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PHOTOGRAMMETRIC PLOTTING INSTRUMENTS. 
4.1 Accuracy of instruments /to be specified according to 
types of instruments/. 
4.lla Is accuracy of instruments checked? 
4.llb How frequently? 
4.122 Is it checked by grid measurement? 
4.l2b Is it checked by plotting of a standard stereopair? 
4.12¢ Is it checked by other methods? 
4.13 Are there fixed tolerances for accuracy of instruments? 
4.2 Exploitation of instruments. 
4.21 By how many operators are the instruments run? 
4.22 For how many hours per day are the instruments 
exploited? 
GROUND CONTROL POINTS. 
Bel Number of ground control points per photopair: 
5.2 Method of determination of ground control points 
coordinates. 
Are coordinates and heights of ground control points 
determined: 
5.21a by ground control? 
5.2lb by radial triangulation? 
D.2lc by aerotriangulation? 
5 e222 Are there fixed tolerances for the accuracy of ground 
control points determination? 
5.23 Tolerances: 
PLOTTING. 
6.1 Orientation of photographs. ; 
6.11 How is it carried out? /optical-mechanical method, 
6.12 
Are there tolerances for relative orientation? 
  
numerical method, etc./