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There are several programs available that will generate a random map of an Earth-sized planet, complete with a choice of projections from sphere to 2-D representation.

Are there any available that will generate random maps for a setting like Larry Niven's Ringworld, that is habitable but effectively flat over distance scales large compared to the size of a normal planet?

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  • $\begingroup$ You can plug in to a regular generator a 2-d world and just on your own set the distances very far apart, can't you? $\endgroup$ – White Fang Mar 20 '16 at 16:15
  • $\begingroup$ @WhiteFang Sure, you could take a small scale map and call it large scale, but the result would be very coarse-grained; if you call the smallest islands huge continents, then there won't be any features on your world smaller than huge continents. $\endgroup$ – rwallace Mar 20 '16 at 16:42
  • $\begingroup$ Most map generators are fractal-based, so you'll get the same result building a high resolution map over a relatively small area that you would building a huge map. $\endgroup$ – ckersch Mar 20 '16 at 16:54
  • $\begingroup$ @ckersch I haven't found one that has arbitrary fractal scaling, don't suppose you could point me to one? $\endgroup$ – rwallace Mar 20 '16 at 17:08
  • $\begingroup$ Isn't there a canonical question for this somewhere? If the question is specifically for support of the non-standard planet, then general answers that don't take that into consideration would be wrong. $\endgroup$ – JDługosz Mar 21 '16 at 6:41
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Only some examples from /r/worldbuilding. Not the most popular or useful ones, but you can make use of them.

  • Voronoi-based planet generator made in Unity. If I recall correctly, you can edit the final result. Might be a bit oversized for you, but this is the best stuff I've ever seen in the topic.

    enter image description here

  • This stuff called WorldBox, generates islands for you. Importing out is possibly only by image editing, as I judge it, but I'm sure you'd do that either way. If you miss to find a download link, here it is.

    enter image description here

  • An unnamed HTML5-based map generator - obvious browser support + png export feature. A bit slow, recommended only on PC.

    enter image description here

  • The game Rimworld. Several games generate amazing 2D maps in-game, I'd recommend looking for some options.

    enter image description here

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