Planetocopia Map Thread

Discussion in 'Alternate History Maps and Graphics' started by Lowtuff, Sep 29, 2015.

  1. Tsochar Well-Known Member

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    When given the choice between math and "eyeballing it," I go with math because it's more reliable.

    111 kilometers is the approximate distance of 1 degree of latitude on Earth's surface. It varies very little, between 110.6 km at the equator and 111.7 km at the poles. Lines of latitude are perfect circles on a sphere, with the center being on the poles.

    Still assuming you live in Manila. If your north pole is at 12.6N, 8W (Bamako, Mali), then the distance between those points would be 13651 km, which divides to 123° almost exactly. 90°-123°=-33°, or 33S. So yes, you'd be 33 degrees from the equator.

    You can do a check of the formula by looking at antipodal points.

    Taipei, Taiwan, and Asunción, Paraguay, are very close to each other's antipodes, meaning they are nearly exactly on the opposite side of the world from each other. Let's say we want Taipei to be the north pole, 90°N. This means that its antipode, Asunción, should be very close to the south pole, which is 90°S. We put it into the map, which tells us the distance is 19947 kilometers (default is miles; remember to select kilometers!). 19947/111=179.7. 90-179.7=-89.3, which is close to -90. The formula checks out.
     
  2. aja675 Well-Known Member

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    As for North America, I think the population is still gonna be less sparse than Australia because there would be lots of lakes and mountains to break up the outback.
     
    Last edited: Feb 20, 2018
  3. aja675 Well-Known Member

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    BTW, you wound up at 26.054054054 degrees south.
     
  4. aja675 Well-Known Member

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    OK, so here's an updated version from the same person who made the modified map: [​IMG]
     
  5. aja675 Well-Known Member

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    And I wound up at 33rd degrees north, roughly near/around Southern California.
     
  6. Petros >Peter Fergus< Well-Known Member

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    Regarding the most complete equatorial current idea - I think XKCD's Cassini could be the closest. It does have Antarctica in the way, but unlike the other versions, the current can flow around, and possibly through, Antarctica. After that it only has to wind it's way around Africa, and then thread it's way through the Bering Strait.

    Again, I don't have image software on this PC, so imagine the equator, it's on the international date line -

    [​IMG]

    If we're looking for maximum circumtropical currents, this isn't a bad place to start.
     
  7. Lowtuff 涼しい風

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    [​IMG]

    hi, if you want the longest possible uninterrupted stretch of water then kamchatka-pakistan is as far as you should be able to go
     
  8. Tsochar Well-Known Member

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    The longest unbroken line on ocean is not necessarily the equator with the most ocean, since that circumference also goes straight through a very mountainous patch of Central Asia and the Mongolian highlands.

    Every circumference on a sphere's surface corresponds to a pair of poles, which means every point on a hemisphere has a unique circumference. There might be a program that could tell you how much land/water is on a given equator, and then run it for a set of lat/long pairs in the northern hemisphere, and then you could find the equator with the highest ocean percentage. Maybe a GIS program could do that, but I don't know how to use those.
     
  9. Redcoat Wanted in 19 different Timelines Banned

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    [​IMG]

    Can someone make me a map with the equator following this line? It goes through Nantes, just outside of Zagreb, Bern and Varna, slices through Tasmania, reaches the tip of New Zealand, through the Panama/Costa Rica border, and just misses the Galapagos. Anyone up for it? My computer can't seem to download any of those mapping tools.

    The North Pole is at 43.1 N and 178.5 E

    Not even a basemap, I just want someone to generate the map.
     
    Last edited: Feb 28, 2018
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  10. Petros >Peter Fergus< Well-Known Member

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    Here is one basic projection tool, I think it will run on almost anything, this laptop is five years old.

    http://www.petermoor.nl/overig/worldmap/

    [​IMG]

    [​IMG]

    Does this look right?
     
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  11. Redcoat Wanted in 19 different Timelines Banned

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    It does! So many thanks to you.
     
  12. Redcoat Wanted in 19 different Timelines Banned

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    Doesn't work on Windows 10.
     
  13. Admiral A. Kolchak Supreme Leader

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    Here's one as close as I could make it. Robinson.

    [​IMG]
     
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  14. Redcoat Wanted in 19 different Timelines Banned

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    Can you get rid of the Lat.Lon lines pls? I need to be able to edit the map.
     
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  15. Petros >Peter Fergus< Well-Known Member

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    D'oh! It's pretty old and it hasn't been updated in a while.

    Some other posters have access to 'GProjector', but it didn't run on my last PC.
     
  16. Redcoat Wanted in 19 different Timelines Banned

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    My PC seems to reject every program download I've done except Paint.net
     
  17. Admiral A. Kolchak Supreme Leader

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    The generator doesn't allow me to do that. If you really want me to I can remove them manually, although it will take forever.
     
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  18. Admiral A. Kolchak Supreme Leader

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    I went with the "literally holding a ruler up to my screen approach".
     
  19. frustrated progressive Insert Witticism Here Monthly Donor

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  20. Mt.82-9 New Member

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    Sep 16, 2018
    Everestia.png

    Interesting thread... someone on the worldbuilding Reddit posted this a while back with the same idea you had.
    https://www.reddit.com/r/worldbuild...stia_my_take_on_what_the_world_would_be_like/

    Its a pretty basic map, not very detailed but a good starter for anyone else interested (for instance he did not account for sea level fall or the existence of Hudson Bay being questionable).