Noise shape (DM parameter)

The 'noise shape' slider in the design map parameters wizard determines whether the random noise applied to the heightfield will be smooth like rolling hills, rough like jagged rocks, or a mix of the two.

This is demonstrated below, where where I've made terrain with noise shapes from 0% (rolling) up to 100% (fractal):

Noise shape	Heightfield	3D render
0% (left, rolling)
25%
50% (centre, default)
75%
100% (right, jagged)