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I'm trying to generate a very specific map: one with an arctic ocean, a volcano, and preferably a taiga (or other frozen, wood-filled land).

I've managed to generate a couple of coastal volcanoes so far, (including one with a sub-ocean magma pipe. that was a fun embark -- 5 minutes of "cave in has occurred" as water became obsidian and then fell to the bottom of the magma sea) but they're never close enough to the poles to be in an arctic ocean. (I have a strong desire to acquire War Walruses, you see, so I simply must have an arctic biome :P )

Is there any way I can decrease the temperature on an already generated world? How can I increase the number of Cold or Freezing squares on each map?

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So from what I gather is that you want to create a specific map or decrease the temperature on an already created map. I don't know the latter but I can help with the former:

  1. Open up DF
  2. On the main screen select Design New World With Parameters
  3. Select one of the presets and press the e key
  4. Scroll down till you see the following (should be the second page):

alt text

  1. Change the Maximum Temperature and Minimum Volcanism values
    • good values for Temperature are ~45
    • good values for Volcanism are >50
  2. Finally, to ensure a good Taiga you'll want to play with the Rainfall parameter.
  • Unfortunately, this hasn't worked in my experience (as I've tried what you suggested several times before you suggested it). What I wound up with was a world where there is a sharp border of Cold/Freezing squares, (as opposed to the gradual gradiant a "more normal" world gen would probide) but not actually a greater percentage of cold squares. – Raven Dreamer Aug 31 '10 at 15:34
  • @Raven if you're running into sharp boarders you need to change the X and Y-Variance. The Variance dictates the range between squares in the X and Y directions. A lower Variance should create a more gradual gradiant – tzenes Aug 31 '10 at 15:53

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