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New map of Phobos
Phil Stooke
post Apr 16 2010, 11:45 PM
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MRO was used in the last section, but it only just creeps into the top left corner of this one. The right edge of this one is the anti-Mars longitude.

Phil


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pjam
post Apr 17 2010, 03:18 AM
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Great stuff, Phil!

Hmmm. Not sure about eroded crater chains. Some grooves appear to be long furrows with no pits at all; other grooves are decorated with overlapping crater-like pits. There are also linear associations of craterlike pits that could be interpreted as crater chains ...but to my eye the pits are too evenly spaced.
Maybe there is a real crater chain in there, but I'd side with interpreting these all as having some other common formation mechanism.
What process(es) would make these groove and linear pit features on Phobos?

-pjam


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Phil Stooke
post Apr 23 2010, 03:22 PM
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I've finished the eastern end of the global map now - here it is, reduced x4 and compressed. Eventually the full file will be available for anyone who wants it.

The west end is all that's left. That was the region least well mapped by Viking, so it looks really bad in the old map. It will be greatly improved by adding the HRSC coverage.

Phil

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CAP-Team
post Apr 23 2010, 07:04 PM
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This new map already looks great in Celestia!
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Phil Stooke
post Apr 23 2010, 07:31 PM
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Nice to know! But wait 'til you see the next bit.

Phil


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Phil Stooke
post Apr 26 2010, 09:24 PM
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First tile of the new section. I do each section in nine tiles because my software is limited in the number of control points I can define for one reprojection.

I really need new rubber-sheeting software if anyone has any tips. Must do thin plate splines, though. Polynomials are useless for this application.

Phil

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Phil Stooke
post Apr 27 2010, 06:03 PM
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Next tile added...

Phil

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chuckclark
post Apr 27 2010, 06:35 PM
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My, this'll teach me to run off to D.C. and miss all the action. Lovely improvements.
I'll just sit quietly until you finish, Phil. Then, please steer me to the full-res version and I'll pop it (warp it) onto one of the constant-scale natural boundary Phobos maps.
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Hungry4info
post Apr 27 2010, 09:23 PM
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Interesting cross-thatch pattern at the lower-left of the new tile. A result of grainy images from the spacecraft?


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Phil Stooke
post Apr 27 2010, 09:29 PM
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Yes, and it will probably be replaced with better images soon.

Phil


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Phil Stooke
post Apr 30 2010, 04:40 PM
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Several additions now. All that remains is a long narrow gap along the equator and down the side of Stickney crater.

Phil

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Phil Stooke
post May 7 2010, 03:44 PM
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And the new map is finished:

Attached Image


Actually, not quite finished, because I'm going to make a second version warped to fit the new global control network from DLR, based on MEX images. This one takes its control from the Cornell University shape model and mosaic by Damon Simonelli et al. (1993).

I'm off next week, but I'll do the new version when I get back. Both versions will be submitted to PDS along with several other maps including my Eros mosaic. The full Phobos mosaic is 14400 pixels long, 4 times this resolution.

Phil


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jasedm
post May 7 2010, 04:26 PM
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A truly impressive labour of love Phil.
The Stickney crater looks quite unremarkable when the data's presented like this - I well remember first seeing that iconic Viking picture of Phobos where the surface almost looked like Stickney plus a few grooves - the image was captured at a relatively high phase angle I suppose.
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Hungry4info
post May 8 2010, 01:29 AM
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That is nothing short of amazing. It looks great in Celestia too! smile.gif

I eagerly look forward to seeing the full resolution version.


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nprev
post May 8 2010, 02:01 AM
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Beautifully rendered, Phil!


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