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Foreword.
Commission IIl Invited paper
Aerial Triangulation with Auxiliary Data
by Prof. Dr. A. J. BRANDENBERGER
The Ohio State University
Columbus, Ohio, U.S.A.
This report deseribes progress made in the field of aerial triangulation with auxil-
iary data since the Eighth International Congress of Photogrammetry held in Stock-
holm, 1956.
To make this report as complete as possible a questionnaire concerning Subject 4
was mailed to twenty-one photogrammetric institutes and organizations in various
countries.
The following questions were asked in the questionnaire:
Question 1:
D
Question 2:
Question 3:
Question 4:
Question 5:
~
er)
Question
Question 7:
Question 8:
What sort of auxiliary data you use in your organization or your country
in carrying out aerial triangulation (statoscope horizon pictures, radar
profile method, etc.) ?
What progress has been made in your organization or your country in the
field of aerial triangulation with auxiliary data since 1956?
Do you consider the use of new kinds of auxiliary data in the future and
which ones?
How you proceed in carrying out aerial triangulations with auxiliary data
at the plotting instrument? Short description of the procedure.
What kind of ground control and how many points are used to carry out
the adjustment of strips and blocks using auxiliary data?
In case that aerial triangulations with auxiliary data were carried out in
your organization or your country since 1956 what accuracy was attained?
Indicate type of plotting instrument, type of camera, types of auxiliary
data, flying height, number of models per strip, ete.
How much time per model was required to carry out aerial triangulations
with auxiliary data?
Are you able to give information about how the costs for aerial trian-
gulations with auxiliary data compare with the costs for aerial trian-
gulations without auxiliary data?
Answers to the questionnaire were obtained from the following:
Canada:
Finland:
France:
Germany:
Holland:
Italy:
Sweden:
Switzerland:
T. J. Blachut, Chief, Photogrammetric Research, National Research Coun-
cil of Canada, Ottawa.
Dr. V. Erola, Director, Photogrammetric Division, General Survey Office
of Finland, Helsinki.
M. H. Bonneval, Ingénieur en Chef Géographe, Inst. Géographique Nat'l.
Paris.
Dr. Ing. W. Brucklacher, Zeiss-Aerotopograph, Heidenheim/Brenz.
Ir. G. H. Ligterink, Technische Hogeschool, Laboratorium voor Geodesie,
Delft.
Prof. L. Solaini, Director, Institute of Geodesy, Topography and Photo-
grammetry, Politecnico, Milano.
Dr. B. Hallert, Professor of Photogrammetry, Kungl. Tekniska Hogskolan,
Stockholm.
Dr. M. Zeller, Professor of Photogrammetry, Federal Institute of Tech-
nology, Zurich.
An
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