3. AERIAL PHOTOGRAPHS. 
  
The aerial photography was performed by the Central Office For Geodesy And Cartography in Czechoslovakia with 
the camera Wild RC5A 15/23 cm. Focal length 152.50 - 0,02 mm. Principal point inside a circle around the photo- 
graph centre with the radius 0.01 mm. Radial lens distortion less than 0.007 mm. Mean photographic resolving 
power 60-20 lines per mm, according to the ISP recommendations. A check measurement of the fiducial marks 
gave the following result (two means of each three measurements). 
  
  
Fiducial x y C © * [] 
Mark No mm min 62 65 
  
  
55 94,065 192.885, No.of fiducial marks 
92,520 406.293 
  
98 306,068 192,907 
92,529 194, 307 
  
"62 94,055 404, 887 
304,521 406,299 
  
  
65 306. 048 404, 907 
304,529 194, 314 
  
  
  
  
  
98 
al 
c1 
  
The Central Office procured 30 sets of diapositives on polyester film and Rikes allmänna kartverk 
in Stockholm the other sets, also on polyeser film, Some participants in the Experiment informed 
us about large film distortions. Other participants did not observe unusual distortions, Hence we 
assembled information about film distortion from all available literature and presented the result 
in an internal report, Unfortunately we had neither time nor funds to publish it for the Congress. 
Mr. Erik Wel ander at Rikets allmànna kartverk in Stockholm performed some investigations in 
the same field. We intend to publish our common results after the Congress. The Finnish report 
"On The Deformation Of Polyester Film" has already been mentioned in section 0. 
4, PARTICIPANTS from 23 Nations and 52 Institutes. 
  
  
  
  
  
The consecutive numbers 1, 2, 3.... are used to identify participants and models. 
Nation and organization No. of meas, models (1/2) Instru - 
| No/Code Organization (Diap.Prag-P, Sthlm-S) 1:3 500 | 1:6 000 | 1:12 000f Sum | ment 
007, Austria 
1/007.2 Dipl.Ing. G. Kastenhofer 14 [1/4 1/1 6 A8 
Kärnten PS 
2/007.4 Stadtvermessung 2/2 2/2 2/2 12 A" 
Wien PS