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Endeavour Drive - Drivability analysis
djellison
post Sep 18 2008, 11:05 AM
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http://www.sciencefriday.com/program/archives/200809191

You can listen via NPR, or via one of the web feeds that are listed on the site, but make sure you do listen if you can.
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djellison
post Sep 20 2008, 06:52 AM
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I'd like to see end to end HiRISE imagery before we set out - a month, maybe two - and seriously - there is still fun to be had at Victoria anyway.

How else are we going to play the part of noisy back-seat drivers?
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RoverDriver
post Sep 20 2008, 09:44 PM
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QUOTE (djellison @ Sep 19 2008, 11:52 PM) *
I'd like to see end to end HiRISE imagery before we set out - a month, maybe two - and seriously - there is still fun to be had at Victoria anyway.

How else are we going to play the part of noisy back-seat drivers?


Doug, as anticipated privately, I'm going to break out of my silent lurking. First of all let's make sure everyone understands I'm speaking for myself only, if my employer wants to speak they have their own channels and definitely I'm not one of them. That's what my signature says, and hopefully the meaning will be clear to everyone. Hopefully I won't get into trouble for posting here, I like my job and I'd like to keep it.

Speaking for myself, I did appreciate immensely the suggestions, comments and good ideas that I read on this forum. Besides keeping my morale high I picked up many good ideas from all of you. It is pretty amazing what you have been able to infer from the little information that has been released.

Is is time to hit the road. Once we extricate the rover from the current position (we tried to reach a pretty compelling science target knowing full well the likelihood of success was low) we will head for Endevour. I have seen some suggestions from you guys about paths to follow. While it is premature to analyze the terrain until we have HiRISE, I'd like to understand what was your line of reasoning behind the path, what data you used and how you made the assessment.

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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SFJCody
post Sep 20 2008, 10:53 PM
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QUOTE (RoverDriver @ Sep 20 2008, 10:44 PM) *
I have seen some suggestions from you guys about paths to follow. While it is premature to analyze the terrain until we have HiRISE, I'd like to understand what was your line of reasoning behind the path, what data you used and how you made the assessment.

Paolo


The rover driver on the forum asking us about the potential routes we've come up with! Now this is surreal. smile.gif

Anyway, for this map I took a direct straight line route from Victoria to Endeavour (using a THEMIS mosaic assembled by slinted)and split it up into 'legs' determined by terrain type. I added a kink to get the rover to a moderate sized crater ('mini-Endurance') on the grounds that it would be a good window for the project scientists to check geological heterogeneity. I put the end of the journey at the hills of the western rim as the MGS hematite map seems to (maybe possibly) show a compositional difference at the visible rim of Endeavour (both west and east), although it's difficult to be certain.

Thinking about it, though, it might be better if I had put Leg A directly due east across Victoria's annulus rather than due south. That would make Leg B through the Etched Terrain more south-trending and reduce the number of times the rover would have to cross over the ripples.

You know you have one of the best jobs in the world, right? laugh.gif wheel.gif
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RoverDriver
post Sep 21 2008, 12:54 AM
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QUOTE (SFJCody @ Sep 20 2008, 02:53 PM) *
...
Thinking about it, though, it might be better if I had put Leg A directly due east across Victoria's annulus rather than due south. That would make Leg B through the Etched Terrain more south-trending and reduce the number of times the rover would have to cross over the ripples.
...


OK, now think what would be the easiest and safest route to Endevour if you did not have to stop for science. I'm not saying we will not, not saying we will either because I do not know at this time how many and where the stopovers are. Let's get the ball (wheels) rolling and get some ideas out. Don't flood me with PMs or e-mails smile.gif , there is plenty of time to sit and think. Unless we find a way to flap the wings of Opportunity's deck it will take quite some time to go around Victoria. So far I heard we should drive CCW around Victoria and that part is already covered by HiRISE. How far from the rim would you keep the rover? Keep in mind that a couple of stops on the rim might be requested.

The reply is attached to this message but of course the question is for all of you. This is just an experiment, let's see what happens.

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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fredk
post Sep 21 2008, 04:18 PM
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QUOTE (RoverDriver @ Sep 21 2008, 01:54 AM) *
OK, now think what would be the easiest and safest route to Endevour if you did not have to stop for science... How far from the rim would you keep the rover? Keep in mind that a couple of stops on the rim might be requested.

Welcome, Paulo. It's a thrill to have a real driver acknowledge us noisy back-seat drivers!

Given the ease we've had so far driving on the anulus, I'd think we're basically "science-dominated", ie anywhere the science team decides to visit around the rim of Victoria should be easy to reach. There are some larger dunes on the eastern rim to keep an eye on, especially if the science team wants to do imaging from the rim (eg the "linear features" that've been discussed). Of course the less we advance the odometer the better.

As for the route to Endeavour, my post and route sketch from over a year ago was based on the principle of "avoid dunes whenever possible", and the hirise image PSP_001414_1780, and the hope that the tarmac continues east (I haven't seen hirise images further east). The "tarmac" to the NE appears to have the smallest dunes, but I agree that Tesheiner's route above (or a similar route that heads more directly east at first) looks not too bad, at least barring a wheel failure. A big question I have is what happens to our dune traversibility if we loose a wheel? Perhaps in that case you'd rather be on the tarmac to the NE.

It might appear that a "tarmac" route as I sketched would be longer than a more direct route to the SE, but tarmac means essentially straight drive segments, while dunes probably mean zig-zagging east when you can cross dunes, then south between dune crests, so the total distance may be much larger than the "crow flies" distance.

