Set the percentage of the area that will be occupied by water.
Set the maximum height of the terrain.
Set the number of iterations the softness filter will operate; the more times the less rough the terrain.
Selecting the perlin tab will choose the perlin generation mode.
Set the starting feature size of the noise function.
Set how quickly the noise will diminish from each starting feature. Higher values result in more rugged terrain; lower values result in smoother rounder terrain.
Selecting the Midpoint Tab will choose the midpoint displacement generation mode.
Higher values result in rougher features; lower values result in rounder features.
Smoothen the terrain.
Generate a terrain map based on the supplied values.