(362) 
The German report referred to a report of the Luft Hansa activities. The 
time for complete operations per model on the Stereoplanigraph is given as 9 
hours 50 minutes; composed of preparation, 40 minutes; relative orientation, 
17 minutes; absolute orientation, 23 minutes; plotting 8 hours 30 minutes. This 
refers without doubt to models at 1 : 20,000 for the 1 : 25,000 map. This point 
was not definite. 
The statistics given in the Austrian report are as follows for a 1 : 50,000 
sheet (about 500 sq. km.); 4065 days of work of ten hours composed of 620 
days of signal building and topographic operations, 795 days of control obser- 
vations and calculations, 650 days of air triangulation and plotting, 2000 days 
of field completion on the ground. This refers to plotting at 1:10,000 for maps 
ac 1:25,000. 
The IGN of Brussels gave 15 hectares per hour per machine (0.06 of mile), 
as speed of production for the 1 : 25,000 map. 
The Netherlands gave only the area plotted without any data on produc- 
tion speed; since 1948 10,000 km? on 1 : 10,000 and 1 : 16.666, the larger part 
by rectification. 
In Sweden for line maps (in contrast to photo mosaics) at 1 : 10,000 with 
> meter contours between 1 and 10 hours are necessary per square kilometer. 
Other figures furnished concerned only photo mosaics at 1 : 10,000. 
The American report furnished no general statistics but information on 
two particular surveys: 
For the first, area 849.5 square miles (2,210 km”). Contour interval 10 feet; 
scale of map 1 :25,000, of photographs 1 : 12,000, plotting 1 : 5,000: stereos- 
. 9 . B ” 
copic models: mean area per model 2.25 km?; Ratio - 0.73: Camera 6” T5. 
H 
The pass points were determined by air triangulation on the Stereoplanigraph 
and the plotting was done by the Multiplex. Total time 29,160 man hours — 
average number of hours per model 30 hours; per square mile (2.6 km?) 34 
hours 3 minutes; the percentage of time for the operations follows: Air photo- 
graphy, assembly of geodetic control and laboratory photography, 3%; Field 
inspection, 6% preparation of data, projections and other preparatory opera- 
tions 5%; air triangulation 27%: plotting 27%; Compilation of multiplex plot 
12%. 
Another example furnished by another American organization reports 
number of hours per square mile. 
Ground control 2 hours and 8 minutes. 
Plotting of planimetry and contours 
for 10 foot interval 27 hours 1 minute 
20 »5 9g 020 
40 , 3 Zu «6 >, 
The scale of the negatives and the maps were not given. 
The Swiss reported only the areas surveyed since 1948: 15,000 km? for the 
national map 3500 km? for the cadastral map. The cost of photogrammetric 
surveys averaged between 60% and 80% of planetable surveys costs, 
The report of Finland states 217,000 km? covered by the end of 1951 at 
1:20,000 scale. Controlled photo mosaics existing then were 87,400 km? at 
1:20,000; 37,000 km? at 1:10,000 and 4.800 km? at 1 : 5,000. 
Italy reports about 14,000 km? of 1 :25,000 surveys by the IGM since 1948 
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