tion is affected by elevated features suchas trees and buildings. This, 
in turn, has some effect on the geometry of the orthophoto image of the 
terrain surface near these features. In order to evaluate this effect 
for the orthophotos produced on the Gestalt Photo Mapper, a number of con- 
trol points were selected within a distance of 1 mm (at 1:10 000 scale of 
the original photos) from the elevated features. The standard errors for 
these points for both orthophotos are listed in Table V in addition to 
the standard errors calculated for all points. 
  
Mo number 
of 
Instrument :10 000 points 
  
Galileo Orthophoto Simplex 0.032 mm 75 
Gestalt Photo Mapper I and II test not applicable 
Kelsh K320 (10 mm slit)** .042 28 
Kelsh K320 (5mm slit) .033 70 
Ortho SFOM 9300 .065 55 
Wild Avioplan ORI .034 63 
Wild PPO-8 ‚024 82 
Zeiss GZ-1 „026 57 
Zeiss Ortho-3 .041* 29 
Zeiss Jena Topocart/Orthophot ‚025 
OOO OO OO Oo OO 
**_ ess experienced operator *results for photo 33 
was used only 
  
  
  
  
  
TABLE IV. Radial components mp of standard errors for points 
located within 0.25 mm (at the scale of the original 
photos 1:10 000) from the scanned profile 
  
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