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Help searching HiRISE images
RobertEB
post Mar 9 2009, 07:30 PM
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Does anyone know if HiRISE images are available on a click-able Mars map, similar to the way MOC images are?

I am trying to find any HiRISE images in these two locations;

North Syrtis Major Area

West Hellas Planitia Area

All I can find is a search by theme feature.

Thank you.


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Fran Ontanaya
post Mar 9 2009, 07:49 PM
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The HiRISE Online Image Viewer has some of them:
http://marsoweb.nas.nasa.gov/HiRISE/hirise_images/

If you click Search at the HiRISE site you can search by coordinates.



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Stu
post Mar 9 2009, 07:50 PM
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Here you go...

http://global-data.mars.asu.edu



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RobertEB
post Mar 9 2009, 08:38 PM
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Thank you Fran and Stu. That is what I am looking for.

I searched like crazy to find something like that, but had no luck.

Robert


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Stu
post Mar 9 2009, 08:47 PM
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You're welcome. That site I linked to is dangerously addictive tho... I like to go on there and play "HiRISE Lucky Dip": just click on random red squares representing a HiRISE image and see what appears. I've found some of my favourite places doing that. smile.gif


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elakdawalla
post Mar 9 2009, 09:14 PM
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Yeah, it's amazing to me how ill-publicized that website is, given how incredibly useful it is. I can't remember anymore how I stumbled on it myself but I'm sure glad I did! My only criticism of the site, and it's a minor one, is that you can't (as far as I know) use it to locate any of the Mars missions images of places other than Mars, like Phobos and Deimos.

--Emily


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RobertEB
post Mar 9 2009, 09:19 PM
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This image is close to my top link

Ten years ago, I was searching MOC images for hot springs. That one MOC above was the closest I could find. It has all these interesting looking channels that appear to originate from craters. I have been hoping the HiRISE imaged that same area so I can get a closer look.

I even sent in a request to the MOC team that they get more images of the site. They eventually got me some more images, but I still couldn't resolve what those channels are.

I'll have to study this new image. It is not exactly where that other one was taken, but it is close and has some of the similar features.

I notice it is a potential MSL Lander site. I would love to see it explore this area. There is some very interesting geology here.


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RobertEB
post Mar 9 2009, 09:32 PM
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This HiRISE image is close to my second one.

Deep in the depth of the Hellas Basin, where temperatures and pressure sometime gets to where liquid water can briefly exist, lies a terrain that looks like it has been twisted in a taffy machine.

Are we looking at sedimentary layers that were twisted and metamorphised by the impact that create Hellas? This landscape has puzzed me for some time. I would love to see a Rover explore this area.

There are a lot of HiRISE images in this area I want to study.


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RobertEB
post Mar 9 2009, 09:39 PM
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I am embarrassed to say I don't know how to read what the color represents in the HiRISE color images.

What does the blue represent, about 1/3 the way down this photo?


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RobertEB
post Mar 9 2009, 09:43 PM
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There is a 3rd area of Mars that fascinates me. Its just to the north of that first image I posted. I see many features that remind me of glaciers. It is in this area. Unfortunalty, it doesn't look like HiRISE has taken many pictures here. I'll have to study those that it has taken.

Lots of new pictures for me to dive it. smile.gif



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djellison
post Mar 9 2009, 09:47 PM
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It doesn't represent anything.

From the HiRISE FAQ - http://hirise.lpl.arizona.edu/faq/

"What do RED, BG, and IR mean?
These are shorthand titles for the different types of CCDs HiRISE has. The HiRISE camera has three different color filtered CCDs: red ("RED"), blue-green ("BG"), and near-infrared ("IR"). The wavelengths of these filters are as follows: RED: 570-830 nanometers BG: <580 nanometers IR: >790 nanometers


What are the BG and IR EDRs, and How are They Different from RED?
There are ten RED CCDs, two BG CCDs, and two IR CCDs. Combining the images taken by the three different color filters allows us to create "false" color images. The BG and IR CCDs are aligned with the center two RED CCDs, providing a two-CCD-wide color swath. This means that the images captured in the BG and IR products are aligned with the images captured in the RED4 and RED5 CCDs.


What does “false color” Mean?
"False" color means that the color you see in HiRISE images is not the "true" color human eyes would see on Mars. This is because the HiRISE camera views Mars in a different part of the spectrum than human eyes do. Nevertheless, false color imagery is extremely valuable because it illuminates the distinction between different materials and textures."
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imipak
post Mar 9 2009, 10:06 PM
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QUOTE (Stu @ Mar 9 2009, 08:47 PM) *
dangerously addictive


Wow. When this is your first pick - yes, I can see "addictive", alright:

http://hirise-pds.lpl.arizona.edu/PDS/EXTR...RED.abrowse.jpg

Lateral moraines, yes?


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ElkGroveDan
post Mar 9 2009, 10:12 PM
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QUOTE (imipak @ Mar 9 2009, 02:06 PM) *
Lateral moraines, yes?


Indeed, my first thought too. I can't imagine anything else. And we are fortunate to be able to skip the debate over "was there ever ice on Mars."


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dvandorn
post Mar 10 2009, 01:03 AM
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QUOTE (RobertEB @ Mar 9 2009, 03:32 PM) *
This HiRISE image is close to my second one.

Deep in the depth of the Hellas Basin, where temperatures and pressure sometime gets to where liquid water can briefly exist, lies a terrain that looks like it has been twisted in a taffy machine.

Are we looking at sedimentary layers that were twisted and metamorphised by the impact that create Hellas? This landscape has puzzed me for some time. I would love to see a Rover explore this area.

You and me both!

To me, this looks like Hellas was once situated on or near a pole. That looks like the polar layered terrain, except that all the ice has been removed. You see a lot of that taffy-like look at the edges of some of the polar layered terrain, it's highly reminiscent of these images of Hellas.

I would be very, very skeptical of the idea that you're seeing old terrain that used to underlie Hellas. When a basin that large is formed, you pretty well demolish the entire target, sometimes to depths well into the mantle. These landforms are far more well preserved than anything I would expect to see underneath the basin floor. Also, on Mars, a basin like this would fill in over time, not be continually scoured down to below the original basin floor. I'd almost have to believe that anything we see on the floor of Hellas has been deposited since the basin's formation.

-the other Doug


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Phil Stooke
post Mar 10 2009, 12:07 PM
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Quite right, Doug... and another point - very few impact craters. Compare this with a HiRISE image of Gusev, where there are craters everywhere on the plains. This is a young site.

Phil


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