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Chapter V 
A) REPORT OF THE NATIONAL RESEARCH COUNCIL 
OTTAWA - CANADA 
Tests No. 1-2-3-4-5-6-7-8-9-10 
by 
G. H. Schttt 
Division of Applied Physics, National Research Council 
1 INTRODUCTION 
The National Research Council of Canada used Wild RC7 photographs for its 
participation in the International Test on Block Adjustment. 
The photograph size is 140 X 140 mm and the calibrated focal length 100.30 mm. 
Eight west-east strips with a total of 213 photographs at a scale of approximately 
1:80000 were used. 
The test area, located in the Massif Central in France, measures about 80 X 80 km 
and is in part rather mountainous. 
The coordinates of 18 ground control points were received: two each in each 
of the four corners, in the middle of each of the four sides, and in the centre of the 
block. 
The photographs were first measured in a Zeiss Jena 1818 Stereocomparator. 
This was followed by analytical aerial triangulation and block adjustment by methods 
developed at the National Research Council. 
Subsequently, the photographs were measured in a Nistri ТАЗ Stereocomparator. 
The same methods of analytical triangulation and block adjustment were employed 
here. 
Finally, the photographs were triangulated in a Wild A7 Autograph and the 
obtained strip coordinates were used in block adjustment. 
For the Nistri ТАЗ and the Wild A7 adjustments, in addition a few photographs 
of a north-south strip were used. These cover a gap at the eastern end of strip 4. 
A program for vertical block adjustment on the IBM-1620 electronic computer 
had been developed but was not completed in time for use in this test. Rather than 
performing a vertical adjustment by means of a conventional graphical method,