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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
Considering the above results, following remarks can be 
concluded; 
* DEM accuracy between 1-5m is enough to get 
eligible results. 
e High resolution satellite images can provide 1:2500 
and smaller scale orthophoto production when only the image 
quality is considered, but are eligible for 1:10.000 and smaller 
scale topographical mapping when the geometrical accuracy is 
considered (0.5m. geometrical accuracy is needed for 1:5.000 
scale cadastral mapping in Turkey, according to the existing 
specifications). 
e Although the better resolution and image sharpness of 
Quickbird image (figure 5), polynomial constants in May 2002 
need to revising. 
¢ Optimum output scale of orthophotos can be seen in 
figure 6. 
  
  
Figure 5(b). Orthophoto from QUICKBIRD (1:1.000) 
  
    
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Figure 6(b). Orthophoto from IKONOS (1:3.000)