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Dawn data in the PDS
elakdawalla
post Nov 16 2012, 05:01 AM
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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


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elakdawalla
post Nov 16 2012, 06:55 AM
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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.


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tedstryk
post Nov 16 2012, 03:12 PM
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Oh for a little bit of panning about...sometimes I hate reaction wheels rolleyes.gif


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elakdawalla
post Nov 16 2012, 05:16 PM
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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.


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machi
post Nov 16 2012, 06:13 PM
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QUOTE (Sarunia @ Nov 15 2012, 01:49 PM) *
.... i love you image with exaggerated colors.

Thanks!

QUOTE (elakdawalla @ Nov 16 2012, 06:16 PM) *
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:
Attached thumbnail(s)
Attached Image
 


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elakdawalla
post Nov 16 2012, 06:32 PM
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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.


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machi
post Nov 16 2012, 06:57 PM
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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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elakdawalla
post Nov 16 2012, 08:38 PM
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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


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Bjorn Jonsson
post Nov 17 2012, 12:22 AM
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QUOTE (elakdawalla @ Nov 16 2012, 05:16 PM) *
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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Tom Tamlyn
post Nov 17 2012, 07:27 AM
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QUOTE (elakdawalla @ Nov 16 2012, 12:16 PM) *
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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Bjorn Jonsson
post Nov 17 2012, 11:54 AM
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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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djellison
post Nov 17 2012, 04:38 PM
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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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Sarunia
post Nov 17 2012, 05:11 PM
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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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Sarunia
post Nov 17 2012, 07:40 PM
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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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Stefan
post Nov 18 2012, 07:45 PM
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QUOTE (machi @ Nov 16 2012, 07:57 PM) *
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.

Attached Image
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