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foldable map of Itokawa, a cook's tour of the sausage factory
chuckclark
post Jan 23 2010, 03:39 AM
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Not that I mean to compare Itokawa to a sausage, just to show you behind the scenes of making the map, along with the map itself, here, rather than continue to clog up the Hayabusa Return to Earth thread.
Here is the map itself, so far along as the pasting in of the mosaic has gone.
And here is are two shots of the folded up map, compared with the computer-made model. Note the arrow to one of the "ears." The first try of the map failed to capture the ear, so I replotted the boundary, as seen in the Tracing image.
All photos credit: Sara Adkins Studio
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Phil Stooke
post Jan 24 2010, 09:47 PM
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Very interesting, Chuck, and there is a good reason for this. The cylindrical projection map assumes there is a unique location on the surface for any latitude-longitude coordinate pair. But at the location you are having trouble with, this breaks down for Itokawa - the surface is so irregular that a radius from the center of mass cuts the surface more than once. It's a well known cartographic problem for mapping irregular shapes, and it occurs on other bodies too. Your method independently discovers it. In this area of my map the image is messed up, but in a future version it could be fudged a bit better.

Phil


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... because the Solar System ain't gonna map itself.
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- chuckclark   foldable map of Itokawa   Jan 23 2010, 03:39 AM
- - chuckclark   Okay, ran out of file space on that post. Here ar...   Jan 23 2010, 03:42 AM
- - chuckclark   And here is a shot of the work lab where this all ...   Jan 23 2010, 03:45 AM
- - Phil Stooke   Now that's what I call a workshop, Chuck! ...   Jan 23 2010, 03:54 AM
|- - chuckclark   Phil, I'll have to expand the mosaic. Just of...   Jan 24 2010, 07:39 PM
- - chuckclark   Well, so much for one more day. The mosaic has a ...   Jan 24 2010, 07:56 PM
- - Phil Stooke   Very interesting, Chuck, and there is a good reaso...   Jan 24 2010, 09:47 PM
|- - chuckclark   QUOTE (Phil Stooke @ Jan 24 2010, 04:47 P...   Jan 24 2010, 11:59 PM
- - stevesliva   Just wait until we find that Mobius-shaped asteroi...   Jan 24 2010, 11:54 PM
- - Phil Stooke   I'll see what I can find tomorrow. "Just...   Jan 25 2010, 12:21 AM
|- - chuckclark   "No - just a cylindrical projection with a tw...   Jan 25 2010, 01:15 AM
- - Phil Stooke   This is primarily for Chuck, but I'll post it ...   Jan 25 2010, 02:13 PM
- - chuckclark   "I'll see what I can find tomorrow....   Jan 25 2010, 02:25 PM
- - chuckclark   Okay. that wasn't so difficult. I took this i...   Jan 25 2010, 08:11 PM
- - chuckclark   Here are the tabs I'm gonna try this time -- I...   Feb 1 2010, 07:30 PM
- - chuckclark   Phil, Can you remake the hi-contrast Itokawa cylin...   Feb 8 2010, 05:18 PM
- - Phil Stooke   Hi Chuck - I just emailed it to you. Phil   Feb 8 2010, 05:46 PM
- - chuckclark   Okay. Three-fourths of the way put together. Her...   Feb 11 2010, 02:28 AM
- - nprev   I am always amazed & deeply impressed by peopl...   Feb 11 2010, 07:15 AM
|- - chuckclark   QUOTE (nprev @ Feb 11 2010, 02:15 AM) I a...   Feb 11 2010, 03:49 PM
- - chuckclark   Here's the group photo. On the plastic model,...   Feb 11 2010, 06:12 PM
- - chuckclark   Here's the last taping and folding sequence. ...   Feb 16 2010, 02:07 PM
- - chuckclark   And to wrap up the tour -- everybody say cheese --...   Feb 16 2010, 02:09 PM
- - chuckclark   And here's a beta version of conference handou...   Feb 21 2010, 06:54 PM
- - chuckclark   So, on to the valley-bound map. This map organize...   Feb 22 2010, 03:30 PM
- - chuckclark   And this is how the Valley "A" map looks...   Feb 24 2010, 08:51 PM
- - Phil Stooke   Nic, Chuck! See you in Houston. Phil   Feb 24 2010, 11:59 PM
|- - chuckclark   Oh, forgot to say, I didn't try to unscramble ...   Feb 25 2010, 03:18 AM
- - chuckclark   Well, several misalignments in the graticles at th...   Feb 25 2010, 11:07 PM
- - chuckclark   Here's the ridge-bound constant-scale natural ...   Mar 14 2010, 10:26 PM
- - chuckclark   Here's a more interrupted valley-bound map, th...   Oct 16 2010, 04:45 PM


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