REPORT OF TRIP TO(Sanitized) ON 19 JANUARY 1965

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000700040094-9
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: October 28, 2004
• Sequence Number: 94
• Publication Date: March 2, 1965
• Content Type: MF

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MEMORANDUM FOR:
Chief, CIA/PID (NPIC)
FROM :
Chief, OSS/PID (WIC)
SUBJECT :
Report of Trip to
5n
25 1
19 January 1965
1, In discussions wila ef the Plans and Development Staff,
lof DDSSO, anal of NRO, on 9 January 1965 it WRII
decided that as part of the Dimview project an attempt should be made to
determine by mid March of 1965 the optimum stereo convergence angle
throughout the range of practical obliquity angles for a new camera zystem.
Discussions were held on various techniques for obtaining the answer to
this question and a decision was made to use a scale model prepared by
the ,lend to make photographs of this scale model at the
l
various stereo convergence and obliquity angles to be studied.
3. In the I I facilities we discussed with these gentlemen the
problem at hand and various ways of attaining the type of photography
we required for our testing. We indicated to them that the convergeece
angles in question were as follows; ten degrees, 15 degrees, 20 degrees,
25 degrees, and 30 degrees. We were interested in these convergence
angles at the following obliquities 0 degrees, 10 degrees, 20 degrees,
30 degrees, 45 degrees and 60 degrees, Since the method which will
utilize this material 4111 be determining PI preferences by a pair
comparison or ranking technique, it is not essential that the angles be
precisely obtained. We indicated that tolerances plus or minus 3 degrees
would be entirely sufficient for our purposes.
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19 January 1965
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4. After initial discussions e went with the personnel to
view the model, which Is housed in an old theater in down town-Lexiserben.
The model is presently 8 by 8 feet on a side and situated on a 16 foot
diameter turnetable located in a center of the stage of the theater. The
proscenium has been covered with polyethylene film strung between 2 X los
in order to conserve heat in the building since only the stage area with
the model is heated. About 55 feet directly above the stage is a fly grid
made up of wooden strips several inches apart over what used to be the
audience area of the theater. The ceiling is 33 feet above the floor of
the stage (see attachment A). A sies2leted sun is available on a cat walk
approximately 30 feet high at the side of the stage. On a number of light
bare situated above and all around the model are a series of auxiliary
lamps to accurately simulate the effects of sky lighting.
5. W taied with the artist 'who has been constructing the model and
with the engineers, and node a number of suggestions to increase the
realism of the model. These included textural changes in earthen areas
and the toning down of the reflectivity of vehicles railread tracks and
other objects. I suggested that the photographing of the model be meda
with three different rotations so that cross comparisons could be noel
during the testing phase to determine any effects of target angularity on
the results. This would be accomplished by rotating the model between the
successive photographs. The combination of rotational changes, sun changes,
and obliquity and convergence factors are shown on a table in attachment B.
The rotation of the model is shown by the Greek letters Alpha, Beta, Delta,
and Gamma. The obliquities by Roman Numerals I through VI, and the
convergence angles by letters A through F. Because of the difference in
altitude when photographing from directly above the model and photographing
from 30 degrees to 60 degrees two different focal length lenses were used
on the 35 millimeter eemera 4king the pictures. We asked that the completed
photographs be placed between one by three inch microscope slides ant the
surounding areas opafued.
6. The resulting photography would attempt to simulate satillite
t a scale of 1 to 100,000 at nadir with a ground resolution
Do to limitations on the film and louse combinations available
cided o melte this simulation at a five to One retick using e Scale
five times larger and a film with a granularity approximately five times
larger than the 44o4 film. Since the 4404 file has a granularity of .023 it
was felt that a film such as Super XX with a granularity of .10 could be used.
This five to one scale increase will also simplify the testing procedure and
allow the use of standard I IZoon microscopes since their resolution
capability would preclude their use at the higher resolution limits.
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7. An approximate idea of the model content is shown by the
photographs in attachment CO Shown here are a stereo pair taken from the
balcony of the theater with a Leica eamera, a color photograph of a section
of the model and a vertical photograph of three quarters Of the model. The
quality of the resulting photographs from the present experiment will be
greater than the black and white photographs shown in this attachment.
8. The validity of using a model such as this to determine photographic
perimeters for camera systems has not, of course, been proved. There. will
be some who feel that real photography should have been used and that valid
conclusions cannot be drawn from photographs of a model. My personal
feelings on this matter are: First, thst this is an extremely realistic
model with detail existing far down into the area below the resolution
capability of the photography. This is one factor that will tend to provide
more realism. Second, the initial preblem laid uponI
was to come up with an answer to the stereo obliquity
question by Whatever means they deemed best in the time specified. With
this restriction laid upon them I feel that we must trust their judgement
as to the validity of this method. Prelianary discussions with ther have
indicated that they feel that it will yield acceptable results. At a
later date comparisons may be made by testing against real material and
should the validity of the model procedure be proved, this technique will
nave much valuable time and expense in future studies of this type. I
foresee oily one possible factor which may tend to bias the results, this
is in the decreased area covered by the photography when the model is
photographed at oblique angles. In testing by the method of pair comparisons
the subject is given a pair of vertical photographs and a pair of oblique
photographs and asked his preference. Using real photography this oblique
photographs would off net the loss of scale factor by an increased ground
area factor. Using model photography the ratio of scale factor in going
from a vertical to an oblique is realistic, however, the area coveree on
the film by the model is decreased proportionately. Whether or not this
factor will bias the results remains to be seen. 1 have discussed this
with and he feels that it is not a significant factor but that
they will take it into consideration.
3 Attachments:.
Distribution:
Orig. - Addressee
1 . OSS Chrono
1 . OBS Subject
O'J
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