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PHOTO INTERPRETATION PICTURE, DISCUSSION 115
The PRESIDENT: This question certainly will
not be settled in this session, but it has given us
much food for thought.
There are three members of the panel who
have not spoken, before we go further I would
like to see if they have any comments to make
either on the paper or on some of the questions
that have been raised.
Lt-Col. N. E. GREEN: I do not believe I have
anything particular to add. I have a very great
interest in this problem of the human factor in
photo interpretation. There is an increasing
amount of interest in this and an increasing
amount of work in psychological aspects. After
all, photographic interpretation is a human
factor problem in itself. I would like to be able
to give some references — perhaps I may be able
to do before the week is out — as to certain
studies on the psychological aspects that are
being undertaken now, I know that the Air
Force is interested in this and that there is some
work going on in testing for photo interpreters.
I hope that I will be able to get some more
specific references which I might be able to
make available.
Mr D. A. Boon: If I may answer the question
posed by Mr Olson, I think the best answer
would be, that special in forest inventory the
best results can only be obtained in a sound
combination between photo interpretation and
statistical work. Perhaps in the coming dis-
cussion within the vegetation session, this par-
ticular subject will obtain more profound con-
sideration.
Capt R. V. A. THORÉN: I agree with the other
speakers and their viewpoints. A photo inter-
preter ought to have a common knowledge of
as many different subjects as possible related to
his special commission. He has to operate and
Archives 6
--.
use all kinds of pictures: verticals, obliques and
ground photos as well. His elementary training
will give him a first idea of identification cf the
subject he is finding in the pictures, and by
measuring the details he has analysed he will get
a clear view of what the picture is able to present
to him. In that way PI for an avid interpreter
is always measuring work; he goes on measuring
the details mostly in single photos. Perhaps the
most difficult problem in photogrammetry is
working with single photos. If he is trained
enough, he will be able to measure millimetres
of dimensions. In that way you will be able to
follow the development of equipment in the
different branches. It may be aboard ships or on
shore. He will be able to follow the development
of the last electronic equipment of topical in-
terest for his branch, wherever he is working.
He will be able to state the frequency band used
and I suppose that will be of topical interest and
of special value for the service to which he be-
longs. That is advanced work for the photo
interpreters. Of course, he must be trained for
that; it will go on day and night perhaps year
after year. If I had been asked ten years ago to
state the frequency band used in a radar set, I
would have laughed and said that it was im-
possible, but it is now possible and nothing may
be hidden in that way if you are sufficiently
trained.
The PRESIDENT: Our time is fully gone. I
would again remind you that each of the
gentlemen here on the platform will have a sub-
sequent session in his own working group and
his own speciality. I cordially invite you to go to
these subsequent sessions.
I think the discussion here has been a very
good beginning for Commission VII pro-
gramme. The Meeting is now adjourned.
