   QUOTE (Gerald @ Jul 25 2017, 12:00 AM) No...   Jul 24 2017, 08:49 PM
|- - Glevesque   QUOTE (Gerald @ Jul 24 2017, 12:00 PM) No...   Jul 31 2017, 02:03 PM
- - RoverDriver   The data on that web site appears to be matching t...   Jul 21 2017, 11:00 PM
- - nogal   Hello Glevesque, Here is the data that I use for ...   Jul 23 2017, 11:18 PM
- - Glevesque   thank you very much nogal !   Jul 25 2017, 12:24 PM
- - elakdawalla   There is also a lot of information available in th...   Jul 25 2017, 05:04 PM
- - nogal   One more thing I'd like to add: The PLACES dat...   Jul 30 2017, 05:05 PM
|- - RoverDriver   QUOTE (nogal @ Jul 30 2017, 10:05 AM) One...   Jul 30 2017, 06:35 PM
- - nogal   QUOTE (RoverDriver @ Jul 30 2017, 07:35 P...   Jul 31 2017, 05:22 PM
|- - RoverDriver   QUOTE (nogal @ Jul 31 2017, 10:22 AM) Man...   Jul 31 2017, 06:19 PM
- - Phil Stooke   "our resident Phil Stooke" Inside every...   Jul 31 2017, 11:56 PM
- - tanjent   Even if the slippage could be precisely accounted ...   Aug 1 2017, 01:53 AM
|- - RoverDriver   QUOTE (tanjent @ Jul 31 2017, 05:53 PM) ....   Aug 2 2017, 03:57 AM
|- - Glevesque   QUOTE (RoverDriver @ Aug 1 2017, 10:57 PM...   Aug 2 2017, 01:00 PM
|- - Glevesque   I would also like your help to trace the daily cum...   Aug 2 2017, 07:15 PM
|- - RoverDriver   QUOTE (Glevesque @ Aug 2 2017, 12:15 PM) ...   Aug 2 2017, 10:43 PM
|- - Glevesque   A big thank you for sharing his information. -----...   Aug 4 2017, 04:55 AM
- - nogal   Hello again, The discussion is this thread prompt...   Aug 17 2017, 06:11 PM


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