AUTOMATION IN PHOTOGRAMMETRY, DISCUSSION 
Discussion 
Mr ESTEN reads his paper “Great Expecta- 
tions” and then he asks Mr Blachut to present 
his paper “Automatic Plotting in Small- and 
Large-Scale Mapping”. 
Since this presentation covers essentially the 
main points of the paper, which is inserted in 
this part of the Archives, it will not be repeated 
here. 
Mr R. D. EsrEN: We will have five minutes 
of questions at this time, and if the questions 
run on longer we will go past the noon hour, 
but we will take only five minutes now so that 
we can hear the other members of the panel 
after that time. 
Mr A. L. NOWICKI: May I ask Mr Blachut if 
they have made any tests on areas which had a 
larger slope than the 20 degrees of the Renfrew 
area? If so, is there any physical limitation at 
present to the slope that this instrument will 
raise? 
Mr T. J. BLACHUT: I think this is a question 
to which Mr Hobrough ought to give the answer, 
but the greatest slope we used in our tests was 
30 per cent. Perhaps Mr Hobrough would like 
to say something. 
Mr HoBRoUGH: There is a limit to the slope 
that the Stereomat can handle. At the present 
time at about 20 degrees above horizontal the 
operation becomes rather erratic. This could 
probably be corrected in our next instrument 
by the use of a more complex scanning operation 
using two cathode ray tubes. In this way the 
effective pattern can be made to assume angle 
space and it would automatically become 
tangent to the terrain surface. The difficulty with 
the slope is that as the slope increases more of 
the pattern is removed from the surface of the 
terrain and less of the area of the scanning 
pattern is available for correlation purposes. As 
the plate is tilted to a tangency with the terrain 
Archives 4 
this correlation area would increase. Does that 
explain it enough for you? 
Mr R. D. EsTEN: Our next speaker will be 
Mr Roland Moore of the United States 
Geological Survey. His paper is on the 1960 
Orthophotoscope, and it has been published and 
distributed here at the Congress. 
Mr MOORE sums up the main points of his 
paper. 
Mr R. D. EsTEN: Thank you very much, Mr 
Moore. Our next speaker will be Mr Joseph 
Diello from the Rome Air Development Centre, 
United States Air Force. Mr Diello's paper is on 
"The Electronic Photogrammetric Rectifier", it 
has been published and will be distributed here 
at the Congress at a later date. 
Mr DIELLO gives a short review of the con- 
tents of his paper. 
Mr R. D. EsTEN: Thank you, Mr Diello, I 
am sure we will all be interested in getting copies 
of this paper so thai we can examine it in more 
detail. 
Our last speaker is one who has long been 
associated with the problems of automation in 
photogrammetry and this is Mr William C. 
Cude. Mr Cude is presently associated with the 
United States Army Engineer Research and 
Development Laboratories, located at Fort 
Belvoir, Virginia. 
Mr CUDE gives a review of the contents of his 
paper. 
The PRESIDENT: There is still time for dis- 
cussion and now Mr Esten will ask if there are 
any questions. 
Mr R. D. ESTEN: Are there any questions to 
be put to the members of the panel? 
There are no questions; the President closes 
the session.