Interesting Maps
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,303 Mod ✭✭✭✭
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Technically that map is using five ;) A sphere can also be done with four colours.
"in a map with four regions, each touching the other three, one of them is completely enclosed by the others" - https://nrich.maths.org/6291
Very simple concept. Took 124 years to get from that to proof that only four colours were needed.
Turned out it wasn't very interesting as it needed a computer to go through an atlas of every possible combination of simplified maps.
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Thanks I learned something new today - I hadn't realised that many of the different languages of China are in fact languages of the Han Chinese.
This shows the map of the different languages in use in China and for example Cantonese is a Han Chinese language.
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,303 Mod ✭✭✭✭ Join Date:Posts: 89542
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Great maps posted up today, guys! Learned some new things. 👍👍
Here’s a beautiful historic 1832 map of the old London borough of St. Marylebone showing Regents Park and Camden Town which was still just about physically separate from London’s existing built up area.
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Map of Irish ancestry of USA population by county, 2012
Geographical distribution is pretty much as one would expect. The proportion of Americans with Irish ancestry has been in decline for a number of decades now.
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John Ogilby (1600-1676) was the Scottish cartographer who createed Britannia, the first British road atlas. According to Wikipedia:
In 1674 Ogilby had been appointed "His Majesty's Cosmographer and Geographic Printer" to King Charles II and in 1675 issued his Britannia atlas of 1675 which included such details as the configurations of hills and the relative size of towns. One hundred strip road maps are shown, accompanied by a double-sided page of text giving additional advice for the map's use, notes on the towns shown and the alternative pronunciations of their name. Another innovation was Ogilby's scale of one inch to the mile (1:63360). These are marked and numbered on each map, the miles further being divided into furlongs.[6] At that period some of the minor roads used the local mile rather than the standard mile of 1760 standard yards which Ogilby adopted in his atlas, setting the standard for road maps in future.[7] In his 2008 television series Terry Jones suggested that one of the map's purposes might have been to facilitate a Catholic takeover of the kingdom, a hypothesis supported by historian Alan Ereira.
The Continuation of the Road from LONDON to Holyhead Comencing at the City of CHESTER (1675)...
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,303 Mod ✭✭✭✭ Join Date:Posts: 89542
This reminded me of
XKCD on If you were to drain the oceans
At 200 meters, the map is starting to look weird. New islands are appearing. The Netherlands now control much of Europe.
The Netherlands expand north.
The Netherlands cross the new land bridge into North America.
This is what the map looks like when the drain finally empties.
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 91,303 Mod ✭✭✭✭ Join Date:Posts: 89542
All explained on the link If you were to drain the oceans .. "a circular portal 10 meters in radius leading into space was created at the bottom of Challenger Deep,"
I want to get one thing out of the way first:
According to my rough calculations, if an aircraft carrier sank and got stuck against the drain, the pressure would easily be enough to fold it up[1] and suck it through. Cooool.
Just how far away is this portal? If we put it near the Earth, the ocean would just fall back down into the atmosphere. As it fell, it would heat up and turn to steam, which would condense and fall right back into the ocean as rain. The energy input into the atmosphere alone would also wreak all kinds of havoc with our climate, to say nothing of the huge clouds of high-altitude steam.
So let's put the ocean-dumping portal far away—say, on Mars. (In fact, I vote we put it directly above the Curiosity rover; that way, it will finally have incontrovertible evidence of liquid water on Mars's surface.)
What happens to the Earth?
Not much. It would actually take hundreds of thousands of years for the ocean to drain.
The water pools in the North Polar Basin:
Gradually, it will fill the basin:
Frankly, I think this map is kind of boring; there's not a lot going on. It's just a big empty swath of land with some ocean at the top.
At this point, the water fills in the Valles Marineris, creating some unusual coastlines. The map is less boring, but the terrain around the great canyons makes for some odd shapes.
The water now reaches and swallows up Spirit and Opportunity. Eventually, it breaks into the Hellas Impact Crater, the basin containing the lowest point on Mars.
In my opinion, the rest of the map is starting to look pretty good.
As the water spreads across the surface in earnest, the map splits into several large islands (and innumerable smaller ones).
The water quickly finishes covering most of the high plateaus, leaving only a few islands left.
Let's take a closer look at the main islands:
Olympus Mons, and a few other volcanoes, remain above water. Surprisingly, they aren't even close to being covered. Olympus Mons still rises well over 10 kilometers above the new sea level. Mars has some huge mountains.
Those crazy islands are the result of water filling in 'Noctis Labyrinthus' ('the Labyrinth of the Night'), a bizarre set of canyons whose origin is still a mystery.
The oceans on Mars wouldn't last. There might be some transient greenhouse warming, but in the end, Mars is just too cold. Eventually, the oceans will freeze over, become covered with dust, and gradually migrate to the permafrost at the poles.[4]
However, it would take a long time, and until it did, Mars would be a much more interesting place.
When you consider that there's a ready-made portal system to allow transit between the two planets, the consequences are inevitable:
However, it would take a long time, and until it did, Mars would be a much more interesting place.
When you consider that there's a ready-made portal system to allow transit between the two planets, the consequences are inevitable:
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