How turn off islands on mapgen 7?

[amadin]

How turn off islands on mapgen 7? I want generate a single continent with lakes and rives

[paramat]

Use custom noiseparams (as explained in minetest.conf) to raise average terrain level so that seas become smaller lakes.
Add these to .conf but increase the first number:

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mgv7_np_terrain_base = 4, 70, (600, 600, 600), 82341, 5, 0.6, 2.0
mgv7_np_terrain_alt = 4, 25, (600, 600, 600), 5934, 5, 0.6, 2.0

The first number is the average terrain level for the 2 terrain types, increase them by the same amount, perhaps start by increasing by 16 then tune to taste.
Then increase mountain height:

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mgv7_np_mount_height = 256, 112, (1000, 1000, 1000), 72449, 3, 0.6, 2.0

Increase the first number by the chosen amount.

[amadin]

Thanks, does there are full manual about others parameters of mapgen 7?

[paramat]

Not yet, but lua_api.txt has some explanation of noise parameters, although it's rather technical.

[amadin]

After raise average terrain level (on the advice of paramat) decreased number of lakes. Does there a way to increase number of lakes after raise average terrain level on a smooth landscape?

[paramat]

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mgv7_np_terrain_base = 4, 70, (600, 600, 600), 82341, 5, 0.6, 2.0
mgv7_np_terrain_alt = 4, 25, (600, 600, 600), 5934, 5, 0.6, 2.0

You can split the lakes up into a larger number of smaller lakes by increasing octaves from 5 to 6 and/or increasing persistence from 0.6 to 0.7. However this will make the smooth landscape less smooth.