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
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Solar System Cartographer Group: Members Posts: 10192 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) |
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Aug 23 2014, 02:37 PM
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#2
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Solar System Cartographer Group: Members Posts: 10192 Joined: 5-April 05 From: Canada Member No.: 227 |
Hi Malmer - cartographers have already discussed these issues, so nobody is limiting anything to cylindrical maps. But the standard cylindrical maps are useful in many cases despite bad distortions because they are easily imported into common visualization software.
As an example, a toroidal world - like a comet nucleus with a vent burned right through it - could be mapped onto a plane using two dimensions, the azimuth around the ring itself and the azimuth around the cross-section (if you see what I mean) - two perpendicular azimuth dimensions mapped into a rectangle. It could also be mapped in azimuthal projections as the top and bottom faces, each one a circle with a hole in the middle. A Pretzel world - multiple piercings, a sort of hipster comet - could be done in more complex variations of the same ideas. Even cylindrical mapping can be done differently - especially as a transverse cylindrical projection where, for instance, an extremely elongated object like Eros can be surrounded by a cylinder whose long axis coincides with the object's long axis (instead of the rotation axis). Only the outer ends don't get mapped well like that, and they are done on small separate maps, as we often do polar maps in addition to a cylindrical Mercator projection. Separate maps of different areas are fine - we do it all the time on Earth after all - but they don't solve the issue of making one global map. 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) |
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