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Introduction
During the latest four years the state of photogrammetry has
been rather stable. The number of organizations and the number
of people engaged in photogrammetric work have been fairly
constant. Nor have the number of photogrammetric instruments
changed during the period.
A pronounced development has taken place within the field of
orthophotography with a three times increased productivity.
Also methods of producing line maps have been developed. A con-
siderable increase in the need of numerical data from stereo
instruments can be observed. Subsequent calculations are made in
high-speed computers and automatic co-ordinatographs are often
used to present the results.
Automatic methods have been applied to a very great extent for
the handling of aerial film and for the production of photo
materials of different kinds.
Research work has been carried out concerning camera and instru-
ment calibration, photographic image quality and the applica-
tion of photogrammetry to special purposes.
Photo-interpretation and remote sensing methods have gained an
increased importance. Different applications have been investi-
gated.
Aerial Photography
Practically all aerial photography for mapping and measuring
purposes in Sweden is performed by the Geographical Survey
Office (RAK) and all the negatives from the aerial photography
are stored centrally. Consumers can order aerial photogrammetric