e 9 
e © 
= es A a eis MAR P CUR cde nn: aeg vero d ME HI eH ue VERDAD, roe d Doni Sonn NB 
a ER MAU N PNE A OO A CM RE E DL DA OU 
After this processing it should be possible to verify the 
shift of the principal point of autocollimation of approximately 
50 ym and the accompanying shift of the point of best symmetry 
for the Pleogon lens. This shift is indicated by comparing 
calibrations 1, 4 and 8 carried out at the National Research 
Council in Ottawa. 
The author thankfully acknowledges the support given by the 
members of the working group and in particular, that by Dr. D.C. 
Merchant. 
5. REFERENCES 
l. Ziemann, H., Preliminary Report of the Working Group on 
Image Geometry. International Archives for Photogrammetry, 
Helsinki 1976. 
2. Ellenbeck, K.-H., Tagung der Arbeitsgruppe "Bildgeometrie". 
Bildmessung und Luftbildwesen 44, 2, March 1976, pp. 77 & 78. 
3. Ziemann, H., Guest Editorial, Photogrammetria 33, 4, August 1977, 
PP. 113 & 114, 
4. Hakkarainen, J., Image Evaluation of Reseau Cameras. Photo- 
grammetria 33, 4, August 1977, pp. 115-132. 
5. Martin, W.C., Determination of Optical Transfer Functions by 
Direct Measurement.  Photogrammetria 33, 4, August 1977, pp.133-144 
6. Rosenbruch, K.-J., Considerations Regarding Image Geometry and 
Image Quality.  Photogrammetria 33, 5, October 1977, pp. 155-169. 
7. Gliatti, E.L., Modulation Transfer Analysis of Aerial Imagery. 
Photogrammetria 33, 5, October 1977, pp. 171-191. 
8. Ziemann, H., Visual Calibration of Reseau Cameras. To be 
published in Photogrammetria. 
9. Hakkarainen, J., Determination of Radial and Tangential Distortion 
of Reseau Cameras with the Helsinki University of Technology 
Horizontal Gonimeter. To be published in Photogrammetria. 
10. Carman, P.D. and H. Brown, The NRC Camera Calibrator. To be 
published in Photogrammetria. 
23