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Updated Titan Map
Juramike
post Jun 22 2007, 07:20 PM
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Apologies! I meant "That's a really good point, DOUG".

(With all this new information, the connection between the two hemispheres of Juramike's brain finally snapped. Juramike could never again place the name of an object with it's shape. For the rest of his natural life, Juramike referred to any bowl-like object as "crater" )


tongue.gif


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scalbers
post Jun 22 2007, 10:20 PM
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Hi again,

I've made a few more map updates and increased the size to 4K. This is also now posted on my regular web site at the following URL:

http://laps.fsl.noaa.gov/albers/sos/sos.html#TITAN

Interesting to see what looks like those long rivers flowing toward the seas of the north pole.


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alan
post Jun 23 2007, 05:05 AM
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QUOTE (David @ Jun 21 2007, 07:04 PM) *
Very nice!

But it gets me thinking again about the global distributions of different terrains and climates on Titan. The overall picture seems clear: Titan is a semi-desert moon, wet at the poles, very dry around the equator, with an equatorial belt of sand-seas in (it seems) lower terrain. Which raises the following questions for me:

1) Why is the equatorial belt so irregular in shape? Just chance variations in elevation?

2) What constrains the desert belt to north and south? Or to put it another way, what's going on in the temperate zone in terrains that would be deserts if they were equatorial?

Looking at the global view I see three different units: large areas of bright terrain, the dark 'sand seas' forming an incomplete belt around the crater, and below 30 degrees south a gray area.

The gray area appears to have been overlooked in these discussions. Anyone have an idea about why it is it different that the bright terrain with a similar latitude in the northern hemisphere?

Attached Image
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belleraphon1
post Jun 23 2007, 04:32 PM
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Beautiful work ....

Agree that Titan seems to be a desert world but we have to be careful not to carry that analogy too far.
Remember that Huygens detected a lot of methane coming out of the ice/hdrocarbon regolith (smurst?) after it impacted.

I am REALLY looking forward to better views of the southern pole. We need to understand how the the 7 year summer at the south pole has affected the methane cycle and the geochemistry and geophysics in that region as well.

More FUN coming up juramike!!!!!!!!

Craig
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Phil Stooke
post Jun 23 2007, 07:23 PM
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stevesliva said:

"That's nice!

Although a mercator projection centered at the equator distorts exactly what is interesting at Titan... "



I want to comment on this because I have encountered this elsewhere. The most fundamental cartographic product - and the hardest to make - is the initial global mosaic itself. Once you have it, it can be reprojected into any other form of map with appropriate software. I will post a polar view of Steve's new map later to demonstrate. Don't think of the simple cylindrical map as an end in itself, it's an image database which can be turned into any other map projection, or wrapped around a sphere, or animated... etc. And frankly the simple cylindrical is just about the easiest of those things to make the other products from.

I encountered this with my new Eros mosaic - why make an old-fashioned flat map? Why not project it onto a 3-D shape model and animate it? - but where do you think the mosaic to project onto the model comes from in the first place?

(oh, and yes, it's not Mercator! It's Simple Cylindrical, where a degree is represented by a specified number of pixels in both E-W or N-S directions. In Mercator the N-S spacing varies away from the equator.)

Phil


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ngunn
post Jun 23 2007, 08:44 PM
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I can't wait for that polar version. I've been hoping someone would provide a south polar map of Titan for ages. I even posted a request on CICLOPS. So far I've only seen it in small PDF format used as a base for the flyby groundtracks.
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Phil Stooke
post Jun 23 2007, 09:15 PM
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southern hemisphere:

Attached Image



Northern hemisphere:

Attached Image


Phil


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ngunn
post Jun 23 2007, 09:16 PM
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Hallelujah!
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David
post Jun 24 2007, 12:40 AM
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Beautiful, just beautiful. Now that we've seen the radar of the northern region, it's a little easier to interpret the dark markings at the south pole, although it now becomes a matter of wonder why the 'bean-shaped' lake is, not just a lake, but one with such smooth and nicely curved boundaries, unlike both the northern lakes and the other lakes in its vicinity.

I wonder if the "gray" areas in the temperate zones might be -- I'm not sure of a proper terminology that doesn't imply vegetation, but anyway -- swamp, or wetland -- shallow lacustrine regions that are intermittently (seasonally?) dry, or at any rate more like perpetually damp, methanelogged land, than like lakes, thus perhaps being an intermediate term between the polar lakes and the equatorial deserts, which (as suggested above) might be concealing a fair bit of subterranean moisture as well.
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alan
post Jun 24 2007, 06:03 AM
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QUOTE (David @ Jun 23 2007, 07:40 PM) *
I wonder if the "gray" areas in the temperate zones might be -- I'm not sure of a proper terminology that doesn't imply vegetation, but anyway -- swamp, or wetland -- shallow lacustrine regions that are intermittently (seasonally?) dry, or at any rate more like perpetually damp, methanelogged land, than like lakes, thus perhaps being an intermediate term between the polar lakes and the equatorial deserts, which (as suggested above) might be concealing a fair bit of subterranean moisture as well.

Maybe they aren't perpetually damp. It could be a seasonal change.

I'll stick my neck out and make a wild prediction: after the equinox the gray area in the southern hemisphere will brighten and a new gray area will form in the northern hemisphere.

Remember, you heard it here first.
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Reckless
post Jun 24 2007, 10:12 AM
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This is my first post on a Titan thread.

The Bean shaped lake looks like it is sitting in a volcanic caldera.

I know it's only a 2d map on which deapth is very hard to infer, the area around the lake seems to be sloping away from it.

Roy ph34r.gif
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Ian R
post Jun 25 2007, 12:42 PM
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I'm not sure how useful this will be, but here's my attempt at combining the ISS and VIMS mosiacs of Titan:

Attached Image


The original ISS image (thanks Steve!):

Attached Image


The original VIMS from the JPL Photojournal (latitude and longitude lines removed):

Attached Image


Ian.


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ngunn
post Jun 25 2007, 12:49 PM
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QUOTE (David @ Jun 24 2007, 01:40 AM) *
it now becomes a matter of wonder why the 'bean-shaped' lake is, not just a lake, but one with such smooth and nicely curved boundaries, unlike both the northern lakes and the other lakes in its vicinity.


I think the bean-shaped Ontario Lacus does in fact resemble the individual lobate extremities of the large northern lake as seen by ISS, both in size and apparent roundness.
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Juramike
post Jun 25 2007, 02:41 PM
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Dear Steve, Alan, and Phil,

Wow! That's an awesome combination (of effort and images)!

Based on this combination of ISS and VIMS images, I speculatively identified additional "circular objects of interest" beyond those in this post.

Here are the newly tentatively identified "craterforms" drawn on the mosaic made by Steve (Circles drawn outside the tentative diameter of the craterform for clarity):

Attached Image


What is also really cool about the combo of ISS and VIMS data is the huge amount of dark blue ice sand in the outer dark halo of Minrva. This would help support that connection between the dark blue ice sand halo and Minrva.

Wow!

-Mike


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tty
post Jun 25 2007, 02:56 PM
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QUOTE (David @ Jun 24 2007, 02:40 AM) *
I wonder if the "gray" areas in the temperate zones might be -- I'm not sure of a proper terminology that doesn't imply vegetation, but anyway -- swamp, or wetland -- shallow lacustrine regions that are intermittently (seasonally?) dry, or at any rate more like perpetually damp, methanelogged land, than like lakes, thus perhaps being an intermediate term between the polar lakes and the equatorial deserts, which (as suggested above) might be concealing a fair bit of subterranean moisture as well.


The word you are looking for is "playa"


tty
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