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The power of HiRISE
helvick
post Dec 23 2010, 06:56 PM
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Well the info lists PSP_003317_1975 as an anaglyph product for the image this enhanced clip has been taken from so one of the wizards here might be able to reprocess both similarly and then produce an anaglyph, the convergence angle looks pretty high to me but I'll let others comment on whether that makes this unusable or not.
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ElkGroveDan
post Dec 23 2010, 06:59 PM
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This is the link to the full anaglyph image.

Even without the enhancement it should be not a problem to calculate the depth of the bright sunlit segment.


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djellison
post Dec 23 2010, 08:59 PM
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QUOTE (SteveM @ Dec 23 2010, 08:20 AM) *
Very nice detail. Any idea of the depth of those pits?


Approx 300m across and 180m deep - I did the trig on the distance from the side to the shadow using the illumination angle some time ago.
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SteveM
post Dec 24 2010, 08:11 PM
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QUOTE (djellison @ Dec 23 2010, 03:59 PM) *
Approx 300m across and 180m deep - I did the trig on the distance from the side to the shadow using the illumination angle some time ago.
Thanks for the nice stocking stuffer. You guys are amazing.

Steve M
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antipode
post Dec 24 2010, 09:09 PM
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Its very easy to imagine the bottom of that hole continuing as a lava tube under what seems to be an overhang at the right of that image, and possibly all the way through to the left hand side. May be an illusion of perspective and lighting though.

p
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OWW
post Jan 12 2011, 12:52 AM
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Weird looking terrain in the latest PDS release.

Similar to the terrain in western Hellas or not?
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JohnVV
post Jan 12 2011, 02:44 AM
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"Weird looking terrain in the latest PDS release."

it's odd but then this is Libya
http://spaceflight.nasa.gov/gallery/images...s018e014770.jpg
http://www.spaceref.com/news/viewsr.html?pid=30394
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tharrison
post Jan 12 2011, 05:11 PM
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QUOTE (OWW @ Jan 11 2011, 04:52 PM) *
Weird looking terrain in the latest PDS release.

Similar to the terrain in western Hellas or not?


No, the landforms in ESP_020058_1865 are thought to be lithifed aeolian dunes that have been partially eroded. This is seen in multiple places around Arabia Terra. That HiRISE image was actually a case where we here on the CTX science ops team saw that terrain in a CTX image and then specifically asked HiRISE to shoot it for a higher-resolution look. Attached is a subframe of CTX P17_007571_1859_XI_05N335W, which covers the area of that HiRISE image (it's a little murky, as Arabia Terra is often cloudy).

No one really knows what the heck is going on in the stuff in western Hellas (referred to informally as "taffy pull terrain").

~Tanya


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lyford
post Mar 22 2011, 02:56 AM
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QUOTE
We've been quiet lately. But we have a good reason. #fb

I am a twitter about this twitter.... ???


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"Zis is not nuts, zis is super-nuts!" Mathematician Richard Courant on viewing an Orion test
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tharrison
post Mar 23 2011, 10:43 PM
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QUOTE (lyford @ Mar 21 2011, 06:56 PM) *
I am a twitter about this twitter.... ???


I'm pretty sure it has something to do with this: http://www.skyandtelescope.com/news/home/117806243.html


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marsbug
post Mar 23 2011, 11:05 PM
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For convinience here is the abstract from LPSC. It makes for interesting reading, but I suggest great caution in declaring liquid water found, much less a habitable environment. Hopefully CRISM observations will make a stronger case or put this to bed.


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sgendreau
post Mar 24 2011, 04:40 AM
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In the literature, McEwan has been a critic of wet formation mechanisms. I don't think you need worry that he'll overreach.
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marsbug
post Mar 25 2011, 11:30 AM
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Thats good to know.


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ElkGroveDan
post Apr 22 2011, 03:32 PM
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Discussion of paper on Spectral Evidence for Liquid Water on Mars, LPSC 2011, Renno and Mehta moved
HERE -> http://www.unmannedspaceflight.com/index.p...c=6949&st=0


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climber
post Aug 21 2011, 02:06 PM
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Another cave: http://www.onorbit.com/node/3681



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