[X] My Assistant

[Tesheiner]

I would discard distortions of any kind.
Have a look to this previous attachment; the B&W image is not deformed/distorted but there are missing data which can be actually seen on the color pic, see for instance a little crater seen in color but missing on b&w. Remember that the color image is in part made of the *same* data from the b&w one.

> A bug in the code?

Tuvas, did you write that piece of code?

[tuvas]

Tuvas, did you write that piece of code?

Nope;-) Actually, very little of the code I've written has actually been used yet, as far as I know, only one program has been, and I didn't write it so much as fix a few bugs, and the program doesn't do anything crutial. Most of what I've done is related to HiView, the upcoming application, and there again, nothing on the front, everything lurking in the background...

[RichardLeis]

I don't fully understand the sawtooth affect myself, but I can tell you it's introduced in the Geometrically projected image stage. As to what's causing it, well, your guess is as good as mine...

Luckily, the sawtooth effect is not missing data. I do not have a good technical grasp of what happened, but it was caused by geometry processing of some observations using ISIS. Something to do with the camera model and how elevation data is handled for off-nadir images. It is not really a bug...we had to change one parameter in one of our processing pipelines to make the effect go away. ISIS will get smarter by the time PSP rolls around so that it can deal with the special situations that lead to this sawtooth effect.

[tuvas]

Luckily, the sawtooth effect is not missing data. I do not have a good technical grasp of what happened, but it was caused by geometry processing of some observations using ISIS. Something to do with the camera model and how elevation data is handled for off-nadir images. It is not really a bug...we had to change one parameter in one of our processing pipelines to make the effect go away. ISIS will get smarter by the time PSP rolls around so that it can deal with the special situations that lead to this sawtooth effect.

Glad to see it from someone who would know better than I:-)

[ustrax]

There will be no plans to search for the russian landers.

I had more curiosity on them than on the sucessful missions, just to see what we have missed...

[MarkL]

There will be no plans to search for the russian landers.

How well are their landing sites known? It might be like looking for a needle in a haystack. That said, I am keen to see if MPL really is where Malin says it is. (or isn't) And Beagle too for that matter.

[Guest_PhilCo126_*]

Although there might be no plans to search for lost landers, they could of course pop up on an image

[volcanopele]

There will be no plans to search for the russian landers.

I had more curiosity on them than on the sucessful missions, just to see what we have missed...

How well are their landing sites known? Keep in mind that with HiRISE you would have to target the image within a few km of the lander in order for it to be in the image, and I don't think their landing positions are that well know. So you would have to do a little imaging campaign, similar to what will be done to look for a good landing site for Phoenix.

[tuvas]

How well are their landing sites known? Keep in mind that with HiRISE you would have to target the image within a few km of the lander in order for it to be in the image, and I don't think their landing positions are that well know. So you would have to do a little imaging campaign, similar to what will be done to look for a good landing site for Phoenix.

I do know that the Marlin team wants to know if they saw the landers mentioned, and that would best be done with HiRISE.

As to Phoenix landing sites, well, the process would be different. Phoenix landing sites are looked for in one of several areas on Mars, of which pictures are taken, actually fairly small, but it's far from mapping the area (Although when Phoenix gets more specific areas, we might take several larger images in the area and map it out, this is speculation). Another method will be to prove the validity of other ways of estimating the number of boulders at a site, the previous missions weren't completely in the dark with these things.

Still, as I've said, HiWeb will be avaliable, and anyone will be able to request locations to take pictures, so I imagine we'll end up taking pictures of all landers (At least, successful landers, not too sure about the unsuccessful Russian ones from so long ago) soon, depending on how well known their landing spots are.

[tty]

Is that wet soil on those gully slopes?

[attachment=8126:attachment]

I don't think anyone has commented on the polygonal pattern visible in the left image. It is particularly noticeable in the lower righthand corner and looks rather similar to patterned ground in arctic/permafrost areas on Earth.

tty

[ustrax]

So you would have to do a little imaging campaign

A big one by what I've been told:"we would have to take a prohibitively large
number of photos."
Out of the basket...
For now.

[djellison]

I can't imagine being able to pin down any pre-viking lander to an ellipse less than a MER-like 80 x 15 km to be honest....and that's going to take 14 large HiRISE images to 'paint'.

Doug

[tuvas]

I can't imagine being able to pin down any pre-viking lander to an ellipse less than a MER-like 80 x 15 km to be honest....and that's going to take 14 large HiRISE images to 'paint'.

Doug

Well, as the early landers tended to land in more bland spots, it's not likely that we'll take such a picture anytime soon. 14 would be alot, it would take almost a week to download (Guessing), and that's alot of time really... I don't think the full scale pictuers with HiRISE will be taken very often. Of couse, we are trying compression schemes, which might make such a search possible, and we could try binning the cells 2x2, that would still allow for a relatively quick search, but, well...

[Guest_Sunspot_*]

I don't think the full scale pictuers with HiRISE will be taken very often. Of couse, we are trying compression schemes, which might make such a search possible, and we could try binning the cells 2x2, that would still allow for a relatively quick search, but, well...

Huh? So for most images, you won't be making use of the full resolution the camera can produce?

[nprev]

Disappointing...

Even more so in light of the fact that we could learn a lot about modern Martian erosional rates by observing the landing sites of the earliest probes. Mars 2 & 3 have been on the surface for 35 years...if we could see anything after all that time, then that might say a lot about the origin & longevity of features like the gullies. Come to that, didn't one or more of the early boosters impact Mars? You'd think that they'd leave a far more enduring impression on the landscape...

Alternatively,in the worst-case scenario, MRO might find an aureole of darker material around each crash site which after spectroscopic analysis may resemble that of an E. Coli supercolony...