Characteristies of the computation proceeding 
Program characteristics 
Time required for measuring and computing each model 
Introduction of auxiliary data in’ computation 
Electronic computer used 
Number of measurement repetitions 
Adjustment of results: method 
Number of ground points used for adjustment 
Remarks on the reached precision 
List (if possible) of triangulated blocks including the following information 
for each group of blocks 
number — length — number of longitudinal and transversal strips — 
flight altitude — overlap and sidelap — cameras — survey purposes — 
ground characteristics — instrument used for measuring coordinates — 
further information 
2.2.3. — Triangulated blocks with the radial method 
Flight characteristics 
Number and position of ground points 
Auxiliary equipments 
Instruments used for measuring plates 
Characteristics of the computation proceeding 
Time required for measurements and computations 
Adjustment of results 
Remarks on the reached precision 
List of triangulated blocks with radial method including the following infor- 
mation for each group of blocks 
number — length — flight altitude — photo-scale — overlap and 
sidelap — survey purposes — ground characteristics — instruments 
used — further information. 
Sent out in November 1959, this questionnaire besought information relating 
to the use of triangulation beginning January 1956 up to the end of 1959. 
b) Much to this Commission's great satisfaction, a wealth of detailed information 
began to pour in beginning February 1960. 
However, in spite of repeat pressure for a reply, both by circulars or personal 
letters, not all Questionnaire recepients and above all, not all the Commission rappor- 
teurs did oblige with a reply. 
The general collection of replies is contained in Table 1 under the caption « Gene- 
ral information ». 
As customary, the circulars were addressed within the sphere of Countries Mem- 
bers of I.S.P. Thus, the information secured, chiefly concern those Countries. 
We must bear in mind, however, that vast zones of evidently intense photogram- 
metric activity have been left out from the gathering field of information. 
Such zones are, perchance, the very ones presenting a greater photogrammetric 
interest, exactly because an ever encreasing need of a cartography is felt as more urgent 
with every day passing. 
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