ANALYTICAL METHODS IN SPECIAL APPLICATIONS 
OF PHOTOGRAMMETRY 
PRACTICAL EXPERIENCES FROM MODEL MEASUREMENTS 
FOR THE ROOFS OF THE OLYMPIC SPORT FACILITIES 
Ing, H, D. PREUSS, M, Sc. 
University of Stuttgart 
The process of finding a workable method for the photogrammetric measurement of complex objects begins with the eva- 
luation of the basic conditions of environment, physical properties of the object, the object data requested and the accu- 
racy requirements. The development of an analytical close-range photogrammetric procedure, used to transfer the mo- 
dels of the prestressed cable-net roofs of the sports facilities for the Olympiad 1972 at Munich, is described to illustrate 
some important aspects of the method finding process and measures that may be applied to improve the quality of the 
results. 
La recherche d'une méthode convenant au relevé d'objets complexes doit comporter d'abord une étude de l'envi- 
ronnement, des dimensions, de la structure et des propriétés physiques de cet objet, ainsi que de la précision recher- 
chée. Une méthode analytique de photogrammétrie à courte distance appliquée aux modèles de construction des réseaux 
précontraints pour les centres sportifs olympiques à Munich est décrite ; cet exemple permet d'illustrer les aspects 
techniques et méthodologiques du problème et de présenter les mesures prises pour augmenter la qualité des résultats. 
Sonderanwendungen der Photogrammetrie unterscheiden sich durch besondere Ausgangsbedingungen - Umgebung 
des Objekts, seine Dimensionen und seine Struktur, die verlangten Daten und die Genauigkeitsforderungen - von üblichen 
photogrammetrischen Projekten. Am Beispiel der Übertragung der Modelle der vorgespannten Seilnetzkonstruktionen der 
überdachungen der olympischen Sportstätten in München in die Ortlichkeit mittels analytischer Nahbereichsphotogram- 
metrie werden wesentliche Stufen in der Entwicklung einer Arbeitsmethode und Massnahmen zur Steigerung der Qualität 
der Ergbnisse aufgezeigt. 
  
Introduction 
The field of application of photogrammetric techniques to the compilation of metric data 
of inaccessible or complex objects and to recording and measuring changing or instantaneously 
occurring phenomena ranges into industrial production processes as well as scientific research 
areas where photogrammetry was still unknown some years ago, Whenever photogrammetry is 
employed to solve problems unrelated to surveying or geodesy we do speak of "special applica - 
tions of photogrammetry''. If we neglect the historical ties of photogrammetry to geodesy and 
surveying and the fact that most photogrammetric instruments and techniques have been developed 
to present day standards to satisfy primarily the needs of aero-triangulation and mapping, we will 
still find the attribute "special" appropriate, 
Let us consider an engineer who chooses photogrammetry to measure vibrations of a 
helicopter blade. He will neither have a standard photogrammetric approach to the problem, nor 
an established routine for photographing his object, nor can he utilize general photogrammetric 
experience, He is confronted with a task that calls for a special approach, special equipment and 
considerations of conditions not found in ordinary photogrammetric projects. 
The environment and the physical properties of the object and the object data requested, 
together with specific accuracy requirements, may be regarded as basic conditions, With these, 
and the available photographic and photogrammetric instrumentation in mind, initial decisions 
have to be made about the type of photography and the methods of reduction and evaluation, Then 
an estimate of the a priori accuracy that may be expected can be made, If the accuracy require- 
ment of the basic conditions is not met the chosen method has to be reconsidered step by step and 
attempts have to be made to strengthen the weakest link of the chain of events that leads to the 
  
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