100 AERIAL TRIANGULATION WITH AUXILIARY DATA, BRANDENBERGER 
that strip triangulation with independent geodetic controls cannot yield the same ac- 
curacy as obtained from strip triangulation with given geodetic triangulation points. 
Nevertheless, it was proved by some tests that a remarkably high accuracy can be ob- 
tained with the method of independent geodetic controls. It seems to be recommended 
that this interesting method be further developed. 
h. Stellar photography, doppler tracking, and inertial guidance. 
These systems are eventually able to produce auxiliary data for performing aerial 
triangulation. It is, however, too early to make definite statements whether such systems 
are of substantial help in performing aerial triangulation. Considerable development 
work has to be done to come to more concrete conclusions as to whether these systems 
could be used in performing aerial triangulation. 
i. Dual aireraft mapping system. 
This system uses radar profile recordings and a Shoran-Tellurometer combination 
to measure base distances between two airplanes in flight. In this way auxiliary data 
can be obtained which might be of use in performing aerial triangulation. This system 
represents a new and interesting approach, but it is too early to make statements as to 
whether the system is of substantial help in performing aerial triangulation, since the 
system is still in development state. It is hoped that further de relopment will yield more 
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concrete conclusions about the applicability of the system for aerial triangulation. 
J. Stabilized mount for aerial cameras. 
Some developments are in process to stabilize the mount of aerial cameras in air- 
crafts in such a way that the camera axis remains vertical during the flight. This would 
mean that ideal vertical photographs would be obtained which in turn would facilitate 
the performance of aerial triangulation. Such a system would not directly yield airborne 
auxiliary data; it is felt necessary, however, to mention this system in this report. It 
remains to be left to the future development to clear up if by a stabilized mount of aerial 
cameras a sufficiently high degree of accuracy for the verticality of the camera axis can 
be reached. 
ABSTRACT. 
This report describes progress made in the field of aerial triangulation with auxiliary 
data since the Eighth International Congress of Photogrammetry held in Stockholm, 
1956. To make this report as complete as possible a questionnaire concerning this matter 
was mailed to twenty-one photogrammetric organizations in various countries. Answers 
were obtained from fourteen different reporters. From these answers follows that the signi- 
ficance of aerial triangulation has considerably increased since 1956. New systems of 
producing auxiliary data are under investigation with special emphasis on electronic 
measuring devices. 
RESUME. 
Le but de ce rapport est de donner un compte-rendu du progrés qui était fait dans 
le domaine de la triangulation aérienne avec des donnés auxiliaires depuis le 8»e Congrés 
International de Photogrammétrie qui a eu lieu en 1956 à Stockholm. Pour faire ce rap- 
port aussi complet que possible un questionnaire concernant ce sujet a été envoyé à 21 
organisations photogrammétriques se trouvant dans de pays différents. Des réponses de 
14 rapporteurs ont été recu. Ces réponses montrent que l'importance de la triangulation 
aérienne avec des données auxiliaire a augmenté considérablement depuis 1956. De nou- 
veaux systémes pour produire des données auxiliaires sont en train d'étre étudiés et l'on 
considére de plus en plus des méthodes de mensuration par voie électronique. 
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