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3D shape, cartography, and geoid of Comet 67P C-G
Phil Stooke
post Aug 6 2014, 02:11 PM
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Explorer 1 said:

"A 2D map of C-G seems like a tough order; the projection math alone..."


Don't worry! If you can put a grid on the surface (as we have seen already), you can warp that grid into any map projection you like. Mapping will be no huge problem - in fact I expect they have a rough one already (I've been playing with one myself).

Phil


--------------------
... because the Solar System ain't gonna map itself.

Also to be found posting similar content on https://mastodon.social/@PhilStooke
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JohnVV
post Sep 3 2014, 09:50 PM
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QUOTE
I'd be interested in grabbing whatever you guys come up with. Point cloud is OK. Then I can play with gravity modeling.

i just zipped up a the mash as of today
-- a low res 1.3 meg .obj file
the zip contains a map-grid uv mapped
https://googledrive.com/host/0B6ZYAd08tZL-V....09.03.2014.zip
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Posts in this topic
- Phil Stooke   3D shape, cartography, and geoid of Comet 67P C-G   Aug 6 2014, 02:11 PM
- - acastillo   It would appear that the neck is an "erosiona...   Aug 6 2014, 02:44 PM
|- - AndyG   QUOTE (acastillo @ Aug 6 2014, 03:44 PM) ...   Aug 6 2014, 03:47 PM
|- - TheAnt   QUOTE (acastillo @ Aug 6 2014, 04:44 PM) ...   Aug 6 2014, 04:46 PM
|- - mcgyver   QUOTE (acastillo @ Aug 6 2014, 03:44 PM) ...   Aug 8 2014, 07:47 PM
- - Phil Stooke   Not a pain, it just means the cartographers have l...   Aug 8 2014, 08:04 PM
- - Explorer1   Wouldn't the two lobes just gradually come bac...   Aug 8 2014, 08:06 PM
|- - Mercure   I believe the centrifugal forces at the rotational...   Aug 8 2014, 10:05 PM
- - Phil Stooke   I think you're right, the lobes would collapse...   Aug 8 2014, 10:00 PM
- - djellison   Rotation rate is 12.7 hours. The circumference dr...   Aug 8 2014, 10:17 PM
- - nprev   The key variable between these scenarios is mass, ...   Aug 8 2014, 10:20 PM
- - ngunn   Every irregular object eroded from the outside mus...   Aug 8 2014, 10:22 PM
- - nprev   Could acquire more angular momentum from impacts o...   Aug 8 2014, 10:28 PM
- - djellison   If it were rotating fast enough to displace the tw...   Aug 8 2014, 10:37 PM
- - SteveM   I'm not convinced by the emerging consensus th...   Aug 8 2014, 10:42 PM
|- - djellison   QUOTE (SteveM @ Aug 8 2014, 03:42 PM) I...   Aug 8 2014, 11:10 PM
|- - Y Bar Ranch   QUOTE (SteveM @ Aug 8 2014, 05:42 PM) I...   Aug 11 2014, 02:16 PM
|- - djellison   QUOTE (Y Bar Ranch @ Aug 11 2014, 07:16 A...   Aug 11 2014, 02:47 PM
||- - Y Bar Ranch   QUOTE (djellison @ Aug 11 2014, 09:47 AM)...   Aug 11 2014, 04:02 PM
|- - ngunn   QUOTE (Y Bar Ranch @ Aug 11 2014, 03:16 P...   Aug 11 2014, 02:48 PM
- - Greenish   I had been curious about the gravity field so was ...   Aug 9 2014, 01:42 AM
- - machi   According to my calculations gravity/centripetal r...   Aug 9 2014, 01:53 AM
- - Adam Hurcewicz   OK, here is visualization from Celestia. I made mo...   Aug 10 2014, 05:16 PM
- - Gerald   For 67P/C-G, and similarly asymmetric bodies, I...   Aug 10 2014, 06:03 PM
|- - fredk   QUOTE (Gerald @ Aug 10 2014, 06:03 PM) Pr...   Aug 10 2014, 06:38 PM
- - Harder   thanks, Gerald, for your insights. I noticed you f...   Aug 10 2014, 06:36 PM
|- - Gerald   QUOTE (Harder @ Aug 10 2014, 08:38 PM) .....   Aug 10 2014, 07:11 PM
- - Phil Stooke   The up and down can be incorporated into topograph...   Aug 10 2014, 09:43 PM
- - JohnVV   the problem at this time is we do not have a mesh ...   Aug 10 2014, 11:38 PM
- - Gerald   If you take a binary of two spherical bodies, the ...   Aug 11 2014, 03:37 PM
|- - Y Bar Ranch   QUOTE (Gerald @ Aug 11 2014, 10:37 AM) If...   Aug 11 2014, 04:08 PM
|- - Gerald   QUOTE (Y Bar Ranch @ Aug 11 2014, 06:08 P...   Aug 11 2014, 04:36 PM
|- - ngunn   QUOTE (Y Bar Ranch @ Aug 11 2014, 05:08 P...   Aug 11 2014, 04:42 PM
|- - Y Bar Ranch   QUOTE (ngunn @ Aug 11 2014, 12:42 PM) I r...   Aug 11 2014, 04:50 PM
