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Figure 4. Section along a road on 1:2.000 map scale 
About the 1:500 maps related to the centre of the city, the only possible comparison is along a road because 
there are not any no building areas (see Fig. No.5). 
  
  
  
  
  
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Figure 5. Section along a road on 1:500 map scale 
B) BUILDED AREA 
Also in this case two test areas has been chosen, the first one on 1:500 map and the second one on 1:2.000 map 
(see Fig. No.6 and No.7). It is possible to point out that the Vertical (height) differences are no more than 30-50 
cm. while the Horizontal (planimetric) differences are less than the accuracy related to the different scale maps. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000. 137