|«——— Contour at height Ze 
] av 
Ie vector representing 
linear velocity 
t 
fracKinó pomnf with 
associated mass M 
(à) Initial location of fracking point on Contour 
Direction of steepest 
Slope of terrain 
Je Contour 
   
   
      
  
Magnitude of 
Terrain slope S 
YZ 
Horizontal 
reference 
Tracking point 
Plotted track 
(b) Trac KING pont off contour 
  
  
/ 8x 
Tracking Point 
€) Direction of acceleration a required +o rove The 
Tracking point as quickly as possible back to contour 
A 
Figure 3 : Rrtainin$ fe the Nullimó of Plotting Errors 
in Contour Mapping 
  
AX \ 
Tracking 
mont 
Enlarged view showing 
Plotfirig error AD