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#1
frax

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Hi,
I am preparing a map over migration routes to/from the Arctic - primarily birds and cetaceans. And I would love to get some advice on how to properly present those corridors/routes.

Let's focus on the birds, for now. Other maps usually present these as wide shaded areas, they overlap as well, without arrows. In my map I wanted to simplify things a little, and to not be so exact. It gets messy too with the overlapping corridors, which I wanted to avoid. Since the focus of the work is Arctic (and migration to/from) I chose the Fuller/Dymaxion projection, which presents the whole World interrupted, but the Arctic is in the middle. I also wanted to not make the Arctic too small, so I thought I would cut off parts of the Southern hemisphere.

Here is where I am at right now:
Posted Image

Which is quite ok - but I have some symbolization problems...
  • How do I show that the arrows toward South America and Australia continue outside the map boundary (there are birds that migrate all the way to Antarctica)
  • How do I present it so that it doesn't look like the arrows are from a) to B) - it is a corridor/flyway with some birds stopping on the way.

Hugo Ahlenius
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#2
frax

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I can just add that the main thing we want to present is how the Arctic is connected to the World (and vice versa) - but it has to be reasonably accurate!
Hugo Ahlenius
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#3
frax

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Some quick experimentation with alternatives, I think the one with faded lines/corridors might actually work...

This is using a quick/dirty art brush that I set up (is there an easier way to make those kinds of dashed endpoints?). The dashes needs to be improved...
Posted Image

Using faded arrows/corridors using opacity mask:
Posted Image
Hugo Ahlenius
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#4
Pete

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Some quick experimentation with alternatives, I think the one with faded lines/corridors might actually work...

This is using a quick/dirty art brush that I set up (is there an easier way to make those kinds of dashed endpoints?). The dashes needs to be improved...


Using faded arrows/corridors using opacity mask:


Hi frax -

I like the corridors with the feathered ends the most of all of your representations. I don't know but maybe you could add a couple of extra little lines at the ends of the main route to give an impression of some sort of "dispersal" - like a three smaller streams flowing into a larger one.

Thing is ... I'm not completely in love with your projection :( ! If you map is dealing with movement of beasties it doesn't quite fit that the background has gaps - the birds could fly over them I suppose but the cetations would have to swim around :lol: !

When I was reading your description I thought you might go for something like this sort of thing.

It's just an idea but could you show the map as two hemispheres but add a border around each map to provide an overlap so it's easier to follow a line from one map to the other.

Attached File  Untitled_1.gif   51.6KB   48 downloads

It's a rubbish diagram but you get the idea!

#5
Crischan

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I have nothing against the projection, and nothing against the corridor symbols crossing the void - as long as i am not shown that there is a void. why not put just the landmasses on a unicolored background? if all you want to show is connectiviness, then that would work, i guess. people are smart enough to recognize the well-known landmasses and if you want to provide length of the corridors you would have to use annotation regardless.
as for the line ends - i like the feathered ends best, too. :)
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#6
frax

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Pete, I want to avoid showing the Southern Hemisphere. Another alternative is, of course, to use a globe centered on the Arctic - for map projection. The flyway corridor/paths are wide and not exact, so I am not so worried about them crossing the cores. I am not sure I'll skip the gore outlines/sea though, but I am not too worried about the presentation of the cetacean migration - I think it is pretty clear.

And the branching-ends - I think they work similarly to arrows, it still makes it looks like it is a migration from the endpoint-to-endpoint - a better presentation would be to have them branching all the way...

Using feathered lines also makes the map much less busy compared to the original map with the arrow heads, by the way!
Hugo Ahlenius
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#7
Pete

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I like Crischan's idea of just ditching the map outlines altogether and basing the landmasses on a solid background ... much better'n mine <_< ... :lol: !

I see what you mean about the arrowheads - you eye goes to the arrowheads and the actual route seems kind of secondary.

