If it's a problem I'm more than happy to host the maps.

My site has a file upload feature that I could give Tesheiner access to. Then he could just link to it here without taking up space.

http://www.nivnac.co.uk/media/users/james/...ol1659.new1.jpg

James

I reckon you could get away with that context map being 1/4 the size it currently is and added as an insert in the corner so as to not increase the image size.

Manageable JP2's or another format?

I'm going to be splitting the JP2 into smaller JP2's for processing and could put them on line If required. I don't know much about converting them to other formats though - especially if you want to keep the full 16bit depth.

James

I don't see any gross errors made by mine, but if anyone spots any bad points then let me know. I was using a very simple extraction of data from the Fourier power spectrum so I'm sure there is room for improvement. Determining what is a useful measure is not easy however, so pointers to problematic areas would be useful.

Hopefully I'll have a LOT more data for you to look over this evening (GMT) - maybe even an entire HiRISE image!

James

Great work with the variance method, amazing.

I've just about got my Fourier method working. Here is a strip of the HiRISE image I've been testing on, chosen as it has some serious ripples on the left and very small ones on the right.



Looks pretty good so far

James

Yeah, what I didn't mention is the input for those plots was an average of 5 pixels N-S not just a 1x256 E-W slice.

I'll be experimenting later, but my current thinking is to run this FT on 8x256 sections then take some average of something (waves arms) over 32 slices to get "characteristics" for a 256x256 pixel square. Will probably also need to factor in the pixel brightness statistics which should help find areas with exposed bedrock.

Then I just need to get it to pick out and mosaic areas with similar "characteristics" and we can see what works best. (or if it works at all!)

Oh and to pick up on what others have said - I agree, running this it on the Endurance -> Victoria terrain is an essential test.

James

Yes, that is what I was thinking.

I've started doing Fourier transforms on 256 pixel (east-west perpendicular to the ripples) slices and have confirmed to myself that I can at least detect ripples. e.g.

No ripples:

Most of the power is on large scales

Ripples:

Big peaks at 10-15 pixels (the scale of the ripples)

I'm sure the signature will change significantly as the ripple size changes. It's bedtime for me now, but tomorrow I'll put the code in place to run these FT's over the whole image and then make maps of various characteristics of the Fourier profiles generated.

James

Well just to update you on my progress (less than I hoped as I have a lot on at the moment). I'm now able to load chunks of the JP2 into a C++ program and am going to attempt to get it to recognize different ripple sizes, probably with some sort of Fourier analysis.

No promises though, it maybe too hard given for very limited amount of time I have to work on this.

I can't remember this very well so I could be wrong, but I seem to remember doing some analysis that suggested that that was a feature on the far rim. So where we are going is even closer.

James

-- Just trying to work out how to load jpeg-2000 images using a decent programming language with the aim of finding ways of classifying ripples automatically.

This bright ripple they are trying to get stuck in is now called "Bagnold"

I fixed your broken quote chuckclark.



I don't have Google earth at work but if IRC you can exaggerate the vertical scale if you wish.

Does the WCL even have a vibrating hopper? First I've heard of it.

If they were to try something like this, I would imagine it would be one of the last planned activated with the arm to minimise the risk if it all went horribly wrong.

Images of storms are rather off topic for this thread, i've moved them to a new one:

Storms from Orbit

I think that is what Ted is suggesting people 'have a crack at'. Process the data to make pretty images we can all look at.

It's been a long time since I touched any HST data, I may have to have a look to see if I can dust off any old scripts.

James

Animation of the recent dumping activity on WCL.

if I mention it again, do I win a prize for Connect 4?

I'm not sure, "Bright Patch 2" is as your image link shows, right in front of Oppy. Could "Bright Spot" be the "bright_dust" sequence taken on sol 1641:

http://marsrovers.jpl.nasa.gov/gallery/all...4P2442R2M1.HTML

The drive yestersol (1648) was a short one in this direction, so this looks like it may be the next target. (Next drive is tomorrowsol (1650))

I haven't dug up the references but there are two listed in the Wikipedia entry for Kārlis Šteins the Latvian astronomer, linking him to 2867 Šteins.

The Phoenix Twitter seems to backup the part of this story regrading filling up all the ovens ASAP.

Tracks. New, old and older.



And now, since Doug has very kindly sent me some 3D glasses (Thanks very much Doug! )

Colour Anaglyph.



James

I didn't bother watching the first episode last night.

I was totally put off by the programme description



Perpetuating the old myth about global cooling in the 70's

Totally incorrect:
http://www.realclimate.org/index.php?p=94
http://www.wmconnolley.org.uk/sci/iceage/
http://ams.allenpress.com/perlserv/?reques...2370.1&ct=1

Maybe this was addressed in the program, but the overview is inaccurate, either accidentally or intentionally to sensationalise the program.

[Sigh] Very disappointing from the BBC.

James

Indeed. And as for "retro space-tech" it looks a lot more modern than many bits of radio telescope hardware I've seen, much of it still in use!

Anybody else having problems with UMSF on Chrome?

I can see the front page and sub-forums but I can't read threads or 'View New Posts'.

I get an error that reads



Odd, I thought that underneath this was a Webkit browser and I have no problems with Safari.

Yes that's a camera artifact.

There are one or two non blurred moon shots, like the amazing one that doug has in his gallery (top centre).

http://gallery.me.com/djellison#100034/IMG...p;bgcolor=black