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LROC news and images
Stu
post Jul 6 2009, 03:56 PM
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Crop from image http://wms.lroc.asu.edu/lroc_browse/view/iom20090703 shoing some nice boulders around a crater...

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Guest_Sunspot_*
post Jul 6 2009, 05:42 PM
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Hmmmm that zoomify image doesn't load anymore
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Stu
post Jul 7 2009, 05:55 AM
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Quite a few pics up now...

http://wms.lroc.asu.edu/lroc_browse

"Zoomify" is working fine for me here right now...


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djellison
post Jul 7 2009, 07:59 AM
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Is it just me, or - when loading the TIF's at full res, there appears to be some sort of interlacing (vertically). i.e. one column of pixels is bright, the next dark..bright, dark etc etc.

Attached zoom from http://wms.lroc.asu.edu/lroc_browse/view/nacl00000145

I guess some sort of adaptive amplification to create a pseudo enhanced dynamic range might be involved....or it might be a processing error, or it might be just something to do with the TIF's.

You can sort of back it out with some VERY rudimentary Photoshopping (doesn't quite get the shadows...someone cleverer than I could do it). I'd expect proper calibration (which is, after all, the point of these early images) would eliminate it. I found a different chunt and had a go at it
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ugordan
post Jul 7 2009, 09:18 AM
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Definitely looks like something a flatfield (or possibly a dark model) would fix so I wouldn't worry about it much. Reminds me a bit of the awful dark current noise in VIMS visual channel.


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kenny
post Jul 7 2009, 11:27 AM
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Rim of Anaxagorus A

About one third of the way down from the top of this frame is a truly gigantic boulder with a very smooth sun-facing side, triangular or diamond in shape, casting a very long shadow.
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SpaceListener
post Jul 7 2009, 01:56 PM
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Nice pictures. The most intriguing thing is that the skin of elephant is very common on the Moon surface. In spite of the fact, these might be originated by any kind of erosion that happens in the Earth.

I seems that they might be occurring when the below surface might have fractures where the regolith sink and it is smoothed by the solar bombard of particles. The others suppositions are that the boulders caused by the impacts are rounded or disintegrated by the solar influence after thousands millions years. Hope this mystery would be cleared up soon.
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mcaplinger
post Jul 7 2009, 03:01 PM
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QUOTE (djellison @ Jul 6 2009, 11:59 PM) *
Is it just me, or - when loading the TIF's at full res, there appears to be some sort of interlacing (vertically). i.e. one column of pixels is bright, the next dark..bright, dark etc etc.

As with CTX and MOC, even and odd pixels go through separate signal chains and the offset between them is still being adjusted in these early images.

BTW, the story of how we were able to make NAC run almost 4x faster than CTX with only minimal changes to the hardware is yet to be published smile.gif


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SpaceListener
post Jul 7 2009, 03:16 PM
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Useful link to ubicate where is LRO?
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Stu
post Jul 7 2009, 03:19 PM
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Quite impressive pinnacles and spikes around Anaxagoras A...

Attached Image


How high is this feature, anyone?

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PDP8E
post Jul 7 2009, 04:49 PM
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QUOTE (Stu)
How high is this feature, anyone?


back of the envelope, right triangle problem...
~50 pixels long shadow at 2 meters per pixel resolution == 100Meters shadow...low sun angle (?) degrees
(shadow may be running on a downhill slope, making it longer...)

my guess is 4-8 meters tall (WAG)



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mcaplinger
post Jul 7 2009, 05:05 PM
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QUOTE (Stu @ Jul 7 2009, 07:19 AM) *
Quite impressive pinnacles and spikes around Anaxagoras A...

Beware anomalist thinking. The sun angle is likely to be so low that these could well be quite ordinary boulders or clumps. Without knowing the sun angle and even the local topography, you just can't tell.


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Paul Fjeld
post Jul 7 2009, 05:59 PM
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QUOTE (djellison @ Jul 7 2009, 02:59 AM) *
Is it just me, or - when loading the TIF's at full res, there appears to be some sort of interlacing (vertically). i.e. one column of pixels is bright, the next dark..bright, dark etc etc.

I noticed that on a couple of the images but not all. More interesting is that the Zoomify image on the LROC website doesn't show that artifact.

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djellison
post Jul 7 2009, 06:23 PM
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Zoomify does....but it only zooms to 100%. If you screen grab and zoom in more - the same effect is in there.
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Stu
post Jul 7 2009, 06:39 PM
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QUOTE (mcaplinger @ Jul 7 2009, 06:05 PM) *
Beware anomalist thinking.


Anomalist? Moi?! ohmy.gif ohmy.gif ohmy.gif How VERY dare you!!! laugh.gif

Why, I'm a monolith of scientific scepticism! tongue.gif

Point taken.

Still cool pics tho. cool.gif


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