Raiseland has some advanced procedural parameters that are a little more difficult to understand. However, they can produce very interesting features. There are two "advanced" functions: the PDF and the noise multiplier.
The Probability Density Function (PDF) controls terrain uniformity. Press the PDF button to open a new menu. You will see many bars, each bar represents the probability of a point to be in that height level. The sum of all bars must be 100%, if this condition is not satisfied when you press accept, Raiseland will divide each bar by the total to satisfy the condition.
Unlike most controls, PDF is only applied after pressing Accept or Apply. However, you can activate an auto apply funciton by switching on Auto Apply.
The noise multiplier function allows to multiply a target noise by an origin noise. The origin noise must be set before the target noise.
The origin noise is selected by the Noise ID selector. If None is selected, the noise multiplier function is disabled, and all multiplier parameters are ignored.
Some parameters control this multiplication:
Different multiplier target values.
Different multiplier widths.
Different multiplier alpha values: 0.0, 0.5, 1.0.
Different multiplier blendings: low, medium high.