3D shape, cartography, and geoid of Comet 67P C-G |
3D shape, cartography, and geoid of Comet 67P C-G |
Aug 6 2014, 02:11 PM
Post
#1
|
|
Solar System Cartographer Group: Members Posts: 10176 Joined: 5-April 05 From: Canada Member No.: 227 |
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 Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
|
|
Aug 15 2014, 06:18 PM
Post
#2
|
|||
Solar System Cartographer Group: Members Posts: 10176 Joined: 5-April 05 From: Canada Member No.: 227 |
Ok... I have been taking some time out from what I should really be doing - finishing a book (Emily will understand this) - to play around with some ideas about what a map of 'the nucleus that dare not speak its name' should look like.
Let me preface this by saying - this is a horrible map, very distorted and inaccurate, and the Rosetta team will do much better soon and completely discredit me. This is only intended to illustrate roughly what a proper map might look like. It's cylindrical, so the projection is very distorted to begin with. We had a video of a shape with a lat-long grid, so that forms the basis of my coordinate system. I took images from orientations which roughly matched frames from the video and overlaid them. Two sources of error immediately - the shape was based on low res images and will not fit high res images very well to begin with, and the overlay is only approximate due to different view directions, so it's hard to match positions properly. Then I copied areas grid cell by grid cell and pasted them and distorted them to fit the grid. Lots of problems and bad fits especially in the neck area, obviously. The grid is spaced at 15 degrees like the shape model video grid. Longitude 180 is in the middle. A separate version is annotated to show where the main features are. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
||
|
|||
Lo-Fi Version | Time is now: 2nd June 2024 - 03:15 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |