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5. A working group within commission VI of ISP is preparing a 
bibliography on data processing programs to be reported to the 
Lisbon congress. The group is led by Dr P. O. Fagerholm. 
Organization and Personnel 
The number of organizations engaged in photogrammetry has in 
creased. Appendix 1 lists the major organizations. These employ about 
300 persons who are directly engaged in photogrammetric work. The 
number of persons who are partly connected with photogrammetric 
activities is naturally much larger. 
Research and Education 
Research in Sweden so far has been conducted partly on the funda 
mental level at the Royal Institute of Technology in Stockholm and 
partly as applied research at the Royal Institute of Technology and 
institutions and organizations actively engaged in photogrammetric ac 
tivities. 
The Photogrammetric Division of the Royal Institute of Technology 
in Stockholm, took active part in the Ninth International Congress in 
London and contributed papers and discussions in commissions num 
ber I, II, III, IV and V. The head of the Division has been directed 
by the International Society of Photogrammetry to continue and finish 
the project concerned with the terminology of the theory of errors in 
photogrammetry. The Swedish Society of Photogrammetry has also 
entrusted the head of the Division with the task of leading a working 
group on fundamental problems under Commission II. Further, the 
Photogrammetric Division has worked out the principles of determining 
tolerances for photogrammetric instruments and methods. 
A number of investigations of the various stages of the basic opera 
tions of photogrammetry have been carried out. Special mention may 
be made of the tests conducted on the photographic material from the 
Geographical Survey Office’s aerial cameras (Olands field), tests done 
on the processing instruments, and tests on the cameras for various 
purposes for example under-water photography. Much interesting 
work has been done on the specialized application of photogrammetric 
technique particularly in the fields of medicine and odontology. One 
of the engineering applications that has been used is the photogram 
metric measurement of road surfaces during times of breaking up the 
frost. 
Research activities at the Universities of Stockholm and Lund have 
mainly been directed on photo interpretation and its methods in the 
fields of geo-morphology, classification of soils etc. 
The Geographical Survey Office continuously performs routine 
tests of the aerial cameras.