The Geographical Survey Office. 
The activity of this institution is given an account of in the publication 
No. 45 »Aerial Photogrammetric Activities at the Geographical Survey 
Office». Rikets allmánna kartverk, Meddelande nr 7, issued for the Hague 
.congress 1948. 
Since-1948 a certain extension of the activity bas taken place, but no 
great changements concerning organization and methods have been made. 
The aerial photographic department disposes of 4 aeroplanes and a considerable num- 
ber of aerial cameras, chiefly of the type Zeiss RMK 20. 30/30. Complementary additions 
to the plotting instruments have been made during the last few years and they now consist 
of 4 autographs Wild A6, 1 autograph Wild A5 and 1 Zeiss stereoplanigraph. 
The principle task of the Geographical Survey Ofice from a photogram- 
metric point of view is to compile a photo-map of Sweden, intended as a 
base-map for other maps, scale 1 : 10.000 and less. The institution has a 
special order division, which has been considerably developed during the 
period in question. Its turnover has increased from 344.573 Sw. crowns 
1948 to 562.700 Sw. crowns 1951. 
In connection with the activity of the Geographical Survey Office a con- 
siderable research activity has been pursued. 
Certain questicns of practical importance have been treated in the pub- 
lications No. 46 (concerning the inner orientation of cameras) and No. 49 
(correction of the distortion cf the aerial camera when plotting in multi- 
plex.) No. 52 treats the distortion of the Aviotar objective and the resulting 
errors in the model. Some new points of view on the importance of re- 
fraction in photogrammetry are set forth in No. 33. A theoretically interest- 
ing and practically valuable methed of photogrammetric triangulation is 
presented in No. 33. 
The Land Survey Board. 
During the period 1948—1952 the photogrammetric activity within this 
organization has undergone a considerable development. The aerial photo- 
grammetric mapping fcr cadastral survey purposes has nowadays devel- 
oped to a regular method, and every year an inereasing area is surveyed 
on large scales (up to 1:1.000) by this method. 
At present the organization owns 1 autograph Wild A5 and 1 autograph 
Wild A6, and in additicn to these instruments it has another autograph 
Wild A5 at its disposal during certain periods. 
The first map compiled in this country, which was approved as a basis 
for planning by official authorities, is described in No. 12. Moreover the 
activity of the Board is treated in the publications No. 35, 36, 38, 63, 68, 
69 and 70. In No. 71 an account is given of a research work concerning 
photogrammetric maps on large scales for cadastral survey purposes. 
Other Organizations. 
Aerial photographs, and maps produced on the basis of them, are used 
by a considerable number of public and private organizations, among 
which the following institutions may be noted: 
    
  
   
   
   
   
  
   
   
   
   
  
  
  
  
   
   
  
   
  
  
  
  
   
  
  
  
   
    
   
   
  
  
   
  
  
  
  
  
   
  
  
   
   
  
  
  
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