- - Phil Stooke   Ok... I have been taking some time out from what I...   Aug 15 2014, 06:18 PM
|- - MoreInput   Thanks for the map, Phil. What about the idea to ...   Aug 16 2014, 08:46 PM
- - Explorer1   Very impressive! The axis must be tilted quite...   Aug 15 2014, 07:13 PM
- - wildespace   I have seen members here mention generating synthe...   Aug 16 2014, 07:54 AM
- - ngunn   That same idea occurred to me: map them separately...   Aug 16 2014, 09:42 PM
- - JohnVV   this gif animation ( pre orbit data ) http://sci...   Aug 17 2014, 04:55 AM
|- - mcgyver   QUOTE (JohnVV @ Aug 17 2014, 04:55 AM) th...   Aug 22 2014, 02:13 PM
- - Phil Stooke   Re - mapping the lobes separately - it's an in...   Aug 17 2014, 05:33 AM
- - JohnVV   still working on this , just an early preview ...   Aug 20 2014, 10:26 PM
- - Phil Stooke   JohnVV wrote: I was able to extract a pointcloud ...   Aug 22 2014, 03:39 AM
- - JohnVV   phil there is a zip with a obj mesh in it here ht...   Aug 22 2014, 03:50 AM
- - Malmer   I'm playing around making a highresolution 3D ...   Aug 22 2014, 04:07 PM
|- - JohnVV   QUOTE (Malmer @ Aug 22 2014, 12:07 PM) I...   Aug 23 2014, 01:35 AM
||- - Malmer   QUOTE (JohnVV @ Aug 23 2014, 03:35 AM) ni...   Aug 23 2014, 06:42 AM
|- - mcgyver   QUOTE (Malmer @ Aug 22 2014, 04:07 PM) I...   Aug 23 2014, 10:06 PM
|- - Malmer   QUOTE (mcgyver @ Aug 24 2014, 12:06 AM) S...   Aug 23 2014, 10:42 PM
|- - Toma B   QUOTE (Malmer @ Aug 24 2014, 12:42 AM) I ...   Aug 24 2014, 10:07 AM
- - JohnVV   QUOTE Do you explain somewhere the method you used...   Aug 22 2014, 05:50 PM
- - Phil Stooke   Hi Malmer - cartographers have already discussed t...   Aug 23 2014, 02:37 PM
- - Malmer   For my own selfish purposes I will probably use so...   Aug 23 2014, 05:36 PM
- - machi   QUOTE (wildespace @ Aug 16 2014, 09:54 AM...   Aug 25 2014, 10:42 AM
|- - Gerald   QUOTE (machi @ Aug 25 2014, 12:42 PM) ......   Aug 25 2014, 12:08 PM
- - JohnVV   QUOTE t would be interesting to see a map of where...   Sep 2 2014, 11:41 PM
|- - Malmer   QUOTE (JohnVV @ Sep 3 2014, 01:41 AM) dow...   Sep 3 2014, 11:49 AM
- - charborob   What I would like to see is an image of the comet ...   Sep 3 2014, 12:42 AM
|- - SteveM   QUOTE (charborob @ Sep 2 2014, 07:42 PM) ...   Sep 3 2014, 01:20 AM
- - JohnVV   with "Down as the direction of the SouthPole ...   Sep 3 2014, 01:08 AM
- - JohnVV   QUOTE Is that your own shapemodel or is it somethi...   Sep 3 2014, 05:14 PM
|- - Malmer   QUOTE (JohnVV @ Sep 3 2014, 07:14 PM) no ...   Sep 3 2014, 08:54 PM
|- - Y Bar Ranch   I'd be interested in grabbing whatever you guy...   Sep 3 2014, 09:09 PM
|- - Malmer   Will post as soon as it is resonably correct.   Sep 3 2014, 09:48 PM
- - Phil Stooke   I am very impressed by this, John! Looking fo...   Sep 3 2014, 06:05 PM
- - JohnVV   QUOTE I'd be interested in grabbing whatever y...   Sep 3 2014, 09:50 PM
|- - Malmer   QUOTE (JohnVV @ Sep 3 2014, 11:50 PM) i j...   Sep 3 2014, 10:32 PM
|- - CAP-Team   QUOTE (JohnVV @ Sep 3 2014, 11:50 PM) i j...   Sep 4 2014, 06:50 PM
||- - mcgyver   QUOTE (CAP-Team @ Sep 4 2014, 06:50 ...   Sep 4 2014, 07:08 PM
||- - djellison   QUOTE (mcgyver @ Sep 4 2014, 12:08 PM) Wh...   Sep 4 2014, 09:09 PM
|- - Malmer   QUOTE (JohnVV @ Sep 3 2014, 11:50 PM) i j...   Sep 4 2014, 11:05 PM
- - JohnVV   3ds to cmod is rather easy now the plugin is for ...   Sep 4 2014, 08:11 PM
|- - Malmer   QUOTE (JohnVV @ Sep 4 2014, 10:11 PM) 3ds...   Sep 4 2014, 08:33 PM
- - Gerald   Some qualitative sensitivity analysis of trajector...   Sep 4 2014, 10:07 PM
- - fredk   Nice. So did you chose the rotation axis to be pe...   Sep 4 2014, 10:23 PM
- - Gerald   Yes.   Sep 4 2014, 10:30 PM
- - JohnVV   Blender is not a "cad/cam" set-up so th...   Sep 5 2014, 06:47 PM
|- - Malmer   QUOTE (JohnVV @ Sep 5 2014, 08:47 PM) Ble...   Sep 5 2014, 07:04 PM
- - JohnVV   well the landing site is near 190 long and just a ...   Sep 16 2014, 05:44 AM
- - JohnVV   with the few images and the video "Possible ...   Sep 24 2014, 12:43 AM
|- - Malmer   QUOTE (JohnVV @ Sep 24 2014, 02:43 AM) wi...   Sep 24 2014, 01:17 AM
- - JohnVV   from the image "Comet_on_16_August_c.jpg...   Sep 24 2014, 02:25 AM
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