Presented Papers 
Authors: Mrs. Aino Savolainen (Finland) 
Mr. R. Ruotsalainen (Finland) 
Title: Experiences of the ISP Standard 
Tests PP 11/43 
In delivering her Paper, Mrs. Savolainen pointed 
out that one problem is that of the accuracy of 
grid plates. Here Dr. Meier informed the audience 
that grid plates with maximum errors of less 
than one micrometer are now available. 
Author: Mr. H.-D. Janssen (F.R.G.) 
Title: Bemerkungen zum Standardtest fiir 
Komparatoren PP 11/22 
Upon Mr. Janssen’s presentation, Mr. Grabmeier 
pointed out that only the affinity error had been 
considered. Mr. Janssen answered that a more 
sophisticated mathematical model would be 
necessary. 
COMMISSION III 
MATHEMATICAL ANALYSIS OF DATA 
Author: Dr. K. Szangolies (G.D.R.) 
Title: On the Definition of the Accuracy 
of Stereoplotters PP // /58 
Upon Dr. Szangolies' presentation Dr. Meier 
pointed out, that for the user it is more important 
to test his own instrument for a prospective 
problem, than make tests between several instru- 
ments. 
Dr. Macarovic (Netherlands) mentioned, that 
from the very beginning it was clear, for the WG 
Il/2, that it is necessary for the user to test his 
instrument for several input materials. 
The chairman closed the session after recom- 
mending the use of I.S.P. Standard Tests and 
after announcing that Working Group 11/2 had 
finished its activity. 
ASPECTS MATHEMATIQUES DU TRAITEMENT DE L'INFORMATION 
MATHEMATISCHE GESICHTSPUNKTE DER INFORMATIONSVERARBEITUNG 
President: Dr. F. Ackermann (F.R.G.) 
Secretary: Dr. H. Bauer (F.R.G.) 
Tuesday, July 13, 1976, from 14.00 to 15.30 
Session 1 of Commission Ill 
Topic: Aerial Triangulation (1): State of De- 
velopment, Auxiliary Data, Point 
Transfer 
Chairmen: Dr. F. Ackermann (F.R.G. 
Dr. H. Bauer (F.R.G.) 
Invited Paper 
Author: Dr. F. Ackermann (F.R.G.) 
Title: On the Development in the Field of 
ISP Commission Ill during 1972— 
1976 CR 111/01 
Dr. Ackermann reviewed past and current devel- 
opments, reaching the conclusion that, after a 
long and intensive period of development, the 
final goals sought in this area had nearly been 
achieved and that future efforts should be con- 
centrated on: use of minicomputers for aerial 
triangulation; refinement of self-calibration pro- 
cedures; comparison of mono- and stereocom- 
parators; determination and accuracy of per- 
spective centers in analogue instruments; inves- 
tigation of point transfer problems; and detection 
and elimination of gross data errors. 
Then Dr. Ackermann proceeded to give a brief 
summary of the following Presented Papers, for 
the full presentation of which there would not 
have been enough time. 
96 
Author: Dr. I. Antipov (U.S.S.R.) 
Title: Automated System of Processing 
Photogrammetric = Measurements 
PP 111/108 
This article dealt with strip and block triangula- 
tion. 
Author: Mr. M. Allam (Canada) 
Title: Photogrammetric Deformation of 
Lake Surfaces Caused by Air Tem- 
perature Differential over Water 
Bodies PP 111/104 
Here the author discussed the effects of special 
errors in APR measurements of lake shore points, 
due to the refraction effect on the rays at the 
interface between cold and warm air layers which 
develop during the exposure of aerial photo- 
graphy. 
Authors: Dr. H. Ebner (F.R.G.) 
Mr. R. Mayer (F.R.G.) 
Title: Numerical Accuracy of Block Adjust- 
ments PP 111/120 
In this work it is shown that a word length of 60 
bits is sufficient in computers for the computa- 
tional purposes of block adjustment. 
Author: Dr. W. Faig (Canada) 
Title: Independent Model Triangulation 
with Auxiliary Vertical Control PP 
121