Perhaps there's going to have to be a mathematical expression for the "favorability", F, of a route. Greater total odometry would reduce F. Fewer and smaller dunes increase F. Better science en route increases F, especially since our arrival at the final destination is far from guaranteed! I would not like to try guess the form the expression for F would take, or how much weight to give the engineering versus science goals!

I wish you the best of luck as you embark on your greatest road trip yet!
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Posts in this topic
- djellison   Endeavour Drive - Drivability analysis   Sep 18 2008, 11:05 AM
- - djellison   Tune in now   Sep 19 2008, 06:01 PM
- - djellison   "What's next for Opportunity - time for ...   Sep 19 2008, 06:08 PM
- - djellison   Paraphrasing Squyres : QUOTE Where to now? Well...   Sep 19 2008, 06:14 PM
|- - Tman   QUOTE (djellison @ Sep 19 2008, 08:14 PM)...   Sep 19 2008, 06:30 PM
- - mhoward   NO! WAY! You guys must be pulling my leg...   Sep 19 2008, 06:52 PM
- - dvandorn   Last I checked, the date isn't April 1.... -t...   Sep 19 2008, 06:58 PM
- - imipak   Harrumble!!   Sep 19 2008, 07:23 PM
- - David S.   That's just amazing !! This is going t...   Sep 19 2008, 07:30 PM
- - paxdan   mars EXPLORATION rovers Am delighted by this news...   Sep 19 2008, 07:34 PM
|- - tedstryk   Awesome - we may not get what we want, but I'd...   Sep 19 2008, 07:44 PM
- - Pavel   That's Ithaca crater!!! It cannot ...   Sep 19 2008, 07:51 PM
|- - djellison   QUOTE (Pavel @ Sep 19 2008, 08:51 PM) Tha...   Sep 19 2008, 07:53 PM
- - vjkane   As an American taxpayer, I must say that I wish al...   Sep 19 2008, 07:59 PM
|- - odave   That was quite a show; an all-star panel plus the ...   Sep 19 2008, 08:04 PM
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- - djellison   Just got word from SS - the name Endeavour is unof...   Sep 19 2008, 08:07 PM
- - ElkGroveDan   I hate to spoil the party, but (as the saying goes...   Sep 19 2008, 08:08 PM
- - charborob   According to this old press release, the funding f...   Sep 19 2008, 08:12 PM
- - Paolo Amoroso   This is a marsathon. Paolo Amoroso   Sep 19 2008, 08:17 PM
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- - djellison   Every day? No. But back in the day - James Caird...   Sep 19 2008, 08:28 PM
- - Tesheiner   Unbelievable! Incredible! Wonderful! ...   Sep 19 2008, 08:34 PM
|- - brellis   This Big Crater fan says Yahoooo!!   Sep 19 2008, 08:46 PM
- - Paolo Amoroso   This would be the largest crater on another world ...   Sep 19 2008, 08:46 PM
- - charborob   QUOTE (Paolo Amoroso @ Sep 19 2008, 03:46...   Sep 19 2008, 08:56 PM
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|- - BrianL   QUOTE (Bobby @ Sep 19 2008, 04:54 PM) I f...   Sep 19 2008, 11:20 PM
|- - mhoward   QUOTE (BrianL @ Sep 19 2008, 05:20 PM) Th...   Sep 19 2008, 11:32 PM
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- - djellison   I'd like to see end to end HiRISE imagery befo...   Sep 20 2008, 06:52 AM
|- - RoverDriver   QUOTE (djellison @ Sep 19 2008, 11:52 PM)...   Sep 20 2008, 09:44 PM
|- - SFJCody   QUOTE (RoverDriver @ Sep 20 2008, 10:44 P...   Sep 20 2008, 10:53 PM
|- - RoverDriver   QUOTE (SFJCody @ Sep 20 2008, 03:53 PM) T...   Sep 21 2008, 12:25 AM
|- - RoverDriver   QUOTE (SFJCody @ Sep 20 2008, 02:53 PM) ....   Sep 21 2008, 12:54 AM
|- - fredk   QUOTE (RoverDriver @ Sep 21 2008, 01:54 A...   Sep 21 2008, 04:18 PM
|- - ustrax   Dear Fredk, maybe I'm missing something here b...   Sep 21 2008, 04:32 PM
- - Tesheiner   Speaking of drivers, I believe some of the real on...   Sep 20 2008, 07:08 AM
- - Astro0   ...before we set out - a month, maybe two... Didn...   Sep 20 2008, 07:16 AM
|- - SFJCody   Onwards! Anyone have any idea what the maximu...   Sep 20 2008, 07:41 AM
|- - ustrax   QUOTE (Astro0 @ Sep 20 2008, 08:16 AM) .....   Sep 20 2008, 08:38 AM
|- - djellison   QUOTE (Astro0 @ Sep 20 2008, 08:16 AM) ...   Sep 20 2008, 05:14 PM
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|- - SFJCody   QUOTE (dvandorn @ Sep 21 2008, 04:13 AM) ...   Sep 21 2008, 10:32 AM
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|- - SFJCody   QUOTE (Tesheiner @ Sep 21 2008, 11:24 AM)...   Sep 21 2008, 12:05 PM
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- - Tesheiner   Yeah, it's time for back-seat driving and here...   Sep 21 2008, 02:41 PM
|- - RoverDriver   QUOTE (Tesheiner @ Sep 21 2008, 06:41 AM)...   Sep 21 2008, 04:12 PM
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|- - Tman   In the HiRISE Online Image Viewer can you select ...   Sep 21 2008, 08:35 PM
- - mhoward   FWIW, I agree with Phil. When I looked at the MRO ...   Sep 21 2008, 08:36 PM
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