Back At Larry's Lookout Options

[Bill Harris]

Wonderful-- it's my new Wallpaper, too.

What are the current thoughts on what is happening here? There is a cemented crust on the surface and a mobile subsurface. The slide area was interesting enough but the disturbed areas around the wheels are more so. And, unless I'm mistaken, I see a purple-colored subsoil like we saw on the climb up.

--Bill

[edstrick]

On Earth, sediment transport processes tend to separate sand sized (1 to 0.1 mm, roughly) sized particles from smaller silt and clay sized particles. (Geologist's operational test to tell siltstone from claystone: nibble a bit between your front teeth. If it's gritty, it's got silt sized particles, if it's smooth, it's all clay sized!) Thus Earth gets lots of relatively well sorted sandstones, and very different silt dominated sediments on land and in rivers. Clay sized dust tends to stay in suspension in the air or rivers and ends up in the oceans as a component of marine oozes.

On Mars, the globally transported dust storm dusts are mostly clay sized... a few microns sized particles, and the dark dunes in craters and the north polar sand seas do appear both visually and from thermal properties to be reasonably well sorted sand grains, but a lot of the stuff the rovers are encountering seem to be a varied assortment of clay/silt/sand and granule (2 mm or so) sized materials, with all sorts of small scale sorting going on, but not making sediments with really well defined average particle sizes.

A big reason is the lack of water and it's roles in separating the different materials mechanically, and the lack of oceans to trap the eolian transported dust. A big question polar lander was to help answer and Phoenix will tackle is the nature of high latitude "dust and ice" deposits. The Polar Lander's targets are true polar deposits, it's unclear what the dirty ice (inferred from Odyssey's data) are that Phoenix is targeted for.

[dilo]

I integrated part of previous Larry's mosaic with more recent color images from PanCam and identified their location inside a "colorized" Sol507 NavCam stitch:

As a bonus, in the top/left insert there is also a portion of relatively rare full NavCam picture of a DD from the same day (as you know, most DD appear in subframes images... ).

[Tesheiner]

Beautiful mosaic Dilo.
Great work!

I made a pano of Sol 507 too (using autostitch), but your composition beats it by an order of magnitude.

Tesheiner

[Nirgal]

great work, dilo !

makes me all the more looking forward to the images/mosaics to come with the
new terrain we are about to discover in the next weeks

[aldo12xu]

Awesome work Dilo! And a great idea pointing out the locations of the different rock targets.

[jvandriel]

Here is a panoramic view of Jibsheet, Gusev Crater and Larry's Lookout taken with the L7 pancam.
The horizon is not perfect but this is the best result from Autostitch.
The original view is 21 MB. made from 48 pictures.

jvandriel

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[jvandriel]

Here is a panoramic view of Gusev Crater with a good and straight horizon.
Panorama taken with the L5 Pancam.

jvandriel

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[dilo]

Nice works, jvandriel.
I made similar mosaic from Sol510 pseudo-color images and, even if result is far from perfection, it still impressive:


OT quesstion: Do someone knows how to obtain flat horizon, force stitch of all image and eliminate luminosity differences inside autostitch, without image pre-processing? (if yes, pls, answer in the "Imagery & Tech Issues", where I just posted same question).

[jvandriel]

Dilo,
here is my version of the panoramic view of Tennesee Valley and Larry's Lookout.
Taken on sol 510 with the L5 Pancam.

It is in black and white. Your colour panorama is more spectacular.

jvandriel

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[jvandriel]

Here is a better panoramic view of Larry's Lookout and tennesee Valley after changing the Gain parameter in Autostitch.

jvandriel

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[dilo]

Dilo,
here is my version of the panoramic view of Tennesee Valley and Larry's Lookout.

I see, huge stitch but as usual there is bad uniformity issue... now I discovered how to eliminate it and, thanks also to your suggestions... voilà:

Read the other thread to know settings I used!

[Bob Shaw]

Dilo:

Excellent work!

(and youse other guys, too!)

Bob Shaw

[dilo]

Thanks, this is a beautiful example of successful world-wide collaboration between individuals which do not know each other, but share the same passion!

[Phil Stooke]

Yes, Dilo, we are getting a lot of that here, and it is good to see it.

Phil