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Vera Rubin Ridge
PaulH51
post Aug 15 2017, 01:25 PM
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The best I could pull out of MS ICE. L-NavCam 1786. Midnight Planets reports the point to point drive as ~16.0m NE (39)
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jvandriel
post Aug 15 2017, 02:19 PM
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The Navcam L view on Sol 1785.

Jan van Driel

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jvandriel
post Aug 15 2017, 04:54 PM
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and the view on Sol 1786.

Jan van Driel

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Phil Stooke
post Aug 15 2017, 06:37 PM
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Thanks, Jan and Paul. This is Jan's panorama in circular form. The drive probably terminated as the wheels were negotiating a rocky mound here. It's actually very surprising that this doesn't happen more often!

Phil

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RoverDriver
post Aug 15 2017, 07:13 PM
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QUOTE (Phil Stooke @ Aug 15 2017, 11:37 AM) *
...
It's actually very surprising that this doesn't happen more often!


We try to avoid these things. Whenever the surface topography is this extreme, the reconstructed surface has "holes" due to occlusions which prevents us from accurately simulating attitude and suspension values during a drive. Sometimes we have no choice, we have to drive through holes (holy drives?) and we spend considerable amount of time to decide which holes to visit. End of drive positions are chosen also to maximize visibility and reduce occlusions in the intended drive direction.

Paolo


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PaulH51
post Aug 16 2017, 10:10 AM
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QUOTE (RoverDriver @ Aug 16 2017, 03:13 AM) *
We try to avoid these things....
Paolo

Thanks for the insight Paolo, much appreciated smile.gif

Looks like they captured the culprit in this sol 1787 mid-drive NavCam image looking back to where yestersols drive halted. Appears to be a loose block that was moved by the rover's wheels.
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PaulH51
post Aug 16 2017, 10:35 AM
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The roughly assembled L-NavCam partial pan using MS ICE that may help pinpoint the location until the full version is posted here. As usual, feel free to delete this post once full pan is posted.
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RoverDriver
post Aug 16 2017, 04:48 PM
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QUOTE (PaulH51 @ Aug 16 2017, 02:10 AM) *
...
Looks like they captured the culprit in this sol 1787 mid-drive NavCam image looking back to where yestersols drive halted. Appears to be a loose block that was moved by the rover's wheels.
...


What happened is that the newly developed traction control software interpreted the local topography as a "wheelie" (*) and tried to correct it but failed to do so. While the available torque is Bugatti-Veyron class (really!), it still cannot change Mars topography.

Paolo
(*) wheelies on Mars happen when either the mid or rear wheels are raised from the surface due to difference in traction. While driving forwards, if the rear wheel has more traction than the front, the mid wheel can be raised. Vice-versa, while driving backwards if the front wheels have more traction that the mid, the rear wheels can come up. Keeping all wheels on the surface increases overall traction and reduces stress on the wheels and rover planners.


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jvandriel
post Aug 16 2017, 07:24 PM
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The Navcam L view on Sol 1787.

Jan van Driel

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jvandriel
post Aug 17 2017, 06:53 PM
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The Navcam L view on Sol 1788.

Jan van Driel

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atomoid
post Aug 17 2017, 10:41 PM
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here are a couple corsseye views of m34/m100 pairs on sol1782 and sol1787
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PaulH51
post Today, 12:03 PM
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Partial RMI mosaic (sharpened) of VRR, acquired on sol 1790.
Sadly one of the images in the sequence had data drop out, so MS ICE could not be convinced to assemble all of the available images.
Even though incomplete, it gives us a fairly good look at the stratigraphy of this section of the ridge... If they resend the errant frame I'll try to assemble the complete mosaic. smile.gif
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