Mauro Caprioli 
  
  
Figure 3. 3D representation of DTM based on Laser Data of Pavia town 
4. COMPARISON EXECUTED 
Both the Laser data and the existing cartography representation has been compared from metric point of view in 
order to carry out the possible differences and individuate the weak point, if any. Two test areas has been 
selected, taking in account the different characteristics of the territory, such as: 
A) NOT BUILDED AREA 
Within the two different maps scale two areas without buildings has been localized in order to make possible a 
comparison only on the ground surface. 
In the two Sections at 1:2.000 scale and at 1:500 scale (see Fig. No.4 and No.5) the difference are shown up, at 
different scale for horizontal line and for the Vertical line. 
  
136 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000.