enormous engineering works which as a consequence have been projected for the 
future, have required and still require a considerable amount of photogrammetric 
mapping work on a large scale of the whole endangered area in the south-western 
part of our country. Furthermore this Service continued its activities for the B.P.M. 
and for public agencies in the Netherlands. 
K.L.M. Aerial Surveys became a separate, private company under the name of 
K.L.M. Aerocarto. It carries out aerial photography and mapping as contractors, not 
only in the Netherlands, but also in its overseas territories and in several foreign 
countries. 
It should furthermore be mentioned that the Cadastral Service of the Nether- 
lands has decided to accept photogrammetry as a standard method of surveying and 
intends to establish a photogrammetric organization. The Netherlands Government 
is still considering as to how this new photogrammetric service and the existing 
organizations should cooperate, so as to ensure the maximum benefit of all experience 
gained in the past and of all equipment available in the country. 
CHAPT. I. AERIAL PHOTOGRAPHY. 
Table I indicates the photography carried out for mapping from 1952 until the 
end of 1955, All aerial photography mentioned in this table has been carried out by 
KLM Aerocarto; even the photography 1:20.000 for the Military Topographic 
Service was not carried out by the Military Air Force, but by this private, civil 
organization. This has been done because experience has taught us that with such a 
private civil organization there is more guarantee for the permanent availability of 
a well-trained and experienced crew than with military organization, as they suffer 
much more from changes of personnel. There are also other considerations which 
made that during the last 10 years this method has been preferred. 
The camera types in use are: 
Wild RC5 18 x 18cm Aviotar, f — 21 cm, film. 
Wild RC5 18x 18 cm Aviogon f —11,5 cm, film 
Wild RC 5a 9 x 9 inch Aviogon, f — 6 inch, film. 
Wild RC 7 15 x 15 em Aviotar, f —17 cm, plates. 
Wild RC 7 15x 15 em Aviogon, f — 10,0 cm, plates. 
Williamson OSC 9 x 9 inch, Ross survey lens f — 6 inch, film. 
Zeiss P. 10 18x 18 cm Topogon f — 10 cm, film. 
Air photography in the Netherlands itself is carried out exclusively with Wild 
cameras. The Wild RC 5 18 x 18 cm f — 21 cm Aviotar film camera is used for the 
topographic mapping in the Netherlands in the scale of photography 1 : 20.000. Of 
the 16.000 sq.km of this type of photography there is 15.000 sq.km used for map 
revision and 1000 sq.km for construction of new maps in a scale of 1 : 25.000. The 
Topographic Service has also considered the possibility to use for the construction of 
the map 1 : 25.000 photographs in a smaller scale, made with the wide-angle Aviogon 
RC 5. The result, however, of this study has been the preference for the scale of 
1 : 20.000, obtained with standard angle, notwithstanding the fact that the resolving 
  
  
  
  
  
  
  
  
  
  
  
  
  
   
    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
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