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Old 27th May 2019, 06:27 AM   #1
GlennB
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Fun with the Mercator projection

I'm sure we all know that it exaggerates size more and more towards the poles, but the extent of it is nicely shown in this animation. I bumped into it by accidentally learning that Great Britain is the world's 8th largest island, which surprised me


The animation
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Old 27th May 2019, 07:16 AM   #2
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Cool.
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Old 27th May 2019, 07:34 AM   #3
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Nice, while I'm familiar with the Mercator projection I guess I never realized how enlarged Russia, Siberia and Greenland were in such projections, until now. Thanks.
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Old 27th May 2019, 08:16 AM   #4
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Originally Posted by GlennB View Post
I'm sure we all know that it exaggerates size more and more towards the poles, but the extent of it is nicely shown in this animation. I bumped into it by accidentally learning that Great Britain is the world's 8th largest island, which surprised me


The animation
Yes, that's quite excellent!

I also just learned the bolded bit last night, while reading a Bill Bryson book.
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Old 27th May 2019, 08:35 AM   #5
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Very nice! Is there a problem with the countries below the equator?
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Old 27th May 2019, 08:58 AM   #6
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Originally Posted by Humots View Post
Very nice! Is there a problem with the countries below the equator?
Never hit a country below the equator.
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Old 27th May 2019, 08:58 AM   #7
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Originally Posted by Humots View Post
Very nice! Is there a problem with the countries below the equator?
Anti-Mercatorist propaganda!

https://geoawesomeness.com/best-map-projection/

It seems the British school system prefers the Galls-Peters projection!

And The National Geographic Society prefers the Winkel-Tripel.*


*sounds like an ice-skating move.
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Old 27th May 2019, 09:12 AM   #8
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Originally Posted by Humots View Post
Very nice! Is there a problem with the countries below the equator?
Why? Watch Australia or Argentina, you'll see them grow and shrink. The thing is, there's a lot more land mass north of the equator, especially far north, so it's more obvious. Even most of Africa is north of the equator.

And even shrunk to its proper scale, Russia is enormous.
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Old 27th May 2019, 09:16 AM   #9
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It's nice to see those pompous braggarts the Canadians get their comeuppance!
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Old 27th May 2019, 09:37 AM   #10
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I like how the article describes the animation as "brilliant". Like he discovered the tradeoffs of the the Mercator projection, and morphing animations.
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Old 27th May 2019, 11:26 AM   #11
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Originally Posted by Elagabalus View Post
It's nice to see those pompous braggarts the Canadians get their comeuppance!
We're still bigger than you, you bastage!

Largest North American Countries: (by land area)

Canada: 9,984,670 sq km.
United States: 9,826,630 sq km.
Mexico: 1,923,040 sq km.
Nicaragua: 120,254 sq km.
Honduras: 112,090 sq km.
Cuba: 110,860 sq km.
Guatemala: 108,890 sq km.
Panama: 78,200 sq km.




https://www.worldatlas.com/webimage/...s/nalandst.htm

PS Assuming you're one of our Southern Neighbours, if not I apologize!

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Old 27th May 2019, 12:15 PM   #12
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There are basically three types of projections (with several variations):

- Angle-true (like Mercator).
- Distance-true (like many land-maps).
- Area-true.

Charts (for maritime and air navigation) are always angle-true, because you need to be able to plot a compass course.

Land maps are often distance-true because that is what matters there (since you follow roads, angles are secondary).

Area-true are useful exactly to understand geographical proportions.

Hans
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Old 27th May 2019, 01:01 PM   #13
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Originally Posted by Trebuchet View Post
Yes, that's quite excellent!

I also just learned the bolded bit last night, while reading a Bill Bryson book.
"Notes from a small [hee hee] island" ? Loved that book. Actually I loved most of his stuff.
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Old 27th May 2019, 01:05 PM   #14
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Originally Posted by Elagabalus View Post
Anti-Mercatorist propaganda!

https://geoawesomeness.com/best-map-projection/

It seems the British school system prefers the Galls-Peters projection!

And The National Geographic Society prefers the Winkel-Tripel.*


*sounds like an ice-skating move.
I prefer Dymaxion
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Old 27th May 2019, 01:14 PM   #15
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Originally Posted by 3point14 View Post
I prefer Dymaxion
Just looked. Bleuurghh.
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Old 27th May 2019, 02:50 PM   #16
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Anybody else read Bowditch? I found the logic and math elegant.

Volume II has a small ephemeris to go along with my plastic sextant.

IIRC, the local high noon gives longitude form Greenwich. (accurate clock needed) The degrees above the horizon at noon gives a circle for latitude. Where the longitude and the circle cross gives you two options of your position.

Goodness, I just checked eBay, real USN brass sextants are down to $40. I might have to buy a couple, ya know, marine prepper? And a couple ephemeri , $10 each, one for noon and one for midnight.

Talk about a wealth of outdated knowledge...
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Old 27th May 2019, 03:21 PM   #17
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I had no idea Canada was just a whisker larger than the US. From that animation, it looks smaller than the continental US, to say nothing of Alaska.
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Old 27th May 2019, 03:45 PM   #18
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Originally Posted by Beerina View Post
I had no idea Canada was just a whisker larger than the US. From that animation, it looks smaller than the continental US, to say nothing of Alaska.
Size of the US, population of California.
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Old 27th May 2019, 04:02 PM   #19
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and the biome of Siberia

https://en.wikipedia.org/wiki/Taiga
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Old 27th May 2019, 05:29 PM   #20
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Originally Posted by GlennB View Post
"Notes from a small [hee hee] island" ? Loved that book. Actually I loved most of his stuff.
Actually from the sequel, 20 years on, The Road to Little Dribbling. It's not as enjoyable so far. He actually seems proud of having given a minimum-wage McDonalds minion a bad time for an extended period for asking "Do you want fries with that" as required by the management.
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Old 3rd June 2019, 05:22 AM   #21
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There is, of course, an XKCD cartoon just for this thread.

