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Radar And Mariner 10, Best possible mapping, pre-Messenger
antipode
post Dec 7 2006, 01:52 AM
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Outstanding new Arecibo radar images of equatorial and mid latitudes discussed here:

http://www.sciencedirect.com/science?_ob=M...=/sdarticle.pdf

P
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Phil Stooke
post Dec 7 2006, 02:57 AM
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Yes, that is an excellent article.

Phil


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... because the Solar System ain't gonna map itself.
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dvandorn
post Dec 7 2006, 04:49 AM
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Too bad it would cost me $30USD to take a look at it... sad.gif

-the other Doug


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tedstryk
post Dec 8 2006, 01:55 PM
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http://www.naic.edu/~radarusr/Mercury.pdf

You can access it free here.


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angel1801
post Dec 8 2006, 03:56 PM
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I always wanted some good full disk coverage of Mercury. And I thank the person who put up the link to article for a free view!


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I call heaven and earth to witness against you this day, that I have set before thee life and death, the blessing and the curse; therefore choose life, that thou mayest live, thou and thy seed.

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tedstryk
post Dec 8 2006, 05:17 PM
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That would be the first author, John Harmon.


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Phil Stooke
post Dec 9 2006, 05:58 PM
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This map is a composite of the USGS shaded relief and various radar images. The poles are reprojected from published images of the polar ice patches. The equatorial parts of the side not seen by Mariner 10 are from the new Icarus paper, but here these images have been specially processed to reduce the effects of the strong north-south ambiguity in all these images. That was not done in the new paper. Areas not covered may still be reprocessed in this way, but I'm not sure how well they can be done.

Phil

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... because the Solar System ain't gonna map itself.
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t_oner
post Dec 9 2006, 06:37 PM
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While reading this thread I realized I made the cylindrical map at http://www.lpl.arizona.edu/~rhill/alpo/mer...f/messenger.pdf, so here is my version of Phil's map.
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dvandorn
post Dec 9 2006, 08:10 PM
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Mucho, mucho gracias for the maps, Phil and Tayfun. To borrow a phrase... fascinating!

-the other Doug


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Phil Stooke
post Apr 8 2007, 06:18 PM
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I have updated my composite map of Mercury, adding a few extra bits from remaining radar images from the paper cited earlier. Wherever possible I have merged at least two overlapping images with different radar equators to reduce the north-south ambiguity. This is probably as good as it's going to get before Messenger arrives, unless new radar images suddenly appear.

Phil

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This is the northern hemisphere:

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Phil


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Phil Stooke
post Apr 8 2007, 06:19 PM
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... and the southern hemisphere:

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Phil


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volcanopele
post Apr 8 2007, 07:34 PM
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Using the above map, I ran through the first MESSENGER flyby in Celestia:

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ugordan
post Apr 8 2007, 07:48 PM
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Nice view VP. One thing I always wondered about visualization programs like Celestia is what kind of map projections they assume as textures. I always thought cylindric texture maps were required, but the vertical spacing of latitude lines in your view seems to be shrinking at the poles. Is this normal or is it suggesting a spherical projection maybe?

EDIT: On second thought, latitude lines shrinking is logical when properly mapped. I'd also expect cylindrical maps to behave the same so my non-extitent expertise in maps leads me to believe Phil's map is not cylindric, correct?


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Phil Stooke
post Apr 8 2007, 08:30 PM
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That is really cool, VP, thanks.

ugordan, I think you're just seeing the foreshortening one would expect near the limbs, north and south. My map was simple cylindrical, equal spacing of meridians and parallels. THere are other clindrical projections - Mercator, where spacing increases towards the poles to preserve conformality (shape), and perspective cylindrical where they get close towards the poles to preserve area.

Every planetary scientist should take a course in map projections!

Phil


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ugordan
post Apr 8 2007, 08:39 PM
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I see, Phil. I was under the impression that in 3D graphics, by "cylindrical" that which you describe as perspective cylindrical is implied, whereas in "spherical" map your simple cylindrical map was assumed.

I never could figure out the terminology. Then again, I don't call myself a planetary scientist so you'll have to forgive me. wink.gif


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