A method and apparatus for controlling positioning of an agricultural implement relative to the ground is disclosed. The method involves receiving first and second position signals representing respective first and second positions of the agricultural implement relative to the ground and providing input to a controller for controlling the positioning of the agricultural implement. The method involves receiving an intermediate position signal representing an intermediate position of the agricultural implement and being associated with an intermediate location between locations respective first and second positions. When the intermediate position signal represents a position that is closer to the ground than a threshold intermediate distance due to a ground inconsistency, the method involves modifying the first and second position signals based on the intermediate position signal to represent positions that are closer to the ground to cause the controller to lift the agricultural implement to clear the ground inconsistency.