Dave
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Old 3rd June 2019, 08:07 AM   #22
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Originally Posted by Dave Rogers View Post
There is, of course, an XKCD cartoon just for this thread.

Dave
Excellent!
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Old 3rd June 2019, 08:08 AM   #23
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Originally Posted by Trebuchet View Post
Actually from the sequel, 20 years on, The Road to Little Dribbling. It's not as enjoyable so far. He actually seems proud of having given a minimum-wage McDonalds minion a bad time for an extended period for asking "Do you want fries with that" as required by the management.
I enjoyed it, although he does seem to be somewhat grumpy in this book. I guess we all get more grumpy with age...
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Old 3rd June 2019, 08:09 AM   #24
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Originally Posted by theprestige View Post
Size of the US, population of California.
With virtually none of them in the big area in the middle...
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Old 3rd June 2019, 08:47 AM   #25
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Originally Posted by Giordano View Post
I enjoyed it, although he does seem to be somewhat grumpy in this book. I guess we all get more grumpy with age...
Doc Martin's Revenge!!!
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Old 3rd June 2019, 04:02 PM   #26
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"Yeah, but you can't do that."
"Why not?"
"Because it's freaking me out!"

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Old 3rd June 2019, 06:05 PM   #27
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Originally Posted by Dave Rogers View Post
There is, of course, an XKCD cartoon just for this thread.

Dave
"A globe: You are very clever."

Originally Posted by wollery View Post
"Yeah, but you can't do that."
"Why not?"
"Because it's freaking me out!"

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That's great!
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Old 3rd June 2019, 06:54 PM   #28
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Originally Posted by wollery View Post
"Yeah, but you can't do that."
"Why not?"
"Because it's freaking me out!"

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I almost asked for someone to dig up that clip a few days ago, but even thumb typing this on my tiny phone is a bear.
So... thank you.
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Old 4th June 2019, 11:03 PM   #29
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Originally Posted by Skeptic Ginger View Post
"A globe: You are very clever."

...

This is why I still keep the National Geographic globe my parents gave us when our kids were little. While it is woefully out of date as far as political borders, the land masses pretty much stay the same.



It lives next to my argument laptop (this one ). But both have been moved since their home is having its floor redone. Though the globe looks fetching with a jaunty straw hat in its temporary location.
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Old 4th June 2019, 11:58 PM   #30
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There is only one area accurate 2D world map:

http://www.authagraph.com/projects/d...%8B01/?lang=en






The idea of how to create it was first described by by Japanese architect Hajime Narukawa in 1999. The map is made by equally dividing a spherical surface into 96 triangles, transferring it to a tetrahedron while maintaining area proportions, and unfolding it onto a rectangle.


https://en.wikipedia.org/wiki/AuthaGraph_projection
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Old 5th June 2019, 12:04 AM   #31
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It can also be mapped to a triangle or parallelogram, not just rectangles. (On their homepage (first link) make note of the blue triangle version on Tab 4.)

In other words, cutting countries into different sides of the map can give other benefits, not least of which being able to choose any location as the map center.

Quote:
From this map-tiling, a new world map with triangular, rectangular or a parallelogram's outline can be framed with various regions at its center. This tessellation allows for depicting temporal themes, such as a satellite's long-term movement around the earth in a continuous line.
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Old 5th June 2019, 12:04 AM   #32
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I once had a nice globe with a bulb in the middle to illuminate it. I replaced the bulb with the wrong type and melted a large part of Canada and Alaska
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Old 5th June 2019, 12:41 AM   #33
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Originally Posted by GlennB View Post
I once had a nice globe with a bulb in the middle to illuminate it. I replaced the bulb with the wrong type and melted a large part of Canada and Alaska
With the northern latitudes heating the most under global warming, what did you expect?
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Old 5th June 2019, 09:23 AM   #34
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Originally Posted by This is The End View Post
There is only one area accurate 2D world map:

http://www.authagraph.com/projects/d...%8B01/?lang=en


http://www.internationalskeptics.com...ictureid=12159



The idea of how to create it was first described by by Japanese architect Hajime Narukawa in 1999. The map is made by equally dividing a spherical surface into 96 triangles, transferring it to a tetrahedron while maintaining area proportions, and unfolding it onto a rectangle.


https://en.wikipedia.org/wiki/AuthaGraph_projection
The western part of Australia looks really distorted.
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Old 5th June 2019, 09:49 AM   #35
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Originally Posted by This is The End View Post
There is only one area accurate 2D world map:




The idea of how to create it was first described by by Japanese architect Hajime Narukawa in 1999. The map is made by equally dividing a spherical surface into 96 triangles, transferring it to a tetrahedron while maintaining area proportions, and unfolding it onto a rectangle.


https://en.wikipedia.org/wiki/AuthaGraph_projection
I don't want your Authagraph!

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Old 5th June 2019, 09:55 AM   #36
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Originally Posted by Chris Haynes View Post
This is why I still keep the National Geographic globe my parents gave us when our kids were little. While it is woefully out of date as far as political borders, the land masses pretty much stay the same.



It lives next to my argument laptop (this one ). But both have been moved since their home is having its floor redone. Though the globe looks fetching with a jaunty straw hat in its temporary location.
Me too! Another hand-me-down globe fan*. Once you go global you'll never go back. 2D Maps are so like watching the movie version of your favorite book. Get real or go home.



*aren't we clever!
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