Dawn data in the PDS |
Dawn data in the PDS |
Nov 16 2012, 05:01 AM
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#31
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Here's a page I built to browse the Vesta approach data. It's a heavy download; I should probably split it into smaller pages but for now it's easier to keep in one big page. I figured some of you might find this useful.
https://planetary.s3.amazonaws.com/data/daw...n_approach.html -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Nov 16 2012, 06:55 AM
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#32
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Too tired to do anything very insightful with the data, but here's an animation of a limb survey toward the end of the Survey Orbit phase.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Nov 16 2012, 03:12 PM
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#33
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Oh for a little bit of panning about...sometimes I hate reaction wheels
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Nov 16 2012, 05:16 PM
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#34
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I have not yet seen a *single* color global mosaic. As far as I know, the only way to get a higher-resolution color global view than the 100-ish-pixel ones from way early in the approach phase is to do it the hard way: build a shape model, create global color and albedo maps, reproject things back out to a simulated view. It's making me absolutely crazy.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Nov 16 2012, 06:13 PM
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#35
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
.... i love you image with exaggerated colors. Thanks! I have not yet seen a *single* color global mosaic. As far as I know, the only way to get a higher-resolution color global view than the 100-ish-pixel ones from way early in the approach phase is to do it the hard way: build a shape model, create global color and albedo maps, reproject things back out to a simulated view. It's making me absolutely crazy. It's not the only way, nevertheless it's difficult. BTW, thanks for that huge gallery, it's very useful. Another glimpse from my planned blog entry - southern mountain in red-infrared view: -------------------- |
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Nov 16 2012, 06:32 PM
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#36
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I would be very grateful if you could do that one in approximate true color. I want to update my "all asteroids visited by spacecraft" poster and do it in color this time. Fortunately I won't be hampered by there being no color global photos of Vesta because Vesta is so big that if I tried to put the whole thing on it, you wouldn't see most of the others. So I'm only planning to have it peek over the edge.
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Nov 16 2012, 06:57 PM
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#37
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
I haven't that one in "true" colors, but I have this one (which is similar) in filters 7, 2, 8 (centered at 653, 555 and 438 nm).
Based on spectra, Vesta is red object, so this is probably close enough to true colors. -------------------- |
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Nov 16 2012, 08:38 PM
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#38
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Thank you! And here is another index page, to the Survey phase data. And I have now split the Approach and Survey pages into sub-pages to avoid bringing Firefox to its knees.
https://planetary.s3.amazonaws.com/data/daw...awn_survey.html -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Nov 17 2012, 12:22 AM
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#39
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I have not yet seen a *single* color global mosaic. As far as I know, the only way to get a higher-resolution color global view than the 100-ish-pixel ones from way early in the approach phase is to do it the hard way: build a shape model, create global color and albedo maps, reproject things back out to a simulated view. It's making me absolutely crazy. Yes, that's the way to go I think. And that's exactly what I'll probably do unless a shape model gets released within a not too long time (not likely to happen I think). |
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Nov 17 2012, 07:27 AM
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#40
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Member Group: Members Posts: 447 Joined: 1-July 05 From: New York City Member No.: 424 |
I have not yet seen a *single* color global mosaic. As far as I know, the only way to get a higher-resolution color global view than the 100-ish-pixel ones from way early in the approach phase is to do it the hard way: build a shape model, create global color and albedo maps, reproject things back out to a simulated view. It's making me absolutely crazy. Your blog post today discussing this problem mentions that the Vesta imaging team is working on a detailed 3d model “of this lumpy bumpy world” that is not likely to be released publicly soon. It’s also my understanding from past posts that Vesta's topography is being mapped for the possibly separate purpose of “mapping,” not just the surface, but the density and distribution of Vesta’s entire mass, and combining this information with delicate Radio and Doppler effect measurements, all with the goal of “obtaining a subterranean” 3D map of the dwarf planet’s interior and also an accurate 3D map of the gravity environment around the planet, for navigation and other purposes. Is this a unitary 3D mapping project? Or is their little overlap between the work needed to create a 3D model needed for the visual "planetary taxidermy" described in your current post, and the work needed for subterranean visualization and the mapping of the gravity field. |
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Nov 17 2012, 11:54 AM
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#41
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
And now I suddenly remember that already more than a year ago (!) Tayfun Öner was creating preliminary but remarkably good 3D/shape models of Vesta:
http://www.unmannedspaceflight.com/index.p...st&p=176794 http://www.unmannedspaceflight.com/index.p...st&p=177432 |
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Nov 17 2012, 04:38 PM
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#42
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
You might want to take a look at this regarding shape files..
http://naif.jpl.nasa.gov/pub/naif/DAWN/kernels/dsk/ |
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Nov 17 2012, 05:11 PM
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#43
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Junior Member Group: Members Posts: 22 Joined: 23-August 11 From: France Member No.: 6134 |
This shape is from Dr Robert Gaskell produced after the survey orbit.
As i remember, this shape use the old system coordinate before the first change (Claudia as prime meridian) by Dawn Team. I made (year ago) a conversion for cmod file (I choose cmod because i think it is very easy 3d file structures to read) here: http://patzawa.perso.sfr.fr/Download/Astro...que/Mesh/Vesta/ But even with shape i have a problem to build small mosaic Vesta rotates very fast and condition of illumination change as well. |
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Nov 17 2012, 07:40 PM
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#44
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Junior Member Group: Members Posts: 22 Joined: 23-August 11 From: France Member No.: 6134 |
My quick attempt of projection to the shape model.
View of Rheasilvia with FC21A0003510_11207035045F1F and FC21A0003511_11207035630F1F: http://www.youtube.com/watch?v=59CyNAuSD8c |
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Nov 18 2012, 07:45 PM
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#45
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Junior Member Group: Members Posts: 52 Joined: 16-November 06 Member No.: 1364 |
I haven't that one in "true" colors, but I have this one (which is similar) in filters 7, 2, 8 (centered at 653, 555 and 438 nm). Based on spectra, Vesta is red object, so this is probably close enough to true colors. I think you're quite close. Here's what I get for the "true" colors of Steins, Lutetia, and Vesta. |
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