Figure 3a: Scattered DEM 
    
       
   
   
    
Ne Dor 
| se a. CR 7 
NN vr 7 
| | 
  
  
  
  
Figure 3b: Linear surface interpolation 
934 
  
  
Figure 3c: Cubic surface interpolation 
  
  
Figure 3d: Quintic surface interpolation 
  
x QQ Qo + 3 
2H O'O HF-QHdPíP-H mn HOE xn 
=HhHHtH DO 
Qo Wn 
OM 4 HF-QI =O Hn On