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foldable map of Ida
chuckclark
post Oct 27 2008, 12:57 PM
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Here is a constant-scale natural boundary map of Ida that folds to a decent replica of the asteroid. Map edges are Ida's major ridges.[attachment=16299:Ida_MaxRidge_post.jpg]
[EDIT] Here it is again with the photomosaic properly credited; apologies to M. Nyrtsov for my oversight.
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Guest_jumpjack_*
post Nov 6 2008, 08:24 AM
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QUOTE (chuckclark @ Oct 27 2008, 02:57 PM) *
Here is a constant-scale natural boundary map of Ida that folds to a decent replica of the asteroid. Map edges are Ida's major ridges.[attachment=16299:Ida_MaxRidge_post.jpg]
[EDIT] Here it is again with the photomosaic properly credited; apologies to M. Nyrtsov for my oversight.

I can't believe it! blink.gif

Did anybody build it?!?

Does it exist a pic of it completed? blink.gif
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dilo
post Nov 6 2008, 03:07 PM
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I tried with the aid of my son but result was very bad... perhaps, I need to print it on a larger scale (it was A5 size approx).


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chuckclark
post Nov 6 2008, 05:31 PM
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I've put it together twice -- I'll post a digital pic as soon as I can find a pal with a digital camera -- and the first one went together easier than the other. So it seems that where you start, and which sides you leave the tabs on, makes a difference in the result.
The bigger size definitely helps. I printed it on 11 x 17 (ledger-size) paper.
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Phil Stooke
post Nov 6 2008, 06:14 PM
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Does my old friend Maxim Nyrtsov read this? Hi Maxim! See you next year!

Yes, Maxim visited me in Ontario in 2000, and helped a lot with the image reprojection work for the global mosaic Chuck has used here. He lives and works in Moscow.

Phil


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

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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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Guest_jumpjack_*
post Nov 7 2008, 07:26 AM
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It was difficult for me even to build a paper Earth globe, without something to glue the paper on... I can't imagine how I could build such an irregular shape..... huh.gif

But I guess a 3d model should exist somewhere, if a card model has been prepared: where could I find it? Maybe I could build a model by means of multiple overlapped "slices" of cardstock or wood... huh.gif
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t_oner
post Nov 7 2008, 11:41 AM
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I built the physical models that Chuck is using to create his maps, if anyone is interested I can cut the computer model in slices that you can print on paper to create your own models.
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djellison
post Nov 7 2008, 12:13 PM
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What format are those models available in?
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Guest_jumpjack_*
post Nov 7 2008, 12:52 PM
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QUOTE (Tayfun Öner @ Nov 7 2008, 01:41 PM) *
I built the physical models that Chuck is using to create his maps, if anyone is interested I can cut the computer model in slices that you can print on paper to create your own models.

It was just an idea, I don't know if it is actually feasible to glue the textured paper model over the "sliced carstock model".
Anyway it could be interesting to give it a try.

Are you going to manually "cut" the model in slices, or does it exist (already? huh.gif ) a program to do it?

BTW, I remember several years ago I used this "slice method" to build a model of Mount Etna, and the result was very very good even without textures, as the border lines stressed the shapes of hills and valleys.

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t_oner
post Nov 7 2008, 01:06 PM
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I can convert the models to most popular formats.

Cutting the computer models in slices is an automatic process. I think it would be feasible to build such a model, the most difficult part would be cutting the slices from cardstock. If you have access to a laser cutter you will only have to glue them, using guide holes that I can add.
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Guest_jumpjack_*
post Nov 7 2008, 01:20 PM
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QUOTE (Tayfun Öner @ Nov 7 2008, 03:06 PM) *
I can convert the models to most popular formats.

Cutting the computer models in slices is an automatic process. I think it would be feasible to build such a model, the most difficult part would be cutting the slices from cardstock. If you have access to a laser cutter you will only have to glue them, using guide holes that I can add.

Actually I didn't use cardstock for Etna model... but I don't know the english name! rolleyes.gif They were sheets of gum, used to cover floors ("linoleum"?), 1 or 2 mm thick. Quite easy to cut using scissors, as they don't rip like cardstock.
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chuckclark
post Nov 7 2008, 02:16 PM
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jumpjack:
Here is a link Phobos Arts and Crafts that gives tips and pics on assembling these paper models -- Note the link deals with Phobos not Ida, but the assembly tips ought to be transferable. Emily's article also includes (I'll have to confirm this) another link to a post I made here at USF with further tips and alternate method (clear tape) of holding it together -- Emily prefers glue.

Oh, Tayfun, now I see your post about the internal slice-packing -- What a superb idea! If you check out the latest posts (and maps) at the "Map of Eros" thread, you'll see my frustration at getting the Eros folded-up map to hold its shape in the Shoemaker region; an internal mass , even if was a fairly loose fit, would, I think, do the trick.

The problem will be to coordinate the size properly, so that the photomosaic paper will wrap the insides neatly. The "Tayfun slices" (aim for about 3/8 inch thick; keep it extremely coarse -- not many slices will be needed; as well as a bit undersized) will make on object of a certain scale, and if that matches the scale bar included on the csnb (constant-scale natural boundary) map, things ought to work. Or be close enough that a little fiddling will be all that's needed.

When I print the Ida and Eros maps on ledger paper, the assembled (folded-up) objects are about 5.5 inches in longest dimension. They aren't in front of me at the moment, but when I get back to my asteroid lab I'll put the micrometers on them and report.
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Guest_jumpjack_*
post Nov 10 2008, 08:12 AM
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QUOTE (chuckclark @ Nov 7 2008, 04:16 PM) *
jumpjack:
Here is a link Phobos Arts and Crafts

Well, the final result is not at all as I thought it was. I think I won't try it, unless Tayfun post his "sliced" models...
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chuckclark
post Nov 10 2008, 01:33 PM
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OK, I corralled a photographer, (S. Adkins) to take a pic of the folded map.

Here (on the left, courtesy of T. Oner)) is a digital image of Ida; and (on the right) the Adkins photo, taken from approximately the same point of view as the digital image.

On the other hand, I think jumpjack is best to wait and hope that Tayfun will make a slices-infill. Two reasons:

1) IN GENERAL: These are experimental maps; folding up to make a convenient, holdable model is a nice property, but the maps are far from perfect (the technology at the moment uses -- to make outlines and graticles -- the very latest of Renaissance graphical techniques, and Photoshop to add the photomosaics).

2) IN SPECIFICS: With the exception of a few crania I mapped a while back, Ida is the most complicated form yet attempted in constant-scale natural boundary mapping, certainly the most extravagantly shaped asteroid. Something (on the back side of this view!) is a little amiss -- to kinked or cramped -- around point "n.". It's easy for the geometry to slip a bit, and the edge get a little out of alignment or true constant-scale; this is probably the problem. Printers can also be a bit out of relative proportional accuracy.

So best to take this all with a grain of salt.

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t_oner
post Nov 10 2008, 03:13 PM
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Chuck the comparison photo is really impressive.

Due to Ida's irregular shape slices will not be contiguous and I suggest first we try it with Phobos. I will post the slices in DXF and CDR formats in a few days.
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