Fig. L5 : Part of Landsat TM image, 
band 4, Dec 86, showing a network 
in Egyptian desert region, 4*5 km 2 
Fig. L6 : Road network extracted 
from Fig. L5 according to the 
generic model of Case Study 1 
Fig. D1 : Part of a mountainous 
Spot image, XS1, Aug. 87, Portugal 
corresponding to a 2.5 km 2 area 
Fig. D2 : Result of applying TON 
operator to Fig. D1 
Fig. D3 : DTM corresponding to 
Fig. D1 and extracted contour line 
657 
Fig. D4 : Road outline obtained 
by iconic deformation