The Dust Avalanche revisited in 3D, Shape-from-shading color DEM from single image |
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The Dust Avalanche revisited in 3D, Shape-from-shading color DEM from single image |
 Feb 23 2010, 07:58 PM
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#1
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Member  Group: Members Posts: 707 Joined: 30-March 05 Member No.: 223  |
I'm currently exploring the application of my single-image photoclinometric 3D reconstruction algorithm to generate DEMs for various areas of interest, in particular where we have no other (i.e stereo-imaging based) detailed 3D reconstructions yet.
One of the first areas I have always wanted to visit "from the ground" is the famous Dust Avalanche caught live in action by HiRISE. Follow this link for a small web gallery with color 3D renderings of a DEM derived from the originally published HiRISE image, rendered under various viewing positions and light source directions.  The original 2D image can be found at the HiRISE site under the observation ID PSP_007338_2640 Disclaimer: The single-image derived 3D DEMs are mainly intended for visualization purposes. Although they are quite exact at reproducing relative heights at small scales, they are less accurate with respect to absolute heights at large scales. |
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Feb 23 2010, 08:07 PM
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#2
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 Senior Member Group: Moderator Posts: 2606 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Awesome!!!
-------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Feb 23 2010, 08:28 PM
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 The Poet Dude Group: Moderator Posts: 5546 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
That is just... well I can't use the word I want to use, so I'll just go with "nuts"...!!!!
Seriously, fantastic work. I get the very real feeling that you've opened the door on a whole new way of looking at, and visiting, Mars with these images of yours. -------------------- |
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Feb 24 2010, 02:09 AM
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#4
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 Senior Member Group: Moderator Posts: 6482 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Although it is well known that I studiously abstain from profanity of any sort, your images did cause me to utter a few choice expletives, Nirgal. Marvelous!!!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Feb 24 2010, 09:21 AM
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 Senior Member Group: Admin Posts: 2423 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
Wait
 Where did my jaw go?! Oh, there it is ..... ON THE FLOOR!!!!!!  Incredible work Nirgal. On Mars, On Mars, On Mars! |
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Feb 24 2010, 11:14 AM
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 IMG to PNG GOD Group: Moderator Posts: 1325 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
This is awesome. Are you taking into account the fact that apparantly there are large albedo variations in the source image? The terrain at left in the source image looks brighter than the terrain in other parts of the image.
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Feb 24 2010, 04:48 PM
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 Special Cookie Group: Members Posts: 2149 Joined: 6-April 05 From: Sintra | Portugal Member No.: 228 |
Man...just want to punch you!
-------------------- "Ride, boldly ride," The shade replied, "If you seek for Eldorado!"
Edgar Alan Poe |
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Feb 24 2010, 09:56 PM
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 Member Group: Members Posts: 618 Joined: 13-February 10 From: Vancouver, British Columbia Member No.: 5221 |
Incredible... like we're soaring right by it!
Makes me wonder if the avalanche made a detectable noise if anyone had been close enough to hear it when it happened. -------------------- To a body of infinite size there can be ascribed neither centre nor boundary... Thus the Earth no more than any other world is at the centre. -Giordano Bruno, 1584.
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Feb 24 2010, 10:13 PM
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#9
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Member Group: Members Posts: 707 Joined: 30-March 05 Member No.: 223 |
QUOTE (Bjorn Jonsson @ Feb 24 2010, 12:14 PM)  This is awesome. Are you taking into account the fact that apparantly there are large albedo variations in the source image? Very good question, Björn: I for myself was quite surprised on how well the large albedo differences got handled by the reconstruction algorithm that in theory should have more trouble with stark albedo variations. I did notice remarkable "albedo-robustness" before, in particular when I tried reconstructions of sand dune surfaces that contain large dust devil streak patterns whose extreme albedo differences should in theory disturb the reconstruction process, which, fortunately does not seem to be always the case and the streaked dunes DEMs got reproduced quite well:
I suspect that it is the various adaptive regularization terms I put into the optimization process that alleviate the albedo problem to some extend. Of course the perfect solution would be some sort of true albedo-correction based on stereo or altimeter-based DEMs but then again such data is not available for many regions ... |
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Feb 25 2010, 06:00 AM
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Junior Member Group: Members Posts: 29 Joined: 21-November 06 From: JPL Member No.: 1381 |
Wow! Speechless. So beautiful!
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Feb 25 2010, 04:20 PM
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 Newbie Group: Members Posts: 4 Joined: 21-December 07 From: Thessaloniki, Greece Member No.: 3987 |
awesome and quite unique!!!
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Feb 25 2010, 07:11 PM
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 Interplanetary Dumpster Diver Group: Moderator Posts: 4046 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Wow, exceptional! I love having the opportunity to see something like this from the ground that I would never actually want to see from the ground (because landslides hurt).
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Mar 2 2010, 08:59 PM
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#13
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Senior Member Group: Moderator Posts: 4168 Joined: 19-April 05 From: .br at .es Member No.: 253 |
> with this HiRISE data I was able to do some full detail 3D renderings posted at the other thread where it is more on topic
That's correct. Moving posts...done! |
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May 26 2010, 04:02 AM
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 Senior Member Group: Members Posts: 2164 Joined: 1-December 04 From: Marble Falls, Texas, USA Member No.: 116 |
As is often the case, I am a little late getting to this party. I am at a loss for words, but "Holy Moses!" comes to mind.
-------------------- ...Tom (thinks he should use more emoticons)
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Jun 26 2010, 09:54 AM
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#15
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Newbie Group: Members Posts: 16 Joined: 15-February 05 From: France Member No.: 169 |
Just wanted to point out that congratulations are in order for Nirgal who's the subject of the first article of next month french astronomy magazine "Ciel et Espace", following a little article published a couple months ago in which this very forum was also referenced.
http://www.cieletespace.fr/image-du-jour/4...martienne-en-3d |
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