No 
Photogrammetric Plotting Instruments. 
    
     
   
     
   
   
     
   
  
  
   
    
    
    
     
     
   
   
   
  
4.ll& 1s accuracy of instruments checked? Specify the types. 
Yes 61 Not answered 
No 
Instruments used: Type: Number of users: 
AMS M-z 1 
Comparator STXK12 1 
Kelsh 4 
Multiplex 1 
OGM 1 
SOM Stereoflex 1 
SOM otereotopograph D 4 1 
Wild A 7 5 
A 8 e 
: B 8 1 
Zeiss C5 2 
Zeiss C 8 1 
Zeiss S MG 1 
18% order instrument 2 
11174 order instrument 1 
49 organizations did not answer. 
4.llb How frequently are the instruments checked? 
1 month 3 1 year 11 
2 months 3 2 years 2 
3 months 12 For every 
4 months 1 project i 
6 months 17 Irregularly 4 
8 months 1 Not answered 8 
Is accuracy checked by grid measurement? 
Yes 56 Not answered 3