10 
PHOTOGRAMMETRIC ENGINEERING 
Of particular interest is the further de 
velopment of methods which serve to elimi 
nate the systematic errors which may occur 
in triangulated strips by means of corrections 
applied to the photograph coordinates. 
A major problem that still remains to be 
solved is how to satisfy the need of especially 
the many small photogrammetric organiza 
tions for suitable computer programs. Many 
of these organizations have neither the neces 
sary experience nor the access to a sufficiently 
large computer to use large sophisticated 
programs and they would be best served by 
small programs for specific purposes. As yet, 
only the U. S. Coast and Geodetic Survey 
and the National Research Council of Canada 
have made it their policy to publish their 
programs. 
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