Filling degree gauge, agricultural vehicle with the gauge, and method of measuring and displaying residual filling potential of target area

A filling degree gauge for measuring and displaying a residual filling potential of a target area being filled through a target with goods by a goods carrier of an agricultural vehicle, the filling degree gauge comprising:

• a 3D imaging device for observing at least a part of the target area including at least a part of the target;
• a data control system arranged for receiving images of the observed part of the target area from the 3D imaging device;
• and
• a visual display unit;
• wherein said data control system operates to provide on the visual display unit a first visual display indicating a residual filling potential by indicating a current one of at least three different levels of the residual filling potential.