INTERNATIONAL SOCIETY FOR PHOTOGRAMMETRY 
SUB-COMMISSION IV:4 
  
ADDITIONAL REMARKS 
TO THE GENERAL REPORT 1960: FUNDAMENTAL QUESTIONS IN RELATION TO CONTROLLED 
EXPERIMENTS. COMPARISONS WITH SOME RESULTS FROM 
SUB-COMMISSIONS IV:1 AND IV:3 
L. OTTOSON B. HALLERT C. O. TERNRYD 
ASSOCIATE PRESIDENT ASSOCIATE 
Introduction 
After the publication of the IV:4-report about June 15th 1960 some additional data of great value 
for checks of the accuracy estimations of IV:4 from y-parallaxes have been received from IV:1 and 
[V:3. The results of the comparisons are demonstrated below. 
Sub-commission IV:1 (Monti di Revôira). 
[n a message dated Aug. 2nd 1960 the Secretary of IV:1 among other things sent a detailed compari- 
son between the mean square values of discrepancies in x-y- and z-coordinates for 15 models from the 
controlled tests Monti di Revóira (9 models from the R.C.5a- and 6 from the R.C.7a-camera) and the 
mean square values of measured y-parallaxes in 15 points of each of the models, referred to the 
[V:4-report. In the table p. 28 of the IV:4-report the results from IV:1 represented averages of all 
tested models. y-parallax measurements for IV:4 had been made in a limited number of models only. 
Therefore a comparison between the results from IV:1 and [V:4, referring to identical models as 
demonstrated below, must be more correct. 
  
  
  
  
  
Table 1 
| | Averages of mean square 
| values of discrepancies 
Camera etc. Coordi- on the ground in mm Dir. mm 
| nates _— IV:1—IV:4 
| IV:4 | IV:1 
| | (from y-parall.) (geod.) 
| | 
RC5a 11.5/18 X | 95 | 92 —3 
Film | y | 95 | 104 -9 
| z | 126 184 -58 
| 
RC7a 10/15 / X | 120 97 | 23 
Plates | y | 120 104 | 16 
7 | 160 147 | 13 
Sub-commission IV:3 (Rentrew) 
In July 1960 the IV:3-report (the May issue 1960 of the Canadian Surveyor) was received by IV:4 
and comparisons between the results of IV:3 (checks from geodetic measurements) and IV:4 (checks 
from residual y-parallaxes) could be made.