In this example two data sources are combined with a multiply operator to produce a rocky island. The multi fractal source makes the rocks. How rocky the hills are depends on the octave parameter of the noise generator. In this case octaves are set to approximately 3.5. This parameter is independent from location. This leads to a uniform roughness all over the island. The radial gradient is only responsible for lowering the terrain at the borders.

The orange connections are modelling the data flow from the sources to the sink.