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Ihe Effects of Environmental Conditions on Distortion, Calibrated
Focal Length and Focus of Aerial Survey Cameras.
Dr.-Ing. H.-K. Meier, Oberkochen.
1e Introduction
Calibration of instruments and surveying tools in general means
the definition of the system-specific parameters under specified
conditions, i. e. in the laboratory. It is obvious that in
practical use different conditions may occur. If the influences
of these deviations are known they can be allowed for by
corrections, Otherwise they should become subject of scientific
research.
Ihe essential parameters for aerial cameras are:
- distortion
- calibrated focal length and
- focusing
They are influenced by the conditions of the photographic flight,
especially by air pressure and temperature. Parameters present
under practical photoflight conditions should be determined in
the following steps:
a) Calibration under Specified conditions in the laboratory
b) Investigation of the prevailing photoflight conditions,
especially as regards pressure and temperature
c) Theoretical considerations concerning the variations to
which distortion, calibrated focal length and focus are
Submitted by the above conditions
d) Examination of the developed theories in practical tests.
e) Adaption of the system data gained by laboratory cali-
bration to the respective flight conditions
