89 
5 — DURATION OF THE DIFFERENT WORK STAGES 
18% man-days 
14 man-days 
1 man-days 
33% man-days 
Observations in the Stereo-comparator: 163 hours for one observer and one as 
sistant (together thus 326 man-hours). 
The assistant was required here because in the period concerned (June/July 
1961) the EK-4 automatic recording apparatus was not always working properly. 
At present, with a rather smooth working EK-4, the Stereo comparator EK-4 combin- 
ation does not require more than one operator. 
Computation in the Zebra: 
strip-coordinates (van den Hout programme) 21 hours 
transformation combined with curvature correction 4 hours 
Ackermann-programme for heights 6% hours 
31% instrument hours 
(including 1 machine operator) 
Computation outside the Zebra: 
trouble shooting, correcting, checking 
lens distortion 
preparation transformation and curvature 
preparation Ackermann-programme 
telex-operator (for correction of the EK-4 tapes and 
making new, « clean » tapes. This would, at pre 
sent, no longer be needed) 
Telex (instrument-hours only) 
(for printing of coordinate lists from Zebra tapes) 
Administration, filing, binding of booklets 
I.T.C.-Jerie Block-adjustment: 
Planimetry (see earlier remark) 460 man-hours 
Heights 113 man-hours 
26 
hours 
8 
hours 
15 
hours 
8 
hours 
20 
hours 
77 
man-hours 
50 
hours 
21 
man-hours 
Preparation of the diapositives: 
point-transfer 
identification and marking of control- and check 
points 
index 
REFERENCES 
[1 ] C. M. A. van den Hout, Analytical Orientation methods, « Bollettino di Geodesia e Scienze affini», Sep 
tember, 1961, pages 418-424. 
[2] F. Ackermann, Zur “Entlcrümmung” von Stereomodellen und Triangulationsstreifen, «Bildmessung und 
Luftbild wesen », 1963, pages 63-69. 
[3] F. Ackermann, Ein Verfahren zur programmgesteuerten Ausgleichung von Triangulationsstreifen, « Bild 
messung und Luftbildwesen», December, 1961, pages 108-123.