Full text: Proceedings of a symposium held at University College London, 9 - 13 August 1971

   
Analytical Block Aerial Triangulation System 
by Medium-sized Computer 
   
  
   
   
    
    
    
    
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
by 
Hiroshi MORITO 
(Pacific Aero Survey Co., Ltd.) 
Abstract 
edo This paper describes analytical block aerial triangulation system developed by our 
- Lv firm. We are confident of high practicability on our systems. 
We defined practicabilities as follows; 
1) All of operations concerning aerial triangulation are to be symplified, auto- 
matically worked and moreover each system function is to be worked sys- 
tematically. 
2) Whole system should be superior to non-block method as to economy and 
accuracy. 
3) Computer size to be used should be selected considering payability. 
Aiming to meet with practicabilities above, the key procedure described here is to 
solve by least square method simultaneously two conditional equations; one to determine 
absolute condition using control points included in a block and another to determine 
relative condition between course using tie points, in the stage of conversion from 
e strip coordinates in aerial triangulation to geodetic coordinates. Instrumentations 
t used are Zeiss Stereocomparator and Japanese made computer ‘“’TOSBA C-3400”, 
-— 
  
Introductory Notes 
In 1963 a small-sized computer, OKITAC-5090 was installed at the 
Pacific Aero Survey Co., Ltd., and it started operating primarily for car- 
rying out the mean computation work of aerial triangulation. At that 
time, relative orientation and successive orientation of aerial triangulation 
were performed by first order plotting instrument, and the computational 
work for conversion from strip coordinates to geodetic coordinates, namely 
computation of orientation relative to the ground was mainly carried out 
by the computer, as a general practice. 
Subsequently, in 1966 a stereocomparator was introduced, and it be- 
came possible to adopt a real analytical method, thereby to improve the 
efficiency considerably. 
However, due to expansion of our company activities, and because of 
technological improvements as well as improvement of the computer per 
se, the former machine was replaced by a medium-sized computer 
TOSBAC-3400 system, equipped with one set magnetic disc pack device, 
which served as an auxiliary memory, in 1968. 
  
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