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The power of HiRISE
Stu
post Oct 9 2008, 08:04 PM
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Busy preparing a new Outreach talk here, and have been trying to find some images to illustrate the "power" of HiRISE for a non-technical audience. Playing about with - sorry, carefully looking at the images on - the addictive Mars Global Data site I found a cute landslide on Xanthe Terra that does the trick nicely. Using the IAS Viewer you can zoom in on the boulders carried down the slope by the landslide and even see cracks and splits in them... unbelievable...! blink.gif

Attached Image


Anyone else got any fave examples?


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stevesliva
post Oct 9 2008, 09:20 PM
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Emily's series about White Rock is good, too. wink.gif

(Course now that I go looking, it might not have gotten to HiRise!)
http://www.planetary.org/blog/archive/35/
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elakdawalla
post Oct 9 2008, 09:35 PM
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I did -- but you remind me I promised to wrap this up, and I haven't delivered on that promise yet...
http://www.planetary.org/blog/article/00001419/

--Emily


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Stu
post Oct 9 2008, 10:29 PM
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Yep, Emily's "White Rock" sequence is an outstanding piece of work, to be sure. I'm not comparing this Xanthe sequence to it at all; I was just struck by the detail visible in those shattered rocks smile.gif


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mchan
post Oct 10 2008, 03:14 AM
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As in Emily's presentation, consider adding scale bars to the images?
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Fran Ontanaya
post Oct 10 2008, 08:10 AM
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Spider:
http://hirise.lpl.arizona.edu/PSP_003087_0930

The famous avalanche:
http://hirise.lpl.arizona.edu/PSP_007338_2640

Rolling stones:
http://hirise.lpl.arizona.edu/images/2008/...47_1895_cut.jpg

Frost covered gullies:
http://hirise.lpl.arizona.edu/PSP_001552_1410


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AndyG
post Oct 10 2008, 08:48 AM
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QUOTE (Fran Ontanaya @ Oct 10 2008, 09:10 AM) *


I've not seen the image on the right before - I make that an Evel Knieval-like ~17m jump across the crater. Imagine being sat in the bottom of that as a 4m rock zips over your head... blink.gif

Andy
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peter59
post Nov 28 2008, 09:08 PM
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I found another unusual boulder track. You can see clearly how increased speed of the boulder on the slope. Jumps were increasingly longer, even a few dozen meters.

Hills Northeast of Mojave Crater (PSP_008430_1895) - general view
Attached Image

Hills Northeast of Mojave Crater (PSP_008430_1895) - "Rolling Stone"
Attached Image

Boulder in the final position

Attached Image

I was very skeptical before Mars Reconnaissance Orbiter mission. Another mission to Mars similar to the Mars Global Surveyor mission, what's interesting in this. I was wrong, MRO is the ultimate achievement in the field of imaging of Mars from orbit.


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charborob
post Nov 28 2008, 09:23 PM
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Judging from the freshness of the tracks, this event must have happened quite recently. Did MRO by any chance image this area before?
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Nirgal
post Nov 28 2008, 11:18 PM
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QUOTE (peter59 @ Nov 28 2008, 10:08 PM) *
MRO is the ultimate achievement in the field of imaging of Mars from orbit.


Yes, Absolutely. MRO almost "feels" more like viewing the martian landscape out of a helicopter window than from orbit ...

When I was younger I have always been dreaming about future Mars missions involving balloons or airplanes and wondered how phantastic a feeling it would be to view all the images and vistas those aircrafts would take from above ... finally bridging the gap in scale between the ground level images of the landers (Viking) and the very low resolution views of the orbiters ... Now we don't have martian airplanes yet but we have MRO ... and it's even better for it's global scope of operation smile.gif
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ilbasso
post Nov 29 2008, 04:33 AM
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I would love to see an anaglyph of that scene!


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OWW
post Nov 29 2008, 01:37 PM
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QUOTE (Nirgal @ Nov 29 2008, 12:18 AM) *
Yes, Absolutely. MRO almost "feels" more like viewing the martian landscape out of a helicopter window than from orbit ...


Interesting thought. Is there a way to calculate at what altitude a human (eye) has the same resolution as HiRise? Is it comparable to a helicopter flight or looking down through the clouds from an airliner?
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RoverDriver
post Nov 29 2008, 03:21 PM
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QUOTE (OWW @ Nov 29 2008, 05:37 AM) *
Interesting thought. Is there a way to calculate at what altitude a human (eye) has the same resolution as HiRise? Is it comparable to a helicopter flight or looking down through the clouds from an airliner?



Assuming that the human eye visual acuity is about 0.59 arc min and HiRISE at 0.25m/pixel you get an altitude of about 1456m or about 4800' (if I did my math correctly).

Paolo


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Tman
post Nov 29 2008, 03:48 PM
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QUOTE (peter59 @ Nov 28 2008, 10:08 PM) *

Attached Image

What's circa the size of that boulder? 3x4 meters?


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hendric
post Dec 1 2008, 10:33 PM
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There was some concern before that HiRise's resolution would actually be greater than the Mars atmosphere would allow due to twinkling. Has anyone taken a look at that again? What's the new maximum theoretical resolution from orbit? Less than 5cm?


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