#8
David Medeiros

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I really like the lines with the gradient on the ends. I also like the transparency there so you can see the map detail beneath them. Instead of arrows or multiple converging lines, maybe try a slight widening of the line as it hits the gradient.

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#9
Jean-Louis

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I like Crischan's idea of just ditching the map outlines altogether and basing the landmasses on a solid background ... much better'n mine <_< ... :lol: !

I see what you mean about the arrowheads - you eye goes to the arrowheads and the actual route seems kind of secondary.


Here is a suggestion with a very rough concept based on what was said.

Hang projection accuracy. Exagerate your polar circle and lay the landmasses on either side on a solid background. You could squeeze Australia and S-america in there if it was a bit more horizontal.

Put some small secondary arrows that go off from the main routes.
Attached File  worldconnections2.jpg   40.49KB   58 downloads
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#10
frax

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Hang projection accuracy.


Now you have to go rinse your mouth for swearing like that - it is like saying that I should do a map without a scale bar, north arrow and legend!!! I feel dirty from just reading that. Ouch!
Hugo Ahlenius
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#11
Jean-Louis

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Hang projection accuracy.


Now you have to go rinse your mouth for swearing like that - it is like saying that I should do a map without a scale bar, north arrow and legend!!! I feel dirty from just reading that. Ouch!


Wait a minute. Let me defend this. You are simply making a flat world map projection centered on the North Pole in which the circumference is the South Pole and your North arrow points away from that circumference to the centre. It may be unusual but it's a perfectly legitimate projection and the orientation is very understandable because of the recognizability of continents. Unfolding the Globe like this is not any 'dirtier' than unfolding it as a World map projection.

The dirty effect may come from the quick distortion I did but I could visualize it as a circle with scale bar and legend and even a dotted inner circle for the equator.

I will humbly kneel in contrition at the atlar of the Cartographic gods if I offended anyone else.

Here's an example of another blasphemer
Attached File  m06937.jpeg   231.1KB   44 downloads
Jean-Louis Rheault
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#12
Pete

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Here's an example of another blasphemer
Attached File  m06937.jpeg   231.1KB   44 downloads


BURN THE WITCH!! :lol:

I like that one! Do it like that one frax! ... maybe without the cherubim though ... or putti, if you want to split hairs!

#13
Jean-Louis

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Here are a bunch of other foul-mouthed heretics.
Maybe we should storm the libraries and have a map burning
Attached File  polar.gif   125.08KB   30 downloadsAttached File  projection_derivation_polar_azimuthal_orthographic.gif   7.99KB   27 downloads
Attached File  azimuthalequinorthannotated.jpeg   22.21KB   28 downloadsAttached File  1492.discovery_CWA156.jpeg   115.93KB   58 downloadspeg]
Jean-Louis Rheault
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#14
frax

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J-L - sorry if I didn't make it clear, I couldn't decide if I should put in a smiley face or not, but I was joking! (when I called it heresy) In my work I always try to avoid north arrows, scale bars and I try to avoid using legends if I can.

I don't think it is a bad idea, but I won't do it for this map. If I would do it for some other category of publication I might do it, but not for this one.

The report I am on is under scientific review, and I want to keep it reasonably strict. If it was only birds it would be a different thing, but for marine migration it is important to get some idea on the proportions, sizes and locations of sea areas. I will tone done the gores and sea colors though.
(I ruin the strictness by having routes crossing the gores, but one can't have everything... !)

By the way - does anyone know what projection that last map that J-L posted is, the one with some kind of expeditions/exploration paths?
Hugo Ahlenius
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#15
Nick H

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By the way - does anyone know what projection that last map that J-L posted is, the one with some kind of expeditions/exploration paths?

I don't know, but in some ways it's similar to the Dudley equal-area projection (but missing Antarctica):

http://www.cartotalk...p...0&hl=dudley

Regards, N.
Caversham, Reading, England.




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