Philae landing on the nucleus of Comet 67P C-G |
Philae landing on the nucleus of Comet 67P C-G |
Jan 8 2015, 11:12 PM
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#1201
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
This time I can eventually see the overlapping of the lower parts of the picture, but there's still something wrong as the intersection of visual rays on same object ... Unless you correct the images for lens distortion the matches will be all over the place. Looking at the ESA releases you can see the correction: http://d1jqu7g1y74ds1.cloudfront.net/wp-co...st-panorama.jpg -------------------- _______________________
www.astrosurf.com/nunes |
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Jan 9 2015, 08:05 AM
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#1202
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
All those images are from first sequence. I think that the second sequence turned out to be in darkness and the rotation was done much latter. No, these are the first 6 images: http://sci.esa.int/rosetta/54945-first-com...anoramic-image/ You're missing this one: It will be interesting trying to figure out if the new image partially matches with one of the first images. Anyway your "brightned" images are very interesting; did also ESA release such "enhanced" versions? QUOTE About the useful FOV, I stand by my interpretation. As you like, but circles over your images mean that you are assuming that CMOS FOV is lower than 30°, but we know just two possible FOV values: 35° (external circle) and 30° (internal). |
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Jan 9 2015, 08:40 AM
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#1203
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
Unless you correct the images for lens distortion the matches will be all over the place[...] I think these images are distorted to be looked at from above. In my model I'm looking at them from cameras points of views, so I must use raw undistorted images. I don't know if looking at my model with undistorted images from above results in "actual" aerial view of the area. |
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Jan 9 2015, 09:26 AM
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#1204
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Junior Member Group: Members Posts: 81 Joined: 10-August 12 From: Kingston, Ontario, Canada Member No.: 6534 |
Barrel distortion will be there at any viewing perspective. The coefficients are actually given in the document scalbers linked to previously, "Determination of the Geometric Distortion of the CIVA-P QM Cameras", (see the tables in section 3.1). A decent explanation of the distortion can be found in the OpenCV documentation here.
Edit: Just noticed that same document also gives a good explanation starting on page 13. |
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Jan 9 2015, 11:14 AM
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#1205
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
No, these are the first 6 images: .... You're missing this one: Exactly the same I posted, only processed differently. There are different sources for the same images with different stretches. My versions are just a stack of all the releases. The image you say I'm missing it's the first image on the sequence I posted. All this has been discussed earlier on the thread. The image sources are there. -------------------- _______________________
www.astrosurf.com/nunes |
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Jan 9 2015, 11:21 AM
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#1206
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
I think these images are distorted to be looked at from above. In my model I'm looking at them from cameras points of views, so I must use raw undistorted images. Yes, they are arranged in a circular fashion to give an more or less vertical view. A kind of polar projection. Even if you have the full uncropped raws, you'd need to correct them for projection » see Orthographic projection. -------------------- _______________________
www.astrosurf.com/nunes |
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Jan 9 2015, 01:23 PM
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#1207
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
Exactly the same I posted, only processed differently. Sorry, I didn't get these are exactly same image! I tried brightening the dark one, but nothing emerged from black background. (I found official CNES releases of enhanced CIVA images) http://www.cnes.fr/web/CNES-fr/11557-gp-de...ama-de-civa.php Amyway I noticed just now that all these images are reduced versions of the original 1024x1024 images... |
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Jan 9 2015, 02:31 PM
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#1208
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
Yes, reduced and very likely cropped.
That dark image has an alternate brightened release, where the landing leg is cut of. It's on your link. You can't get any more that out of the release images since those are converted to 8bits. The original data has a higher dynamic. If we had it, we could try to do an HDR version. But since we have the different releases, we can stack them (as I did) and recover part of the original information. Here I've recovered some details on the rock face highlights: It's uncertain if the release images are the full frames or not. I think they are not, with the areas with no information around the edges cropped. But it's just my opinion, I don' have any more data then you -------------------- _______________________
www.astrosurf.com/nunes |
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Jan 9 2015, 05:51 PM
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#1209
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
I missed this official release of enhanced images two weeks ago!
http://aliveuniverseimages.com/speciale-mi...osetta-e-philae |
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Jan 9 2015, 06:40 PM
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#1210
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Senior Member Group: Members Posts: 4246 Joined: 17-January 05 Member No.: 152 |
I don't think there was an official release of the rolis post-landing images (ie on the various official Rosetta image sites). But the images were made public at the conference.
It's probably better to source images closer to the horse's mouth, either the conference site or the first link in this forum. We had lot's of discussion of those images following that post (including anaglyphs...). |
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Jan 9 2015, 07:02 PM
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#1211
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Junior Member Group: Members Posts: 22 Joined: 20-November 14 Member No.: 7344 |
The ROLIS surface images - lit by Blue, Red, Green, and Infra-Red - stereo images and an inset to demonstrate albedo were presented by Stefano Mottola at AGU14, between 9m05s, 10m30.
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Jan 10 2015, 03:02 PM
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#1212
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Member Group: Members Posts: 107 Joined: 1-August 14 Member No.: 7227 |
QUOTE Philae Comet Lander Failed in Sample-Drilling Attempt, Might Try Again http://www.space.com/28183-philae-comet-la...mple-fails.html |
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Jan 10 2015, 08:17 PM
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#1213
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Junior Member Group: Members Posts: 22 Joined: 15-November 14 Member No.: 7320 |
Program of a local German TV Station about the search: Was macht eigentlich die Sonde "Philae"? 'What's the probe "Philae" doing?'
Due to some laws in Germany it might be only available online for one week and I hope it's available in general outside of Germany. Lots of general TV blabla about the mission, but it also features Holger Sierks and two (as they say) unpublished pictures. He says, that they still haven't found it because of the high contrast region where Philae came down. Fred Goesmann (COSAC PI) is also interviewed, placed right in the middle of the lab, where he supposedly analyses the data: "I have to be careful not to interpret something into the data that I want to see, but is not really there, like staring on a Rorschach Test. Is it a butterfly you see or only an ink mark?" Moreover a deadline for publication of the results at end of January is mentioned. If that's true, this should also apply for the other instruments on Philae. But given the time a review process takes, we should have to wait a little longer for the first publications. |
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Jan 10 2015, 08:54 PM
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#1214
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
a deadline for publication of the results at end of January is mentioned. If that's true, this should also apply for the other instruments on Philae. But given the time a review process takes, we should have to wait a little longer for the first publications. Although the official deadline for submitting abstracts to the LPSC has passed, the programme and abstracts are not due to be posted online until 29th Jan. If that's the date they're referring to then the delay in releasing the latest information may not be very long. |
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Jan 11 2015, 07:34 PM
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#1215
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Junior Member Group: Members Posts: 93 Joined: 21-January 13 Member No.: 6845 |
Holger Sierks and two (as they say) unpublished pictures. The images have not been shown anywhere yet. But even if you have them in your hands there is no obvious lander visible. If you count the 3 pixel dots you have several dozen landers. Fred Goesmann (COSAC PI) is also interviewed, placed right in the middle of the lab, where he supposedly analyses the data. Moreover a deadline for publication of the results at end of January is mentioned. If that's true, this should also apply for the other instruments on Philae. But given the time a review process takes, we should have to wait a little longer for the first publications. The "lab" is the room where the ground reference model is in a vacuum chamber. The room is used to make measurements, but nobody sits there to do analysis of data, the pumps of COSIMA and COSAC are not that pleasant to listen to. For the paper I hope the review process will be fast. |
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