REESE EIE Lu MEI AMORES A 
Scheduled for July 20, Working Group IV/3 
"Large-Scale Numerical Photogrammetry” 
chaired by Mr. U. van Twembeke (Belgium). 
3. July 20, 1976, at 10.00: Resolutions Committee 
of Commission IV chaired by Mr. G. Ducher 
(France). 
4. July 21, 1976, at 15.00: Working Group IV/1 
"Applications of Digital Terrain Models (D.T.M.)" 
presided by Dr. C. Ternryd (Sweden). 
All these sessions would take place in the meet- 
ing room reserved for Commission IV (Hall L 4). 
After this brief review of the congress timetable 
of Commission IV, the meeting proceeded to 
update the list of panelists for the various Tech- 
nical Sessions, Furthermore, some suggestions 
were made concerning the resolutions of the 
Commission and its future Working Groups, 
including a redefinition of the fields to be covered 
by these groups. 
Dr. Ternryd requested that all Presented Papers 
related to the work of WG IV/1 be announced at 
the Technical Session of July 22. 
The following volunteered to participate in the 
work of the Resolutions Committee of Com- 
mission IV: 
Dr. J. Zarzycki (Canada) 
Colonel M. Datta (India) 
Mr. U. van Twembeke (Belgium). 
With respect to the future work of WG IV/1, deal- 
ing with applications of photogrammetry and 
D.T.M. to highway and railway design, Dr. Ternryd 
said the following: "WG IV/1 should not continue 
its work during the following intercongress 
period. The field now including D.T.M. and semi- 
automated techniques should be enlarged to 
cover areas outside highway and railway design. 
The application of photogrammetry to road con- 
struction projects is to be considered a classical 
application from now on, after a lapse of sixteen 
years. 
Wednesday, July 14, 1976, from 10.45 to 12.15 
Session 2 of Commission IV 
Topic: Various Reports 
Chairman: Mr. G. Ducher (France) 
Invited Papers 
Author: Mr. G. Ducher (France) 
Title: Report on Commission IV Activities 
1972— 1976 CR IV/01 
Author: Mr. A. Belbachir (Morocco) 
Title: Report on the State of the Use of 
Orthophotography in the World /P 
1V/06 
These two papers were followed by a general 
discussion, in the course of which the following 
observations were made. 
Mr. J. Visser (Netherlands) said he would like to 
return to point four of Mr. Belbachir's presenta- 
tion, according to which the reproduction of pho- 
tomaps would be possible in only three ways: 
a) photography 
b) rastered diazotized copy 
C) raster offset. 
He continued by observing that this could ex- 
plain why no answer had been given by the 
United States at this point, as they use the 
random dot technique. He wished to ask the 
RT ee p erar rp rpg PN ete rey EP ET pet pt cum Pet rtt 
U.S.G.S. to explain in what respects this method 
was superior to the classical printing method, 
the finely rastered offset. 
In answer to Mr. Visser, Mr. M. Thompson (U.S.A.) 
stated that the U.S.G.S. considers the quality of 
print of its photomaps as one of its foremost 
problems. He said the U.S.G.S. had not yet re- 
ached a final solution in developing a suitable 
process, but that a technical laboratory had been 
established for continued image research in this 
area. 
Dr. M. Erez (Israel) said experiments in ortho- 
photo reproduction had been carried out at the 
Survey Department of Israel. He mentioned that 
a few examples where the raster technique was 
compared with the random dot technique were 
exhibited in the National Members' Exhibition at 
the Congress. He said that the random dot tech- 
nique used in Israel was a variant of the one 
used at the U.S.G.S. He suggested that a thread 
counter be used in examining the results. 
Mr. T. Krimly (Saudi-Arabia) said he was sure that 
Mr. Belbachir had done his best, but wondered 
whether Saudi-Arabia had been consulted at all 
in the course of his research. As a matter of fact, 
Saudi-Arabia made intensive üse of orthophoto- 
maps. Twenty-four leafs at a scale of 1:50000, in 
five colors, had been produced since 1972. 300 
leafs at a scale of 1:50000 (or 1:10000) were 
being systematically produced. The image quality 
had been sufficiently improved. In the meanwhile, 
research was being carried out on other aspects 
of the problem. 
Mr. A. Sbai (Morocco) closed the discussion by 
answering that it would have been impossible to 
consult all countries, unfortunately. The list given 
in the report itself included those countries for 
which international organizations had given the 
addresses of national societies of photogram- 
metry. As to the techniques of orthophoto 
reproduction, Mr. Sbai asked the 1.S.P. to publish 
a description of the methods and results which 
had been mentioned in the course of this session. 
Presented Papers 
Author: Mr. J. Timmerman (Netherlands) 
Title: Report of the Commission C 
"OEEPE-Dordrecht" Experiment 
PP 1V/36 
The specific aim of this experiment was the 
determination of the accuracy with which some 
elements of buildings could be measured in a 
photogrammetric model. 
At the close of this presentation, Mr. J. Visser 
(Netherlands) made it clear that Mr. Timmerman 
was not President of Commission C of OEEPE, 
but that he chaired one of its working groups. 
The President of the Commission is Mr. Fórstner. 
Author: Dr. W. Beck (F.R.G.) 
Title: Rapport de la Commission D de 
l'OEEPE sur l'établissement de car- 
tes topographiques au 1/10000 selon 
le procédé photogrammétrique PP 
1V/03 
Presented by Dr. F. Ackermann 
(F.R.G.) 
Dr. B. Dubuisson (France) said the results dem- 
onstrating the usefulness of orthophotography 
107