PROGRESS REPORT 
  
OF THE 
WORKING GROUP ON IMAGE GEOMETRY 
Dr. Hartmut Ziemann 
Photogrammetric Research 
National Research Council 
Ottawa KIA OR6 
Canada 
ABSTRACT 
This report reviews results obtained by members of the Working 
Group on Image Geometry in the evaluation of two lenses for aerial 
photography. It also summarizes an investigation of the effectiveness 
of different lens calibration data for the correction of image 
coordinates. 
1. INTRODUCTION 
The Working Group on Image Geometry was formed in 1973 with the 
intention to carry out repeated lens distortion determinations for the 
same two cameras, using different available instrumentation and pro- 
cedures. During the same year a program involving eleven institutions 
was organised, primarily for 1974. Although it had been hoped that a 
final report would be available for the 1976 congress, it soon became 
evident that this was not possible. 
An overview of the activities of the working group was given at 
the Commission I symposium in Stockholm in 1974, a preliminary report 
[1] submitted to the 1976 congress in Helsinki. The working group met 
in Ottawa in 1975 [2] to discuss the results obtained thus far.