Adjustment Operator

Offsets and/or scales a height field along Y. Basically, a bit like the Brightness/Contrast functions in an image processing software.

Gain

This changes the gain of the terrain, effectively scaling the terrain's altitude values.

Offset

This will move the whole terrain up or down, without changing the scale of the values.

Relative Offset

By default, Offset works in world units. Enable this option to work in relatio to the terrains altitude range.

Tip: This operator seems boring at first. But in confunction with Fields, it's a very handy tool for local adjustments.