III. EXPERIMENTS
Three different tests are performed; first on a reference
track to calibrate the system, second on various real surfaces
consisting of soil and sugar beets for variance calculation,
and third for evaluating the dynamic performance.
The first reference track is flat and the other consists of
linear slopes and some blocks according to Fig. 6. The height
to the reference level is measured to z = 453 mm, and the
height of the camera is 96 mm which gives a clearance of
357mm from the ground to the lens.